Updated on 2024/09/13

Information

 

写真a

 
TODA HIROYUKI
 
Organization
Faculty of Engineering Department of Mechanical Engineering Professor
Research Center for Synchrotron Light Applications (Joint Appointment)
School of Engineering (Joint Appointment)
Graduate School of Engineering Department of Mechanical Engineering(Joint Appointment)
Graduate School of Integrated Frontier Sciences Department of Automotive Science(Joint Appointment)
Title
Professor
Contact information
メールアドレス
Tel
0928023246
Profile
I have lead a research group exploring materials strength and characterisation in 3D/4D. My research is in the field of deformation, fracture and fatigue on a wide range of structural/functional materials. A major focus is the exploration of the microstructure and the microstructure-property relations of such materials utilizing synchrotron X-ray microtomography at the third generation facilities, in particular the development of advanced 3D/4D measurements of stress/strain, crack-driving forces, chemical composition and crystallographic information in high density together with their applications to various issues in materials and mechanical engineerings. Recently we have proposed a new concept entitled "Reverse 4D Materials Engineering", in which the complex morphologies of existing materials is taken into account to realize a paradigm shift in materials development for structural/functional materials. We are also in charge of the development of new innovative aerospace materials that is based on a real fracture behavior that has been achiebved by applying the above-mentioned techniques.
Homepage
External link

Degree

  • Doctor of Engineering

Research History

  • 鈴木自動車工業株式会社 技術研究所

    鈴木自動車工業株式会社 技術研究所

  • 豊橋技術科学大学 大学院工学研究科 機械工学専攻 教授

Research Interests・Research Keywords

  • Research theme:3D / 4D multi-scale / multi-modal materials science developed by ultra high resolution X-ray microscope

    Keyword:Synchrotron radiation, Microtomography, Mechanical properties, Structural materials, Imaging CT, X-ray microscopy

    Research period: 2021.4 - 2024.3

  • Research theme:Half-spontaneous interfacial debonding: Tomography bridging nano and macro scales

    Keyword:Synchrotron radiation, Micro・nanotomography, Hydrogen embrittlement, Aluminum, First principles somulation, Hydrogen partitioning

    Research period: 2019.10 - 2025.3

  • Research theme:3D / 4D mesoscale materials science developed by ultrahigh magnification X-ray microscope

    Keyword:Synchrotron radiation, Microtomography, Mechanical properties, Structural materials, Imaging CT, X-ray microscopy

    Research period: 2017.4 - 2020.3

  • Research theme:Optimisation of microstructures in aluminium alloys via hydrogen partitioning control

    Keyword:Synchrotron radiation, Microtomography, Mechanical properties, Hydrogen trapping, Hydrogen embrittlement, Pore, Tracking, Strain, Mapping, Aluminum alloys

    Research period: 2014.9 - 2020.3

  • Research theme:Science of fatigue and fracture: Three-dimensional analyses of crack-tip using synchrotron radiation

    Keyword:Synchrotron radiation, Microtomography, fatigue fracture, Tracking, Strain, Crack driving force, Mapping, Titanium alloys

    Research period: 2014.8 - 2019.3

  • Research theme:A New Concept Breakthrough in Materials Development: Reverse 4D Materials Engineering

    Keyword:Synchrotron radiation, Microtomography, Mechanical properties, Structural materials, Optimization, Coarsening, Image-based simulation

    Research period: 2012.4 - 2017.3

  • Research theme:Development of new innovative aerospace materials

    Keyword:Synchrotron radiation, Microtomography, Mechanical properties, Structural materials, Hydrogen, Pore, 3D/4D analyses

    Research period: 2012.4

  • Research theme:Crystallographic deformation behaviors of polycrystalline materials

    Keyword:Synchrotron radiation, Microtomography, X-ray difffraction, Polycrystalline materials, Crystallographic orientation, Deformation, Fracture, Damage, Structural materials

    Research period: 2008.4

  • Research theme:Image-based analyses in 3D/4D and their application to structural materials

    Keyword:Synchrotron radiation, Microtomography, Mechanical properties, Structural materials, Tracking, Strain, Chemical concentration, Crack driving force, Mapping, Steels, Aluminum alloys

    Research period: 2001.9

Awards

  • 日本金属学会 金属組織写真賞最優秀賞 第4部門(顕微鏡関連部門)

    2024.3   日本金属学会  

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    表題:『Al-Zn-Mg 合金における水素脆化発生挙動のマルチモーダル3Dイメージベース解析』(比嘉良太,藤原比呂,戸田裕之,小林正和,海老原健一,竹内晃久)

  • 令和5年度日刊工業新聞社賞

    2023.11   日刊工業新聞社  

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    受賞論文 「Suppression of Hydrogen Embrittlement due to Local Partitioning of Hydrogen to Dispersed Intermetallic Compound Particles in Al–Zn–Mg–Cu Alloys」
    (Materials Transactions, Vol. 63,No.10 (2022), 1406-1415)

  • 令和5年度軽金属論文賞

    2023.11   一般社団法人軽金属学会  

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    受賞論文「Suppression of Hydrogen Embrittlement due to Local Partitioning of Hydrogen to Dispersed Intermetallic Compound Particles in Al–Zn–Mg–Cu Alloys」(Materials Transactions, Vol. 63,No.10 (2022), 1406-1415)

  • 日本金属学会 第62回谷川ハリス賞

    2023.3   日本金属学会  

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    日本金属学会第62回谷川ハリス賞:『構造材料の3D/4D損傷・破壊挙動とその制御』(受賞日:令和5年3月8日)

  • 軽金属学会70周年記念九州支部功労賞

    2021.12   軽金属学会 九州支部  

  • 軽金属学会70周年記念功労賞

    2021.11   軽金属学会  

  • 日本金属学会 金属組織写真賞最優秀賞 第3部門(透過電子顕微鏡部門)

    2021.3   日本金属学会  

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    表題:『Al-Zn-Mg-Cu合金における結晶粒界無析出物帯中の溶質クラスタ』(松田健二, 安元透, Bendo Artenis, 土屋大樹, 李昇原, 西村克彦, 布村紀男, Marioara Calin, Lervik Adrian, Holmestad Randi, 戸田裕之, 山口正剛, 池田賢一, 本間智之, 池野進)

  • 令和2年度日刊工業新聞社賞

    2020.11   日刊工業新聞社  

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    論文名:『Effect of Copper Addition on Precipitation Behavior near Grain Boundary in Al–Zn–Mg Alloy』(K. Matsuda, T. Yasumoto, A. Bendo, T. Tsuchiya, S. Lee, K. Nishimura, N. Nunomura, C. D. Marioara, A. Levik, R. Holmestad, H. Toda, M. Yamaguchi, K. Ikeda, T. Homma, S. Ikeno)

  • 本多フロンティア賞

    2020.11   公益財団法人本多記念会  

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    理工学特に金属材料などの無機材料、有機材料及びこれらの複合材料の3分野のいずれかの分野に関する研究を行い、学術面あるいは技術面において画期的な発見又は発明を行った者に対して贈られる記念賞。受賞名:『シンクロトロン放射光CTを利用した3D/4D材料科学の創成』。賞金:50万円が贈られる。

  • 令和2年度軽金属論文賞

    2020.11   軽金属学会  

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    受賞論文名:「Effect of Copper Addition on Precipitation Behavior near Grain Boundary in Al–Zn–Mg Alloy」。CRESTプロジェクト(研究代表者:戸田裕之)の成果を国内学会の英文誌に投稿したもの。高分解能TEMやHAADF-STEMといった技法を用い、アルミニウム合金でCuを添加した場合の優れた力学的性質の起源を明らかにした。Cu添加による時効析出物の増加が強度向上や延性低下をもたらすが、それを原子分解能電顕観察で評価し、粒界に沿うナノメートルレベルの無析出物帯の存在や時効析出物の結晶構造の同定などが可能になった。

  • 第17回軽金属功績賞

    2019.5   軽金属学会  

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    軽金属学会の学術賞である功績賞の受賞

  • 平成28年度 研究活動表彰

    2016.12   九州大学  

  • 平成28年度 日本金属学会第64回論文賞 力学特性部門

    2016.9   日本金属学会  

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    論文名:『Application of diffraction-amalgamated grain boundary tracking to fatigue crack propagation behavior in high strength aluminum alloy』(H. Li, H. Toda, K. Uesugi, A. Takeuchi, Y. Suzuki and M. Kobayashi)

  • 平成27年度 日刊工業新聞社賞

    2015.11   日刊工業新聞社  

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    論文名:『放射光三次元計測した局所ひずみに基づくアルミニウム合金の変形集合組織形成シミュレーション』(河野亜耶,小林正和,戸田裕之,三浦博己)

  • 平成27年度 軽金属論文賞

    2015.11   軽金属学会  

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    表題:「放射光三次元計測した局所ひずみに基づくアルミニウム合金の変形集合組織形成シミュレーション」(河野亜耶,小林正和,戸田裕之,三浦博己)

  • 平成27年度 日本鋳造工学会 論文賞

    2015.5   日本鋳造工学会  

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    表題:「高分解能4Dイメージングによる球状黒鉛鋳鉄の疲労挙動解析」(清水一行,戸田裕之,J.-Y. Buffiere, J. Lachambre,上杉健太朗,小林正和)

  • 平成27年度科学技術分野の文部科学大臣表彰科学技術賞(研究部門)

    2015.4   文部科学省  

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    表題「構造材料の3D/4Dイメージベース解析に関する研究」
    科学技術に関する研究開発、理解増進等において顕著な成果を収めた者について、その功績を讃えることにより、科学技術に携わる者の意欲の向上を図り、もって我が国の科学技術水準の向上に寄与することを目的とする科学技術分野の文部科学大臣表彰の賞。

  • Best Paper Prize

    2015.3   International Journal of Cast Metals Research (IJCMR)  

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    論文名:『Formation behaviour of blister in cast aluminium alloy』(H. Toda, P. C. Qu, S. Ito, K. Shimizu, K. Uesugi, A. Takeuchi, Y. Suzuki, M. Kobayashi)

  • 平成27年度 研究活動表彰

    2015.1   九州大学  

  • 平成26年度 日本鉄鋼協会 西山記念賞

    2014.3   日本鉄鋼協会  

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    表題:『鉄鋼の3D/4Dイメージングとその応用』

  • 平成25年度 日刊工業新聞社賞

    2013.11   日刊工業新聞社  

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    論文名:『アルミニウム合金のせん断帯における3D/4D破壊力学的評価』(清水一行,坂口祐二,酒井一憲,戸田裕之,上杉健太朗,竹内晃久,小林正和)

  • 平成25年度 軽金属学会論文賞

    2013.11   軽金属学会  

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    論文名:『アルミニウム合金のせん断帯における3D/4D破壊力学的評価』(清水一行,坂口祐二,酒井一憲,戸田裕之,上杉健太朗,竹内晃久,小林正和)

  • 平成24年度 第30回永井科学技術財団賞

    2013.3   永井科学技術財団  

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    表題:『3D/4Dイメージングによる構造用素 材の機械的性質・信頼性』

  • Visual-JW2012, Best Paper Award

    2012.11   Visual-JW2012 (The International Symposium on Visualization in Joining & Welding Science through Advanced Measurements and Simulation, and 2nd International Workshop "In-situ Studies with Photons, Neutrons and Electrons Scattering" in conjun  

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    論文名:『Assessment of fatigue crack propagation behavior in aluminum alloy by in-situ high-resolution synchrotron X-ray microtomography』(H. Li, H. Toda, Y. Mizuseki, K. Uesugi, A. Takeuchi, Y. Suzuki and M. Kobayashi)

  • 平成23年度 日本金属学会第59回論文賞

    2011.11   日本金属学会  

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    論文名:『Four-Dimensional Annihilation Behaviors of Micro Pores during Surface Cold Working』(H. Toda, T. Yamaguchi, M. Nakazawa, Y. Aoki, K. Uesugi, Y. Suzuki and M. Kobayashi)

  • 平成23年度 軽金属学会六十周年記念学術功績賞

    2011.11   軽金属学会  

  • 平成22年度 日本鋳造工学会 論文賞

    2010.5   日本鋳造工学会  

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    論文名:『熱処理したアルミニウム合金ダイカストで新たに見つかった鋳肌欠陥とその疲労特性への影響』(増田翔太郎,戸田裕之,青山俊三,折井晋,植田将志,小林正和)

  • 平成20年度 日本金属学会 金属組織写真賞 B部門優秀賞

    2009.3   日本金属学会  

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    表題:『K吸収端差分イメージングによる3D元素濃度マッピング』(清水一行,戸田裕之,上杉健太朗,鈴木芳生)

  • 平成20年度 日本金属学会 金属組織写真賞 A部門優秀賞

    2009.3   日本金属学会  

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    表題:『粒界粒子の追跡による多結晶材料の4D変形挙動解析』(大川嘉一,小林正和,戸田裕之,上杉健太朗,鈴木芳生)

  • The 11th World Conference on Titanium (JIMIC5), Best Poster Presentation Award

    2007.6   The 11th World Conference on Titanium (JIMIC5)  

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    論文名:『Development of Fabrication Process of Porous Titanium and Polymethylmethacrylate (PMMA) Composite Biomaterial』(M. Nakai, M. Niinomi, T. Akahori, Y. Shinozaki, H. Toda, S. Itsuno, N. Haraguchi, Y. Itoh, T. Ogasawara and T. Onishi)

  • 平成19年度 日本金属学会第65回功績賞 工業材料部門

    2007.3   日本金属学会  

  • 平成18年度 日本鋳造工学会 小林賞

    2006.5   日本鋳造工学会  

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    論文名:『Assessment of Thermo-Mechanical Fatigue Behaviors of Cast Al-Si Alloys by Experiments and Multi-Step Numerical Simulation』(H.Toda, J.Katano, T.Kobayashi, T.Akahori and M.Niinomi)

  • 平成17年度 日本金属学会第56回金属組織写真賞 B部門佳作賞

    2006.3   日本金属学会  

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    表題:『Al-Si 系鋳造合金の結晶粒界および共晶部 Si 粒子の三次元観察』(小林正和,上杉健太朗,戸田裕之,大垣智巳,小林俊郎)

  • 2006 International Metallographic Contest (Class 11: Digital Microscopy), Second Place

    2006.1   The International Metallographic Society  

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    表題:『Cast A356 Aluminum Alloy』(M. Kobayashi, K. Uesugi, H. Toda, T. Ohgaki, T. Kobayashi: )

  • 平成17年度 日刊工業新聞社賞

    2005.11   日刊工業新聞社  

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    論文名:『強加工in-situ複合材料技術を利用した金属切削粉のアップグレードリサイクル』

  • 平成17年度 軽金属学会論文賞

    2005.11   軽金属学会  

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    論文名:『強加工in-situ複合材料技術を利用した金属切削粉のアップグレードリサイクル』(戸田裕之,澤村純平,小林俊郎)

  • The Science Direct TOP25 Hottest Articles

    2005.5   Science Direct  

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    論文名:『Corrosion resistance and biocompatibility of Ti-Ta alloys for biomedical applications』 (Y.L. Zhou, M. Niinomi, T. Akahori, H. Fukui, H. Toda) Materials Science and Engineering A, Volume 398, Issue 1-2, Pages 28-36, 1 May 2005,

  • 平成16年度 軽金属学会躍進賞

    2004.11   軽金属学会  

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    躍進賞

  • TOP PAPERS 2004

    2004.10   Journal of Physics: Condensed Matter  

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    論文名:『In-situ high resolution synchrotron X-ray tomography of crack closure micromechanisms』 (K. H. Khor, H. Toda, J.-Y. Buffiére, W. Ludwig, H. S. Ubhi, P. J. Gregson, I. Sinclair)

  • 平成13年度 日本材料学会学術奨励賞

    2002.5   日本材料学会  

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    標題:『各種金属材料、複合材料の強靱化および疲労特性の向上に関する研究』

  • 平成13年度 日刊工業新聞社賞

    2001.11   日刊工業新聞社  

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    論文名:『6082合金溶接材の各部の破壊靭性』

  • 平成13年度 軽金属学会論文賞

    2001.11   軽金属学会  

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    論文名:『6082合金溶接材の各部の破壊靭性』(戸田裕之, 水谷道, 高橋明宏, 小林俊郎, Mosneaga Victor ALEXANDRU)

  • 平成12年度 日本材料学会 第30回記念FRPシンポジウム奨励賞

    2001.3   日本材料学会  

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    標題:『形状記憶合金粒子の分散による金属材料の耐衝撃破壊抵抗改善の試み』

  • 軽金属学会第16回軽金属奨励賞

    1998.10   軽金属学会  

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    表題:『変形・破壊シミュレーションに基づく先進アルミニウム合金基複合材料の強靱化』

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Papers

  • Stress corrosion cracking induced by the combination of external and internal hydrogen in Al-Zn-Mg-Cu alloy Reviewed International journal

    J. Tang, Y. Wang, H. Fujihara, K. Shimizu, K. Hirayama, K. Ebihara, A. Takeuchi, M.Uesugi, H. Toda

    Scripta Materialia   Vol.239 ( 115804 )   2024.1

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.scriptamat.2023.115804

    Repository Public URL: https://hdl.handle.net/2324/7162033

  • Surrogate-based optimization of microstructural features of structural materials Reviewed International journal

    H. Toda, H. Li, R. Batres, K. Hirayama, H. Fujihara

    Acta Materialia   257   2023.9

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.actamat.2023.119188

    Repository Public URL: https://hdl.handle.net/2324/7157956

  • Switching nanoprecipitates to resist hydrogen embrittlement in high-strength aluminum alloys Reviewed International journal

    Y. Wang, B. Sharma, Y. Xu, K. Shimizu, H. Fujihara, K. Hirayama, A. Takeuchi, M. Uesugi, G. Cheng, H. Toda

    Nature Communications   13 ( 1 )   2022.11

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1038/s41467-022-34628-4

    Repository Public URL: https://hdl.handle.net/2324/6792836

  • Suppressed hydrogen embrittlement of high-strength Al alloys by Mn-rich intermetallic compound particles Reviewed International journal

    Y. Xu, H. Toda, K. Shimizu, Y. Wang, B. Gault, W. Li, K. Hirayama, H. Fujihara, X. Jin, A. Takeuchi, M. Uesugi

    Acta Materialia   236   2022.9

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.actamat.2022.118110

    Repository Public URL: https://hdl.handle.net/2324/6792843

  • Multimodal assessment of mechanically induced transformation in metastable multi‐phase steel using X‐ray nano‐tomography and pencil‐beam diffraction tomography Reviewed International journal

    H.Toda, K. Hirayama, K. Okamura, T. Suzuki, A. Takeuchi, M. Uesugi, H. Fujihara

    Acta Materialia   234   2022.8

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.actamat.2022.117956

    Repository Public URL: https://hdl.handle.net/2324/6792831

  • In-situ 3D observation of hydrogen-assisted particle damage behavior in 7075 Al alloy by synchrotron X-ray tomography Reviewed International journal

    Y. Wang, H. Toda, Y. Xu, K. Shimizu, K. Hirayama, H. Fujihara, A. Takeuchi, M. Uesugi

    Acta Materialia   227   2022.2

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.actamat.2022.117658

    Repository Public URL: https://hdl.handle.net/2324/6792838

  • Damage micromechanisms of stress corrosion cracking in Al-Mg alloy with high magnesium content Reviewed International journal

    K. Hirayama, H. Toda, D. Fu, R. Masunaga, H. Su, K. Shimizu, A. Takeuchi and M. Uesugi

    Corrosion Science   184   2021.5

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    Language:English  

    DOI: 10.1016/j.corsci.2021.109343

    Repository Public URL: http://hdl.handle.net/2324/4483199

  • Hydrogen-accelerated spontaneous microcracking in high-strength aluminium alloys Reviewed International journal

    T. Tsuru, K. Shimizu, M. Yamaguchi, M. Itakura, K. Ebihara, A. Bendo, K. Matsuda, H. Toda

    Scientific Reports   10 ( 1 )   1998 - 1998   2020.4

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    Language:English   Publishing type:Research paper (scientific journal)  

    Hydrogen-accelerated spontaneous microcracking in high-strength aluminium alloys
    Aluminium alloys are re-evaluated as most feasible way to satisfy the industrial needs of light-weight structural materials. However, unlike conventional structural metals such as iron and titanium, aluminium does not have easily accessible secondary phases, which means that aluminium-based alloys cannot be strengthened by harnessing multiple phases. This leaves age hardening as the only feasible strengthening approach. Highly concentrated precipitates generated by age hardening generally play a dominant role in shaping the mechanical properties of aluminium alloys. In such precipitates, it is commonly believed that the coherent interface between the matrix and precipitate does not contribute to crack initiation and embrittlement. Here, we show that this is not the case. We report an unexpected spontaneous fracture process associated with hydrogen embrittlement. The origin of this quasi-cleavage fracture involves hydrogen partitioning, which we comprehensively investigate through experiment, theory and first-principles calculations. Despite completely coherent interface, we show that the aluminium-precipitate interface is a more preferable trap site than void, dislocation and grain boundary. The cohesivity of the interface deteriorates significantly with increasing occupancy, while hydrogen atoms are stably trapped up to an extremely high occupancy over the possible trap site. Our insights indicate that controlling the hydrogen distribution plays a key role to design further high-strength and high-toughness aluminium alloys.

    DOI: 10.1038/s41598-020-58834-6

  • Assessment of hydrogen embrittlement via image-based techniques in Al-Zn-Mg-Cu aluminum alloys Reviewed

    H. Su, H. Toda, K. Shimizu, K. Uesugi, A. Takeuchi, Y. Watanabe

    Acta Materialia   176   96 - 108   2019.9

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    Language:English   Publishing type:Research paper (scientific journal)  

    Assessment of hydrogen embrittlement via image-based techniques in Al-Zn-Mg-Cu aluminum alloys

    DOI: 10.1016/j.actamat.2019.06.056

    Repository Public URL: http://hdl.handle.net/2324/4149932

  • Influence of hydrogen on strain localization and fracture behavior in Al Zn Mg Cu aluminum alloys Reviewed

    Hang Su, Hiroyuki Toda, Ryohei Masunaga, Kazuyuki Shimizu, Hongye Gao, Katsuro Sasaki, Md Shahnewaz Bhuiyan, Kentaro Uesugi, Akihisa Takeuchi, Yoshio Watanabe

    Acta Materialia   159   332 - 343   2018.10

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    DOI: 10.1016/j.actamat.2018.08.024

  • Damage micromechanisms in dual-phase steel investigated with combined phase- and absorption-contrast tomography Reviewed

    Hiroyuki Toda, Akihide Takijiri, Masafumi Azuma, Shohei Yabu, Kunio Hayashi, Dowon Seo, Masakazu Kobayashi, Kyosuke Hirayama, Akihisa Takeuchi, Kentaro Uesugi

    ACTA MATERIALIA   126   401 - 412   2017.3

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    DOI: 10.1016/j.actamat.2017.01.010

  • Diffraction-amalgamated grain boundary tracking for mapping 3D crystallographic orientation and strain fields during plastic deformation Reviewed

    Hiroyuki Toda, Takanobu Kamiko, Yasuto Tanabe, Masakazu Kobayashi, D. J. Leclere, Kentaro Uesugi, Akihisa Takeuchi, Kyosuke Hirayama

    ACTA MATERIALIA   107 ( - )   310 - 324   2016.4

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    DOI: 10.1016/j.actamat.2016.01.072

  • Application of diffraction-amalgamated grain boundary tracking to fatigue crack propagation behavior in high strength aluminum alloy Reviewed International journal

    H. Li, H. Toda, K. Uesugi, A. Takeuchi, Y. Suzuki, M. Kobayashi

    Materials Transactions   56 ( 3 )   424 - 428   2015.3

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    DOI: 10.2320/matertrans.M2014340

  • 放射光三次元計測した局所ひずみに基づくアルミニウム合金の変形集合組織形成シミュレーション Reviewed

    河野亜耶, 小林正和, 戸田裕之, 三浦博己

    軽金属   64 ( 11 )   557 - 563   2014.11

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    DOI: 10.2464/jilm.64.557

  • リバース4D材料エンジニアリング:その構想と最近の展開 Reviewed

    戸田裕之, バトレス・ラファエル, 桑水流理, 小林正和

    軽金属   64 ( 11 )   518 - 524   2014.11

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    現在、材料工学、X線光学、計算力学、情報工学の知見を結集した新しい技術体系:リバース4D材料エンジニアリング(R4ME)の提案と創成に関する研究を科研費(基盤研究S)のテーマとして推進している。現在の材料開発は、「材料設計→解析・評価→実材料創出」という時系列で進められているが、R4MEでは、これと逆方向のアプローチにより、迅速かつ高精度に高性能材料を開発するパラダイムチェンジを目指している。現実の材料のマルチスケール3D構造は、その複雑さ故、現在の科学では理論的取り扱いはおろか、そのパターン化さえ困難である。R4MEでは、微視形態を忠実に取り込む高精度4Dイメージベースシミュレーションにより、仮想的にミクロ構造を最適化する。さらに、複雑な3D/4D微視形態を従来の材料設計技術に反映できる程度に粗視化表現することで、ものづくりに展開可能な実用組織制御技術を確立することを目指している。本報は、その中間成果まとめとして著したものである。

  • 高分解能4Dイメージングによる球状黒鉛鋳鉄の疲労挙動解析 Reviewed

    清水一行, 戸田裕之, J-Y. Buffiere, J. Lachambre, 上杉健太朗, 小林正和

    鋳造工学   86 ( 1 )   19 - 25   2014.1

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  • Grain boundary tracking technique: four-dimensional visualisation technique for determining grain boundary geometry with local strain mapping Reviewed International journal

    H. Toda, Y. Ohkawa, T. Kamiko, T. Naganuma, K. Uesugi, A. Takeuchi, Y. Suzuki, M. Kobayashi

    Acta Materialia   61 ( 14 )   5535 - 5548   2013.8

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  • Compression and recovery micro-mechanisms in flexible graphite Reviewed International journal

    H. Toda, K. Tsubone, K. Shimizu, K. Uesugi, A. Takeuchi, Y. Suzuki, M. Nakazawa, Y. Aokic, M. Kobayashi

    Carbon   59   184 - 191   2013.8

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  • アルミニウム合金のせん断帯における3D/4D破壊力学的評価 Reviewed

    清水一行, 坂口祐二, 酒井一憲, 戸田裕之, 上杉健太朗, 竹内晃久, 小林正和

    軽金属   63 ( 5 )   188 - 195   2013.5

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    近年,放射光X線トモグラフィ技術の発達により,現実の材料内部のき裂やひずみの三次元(3D)計側が可能となり,従来は試験断面で行っていた二次元(2D)観察を四次元(4D)観察(時間発展挙動の3D連続観察)に展開でき,材料内部の局所的な力学量を定量化できるようになった。本論文では,X線トモグラフィを用いて,析出状態の異なる7075合金のその場破壊試験を行い,その結果,き裂先端のひずみ分布は,弾塑性破壊力学の規定するものとは大きく異なり,斜め上方および下方の二方向のせん断帯内に大きなひずみが局在化することがわかった。この局在化の程度は,時効状態など従来知られている要因だけでなく,多結晶組織や結晶方位に大きく影響され,負荷の増加とともに局在化の程度が顕著になること,またせん断帯内で相当塑性ひずみに支配される粒子の損傷が生じ,破壊力学が規定する損傷域の10倍以上遠方まで粒子の損傷が生じることを明らかにした。

  • 熱処理したアルミニウム合金ダイカストで新たに見つかった鋳肌欠陥とその疲労特性への影響 Reviewed

    増田翔太郎, 戸田裕之, 青山俊三, 折田晋, 植田将志

    鋳造工学   81 ( 10 )   475 - 481   2009.10

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  • Direct observation and image-based simulation of three-dimensional tortuous crack evolution inside opaque materials Reviewed International journal

    L. Qian, H. Toda, K. Uesugi, M. Kobayashi, T. Kobayashi

    Physical Review Letters   100 ( 11 )   115505   2008.11

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  • 高分解能X線CTイメージ解析と特徴点追跡法による三次元ひずみ計測 Reviewed International journal

    小林正和, 戸田裕之, 川井祐児, 小林俊郎, 上杉健太朗, D. S. Wilkinson, E. Maire, 青木義満

    日本金属学会誌   71 ( 2 )   181 - 186   2007.2

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  • Wavelet-based local region-of-interest reconstruction for synchrotron radiation X-ray microtomography Reviewed International journal

    L. Li, H. Toda, T. Ohgaki, M. Kobayashi, T. Kobayashi, K. Uesugi, Y. Suzuki

    Journal of Applied Physics   102   114908-1-9   2007.1

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  • 液体金属ドーピング法を用いた高分解能シンクロトロン放射光CTによる 粒界3次元ネットワーク構造の可視化 Reviewed

    小林正和, 上杉健太朗, 大垣智巳, 小林俊郎, 戸田裕之

    まてりあ   44 ( 12 )   959   2005.12

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  • Application of synchrotron x-ray microtomography to investigate ductile fracture in Al alloys Reviewed International journal

    L. Qian, H. Toda, K. Uesugi, T. Kobayashi, T. Ohgaki, M. Kobayashi

    Applied Physics Letters   87 ( 24 )   241907   2005.12

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    DOI: 10.1063/1.214208

  • Assessment of thermo-mechanical fatigue behaviors of cast Al-Si alloys by experiments and multi-step numerical simulation Reviewed International journal

    H. Toda, J. Katano, T. Kobayashi, T. Akahori, M. Niinomi

    Materials Transactions   46 ( 1 )   111 - 117   2005.1

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  • 強加工in-situ複合材料技術を利用した金属切削粉のアップグレードリサイクル Reviewed

    戸田裕之, 澤村 純平, 小林俊郎

    軽金属   54 ( 10 )   418 - 424   2004.10

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  • Assessment of fatigue crack closure phenomenon in damage tolerant aluminium alloy by in-situ high-resolution synchrotron X-ray microtomography Reviewed International journal

    H. Toda, I. Sinclair, J.-Y. Buffiere, E.Maire, T. Connolley, M. Joyce, K.H. Khor, P. Gregson

    Philosophical Magazine A   83 ( 21 )   2429 - 2448   2003.7

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  • 6082溶接材の各部の破壊靱性 Reviewed

    戸田裕之, 水谷道, 高橋明宏, 小林俊郎, M. V. Alexandru

    軽金属   51 ( 3 )   163 - 168   2001.3

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  • Hydrogen-induced pore formation in Ni–P-plated Al–Zn–Mg alloys revealed by synchrotron X-ray computed tomography and hydrogen detection Reviewed

    K. Horikawa, M. Hino, K. Shimizu, H. Toda, M. Hoshino, K. Uesugi

    International Journal of Hydrogen Energy   82   801 - 809   2024.9

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    The internal microstructures of Ni–P-plated Al–Zn–Mg-based alloys were investigated using synchrotron X-ray computed tomography, together with various analytical methods for hydrogen detection. We clarified that hydrogen-induced pores were generated and segregated near the top and bottom surfaces of a rolled sheet of a commercial-purity Al–Zn–Mg-based alloy with Ni–P plating. In contrast, such segregation of hydrogen micropores was not observed in the high-purity-grade Al–Zn–Mg alloys with Ni–P plating. This result suggests that hydrogen enters the Ni–P plating layer during the plating operation and generates pores in the surface region owing to surface inclusions. Additionally, the hydrogen-induced defects deteriorated the tensile properties such as tensile strength and elongation of the commercial-purity Al–Zn–Mg-based alloys containing higher levels of impurities such as Fe and Si with Ni–P plating.

    DOI: 10.1016/j.ijhydene.2024.07.380

  • Multi-modal 3D image-based simulation of hydrogen embrittlement crack initiation in Al-Zn-Mg alloy Reviewed

    R. Higa, H. Fujihara, H. Toda, M. Kobayashi, K. Ebihara, A. Takeuchi

    Materials Transactions   65 ( 8 )   899 - 906   2024.8

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    In Al-Zn-Mg alloy, hydrogen (H) leads remarkably to the degradation of mechanical properties. It is indispensable to suppress this phenomenon called hydrogen embrittlement (HE) for developing the high-strength Al-Zn-Mg alloy. Because intergranular fracture (IGF) is mainly observed when HE occurs in the alloy, we need to understand the initiation behavior of IGF in order to suppress HE. Heterogeneous distribution of stress, strain and H concentration usually influence the IGF initiation in polycrystalline material. In the present study, we investigated distribution of stress, strain, and H concentration in actual fractured regions by simulation employing a crystal plasticity finite element method and H diffusion analysis in a 3D image-based model, which was created based on 3D polycrystalline microstructure data obtained from X-ray imaging technique. Combining the simulation and in-situ observation of the tensile test sample by X-ray CT, we examined the distribution of stress, strain, and H concentration in actual crack initiation behavior. Based on this, the condition for intergranular crack initiation were discussed. As a result, it is revealed that stress normal to grain boundary induced by crystal plasticity dominates intergranular crack initiation. In contrast, accumulation of internal H due to the stress has little impact on crack initiation.

    DOI: 10.2320/matertrans.MT-L2024007

    Repository Public URL: https://hdl.handle.net/2324/7234369

  • Maximising mechanical properties of aluminium alloys by microstructural optimisation using a coarsened surrogate model Reviewed

    H. Toda, K. Hirayama, H. Li, R. Batres, S. Dowon, H. Fujihara

    Computational Materials Science   243   113115   2024.7

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    Surrogate-based microstructural optimization was applied to describe the relationship between local microstructural patterns and particle damage in wrought 2024 aluminium alloy. A support vector machine was used to realise high-accuracy optimisation from a limited number of high-computational-cost image-based simulation results. The methodology integrated thoroughgoing microstructural quantification, a couple of coarsening processes, and surrogate modelling. The following three objective functions were defined: the maximum principal stress in particles, the equivalent plastic strain, and the stress triaxiality in the matrix. A number of design parameters were comprehensively prepared that quantitatively expressed the size, shape, and spatial distribution of particles and pre-existing micro pores in numerous ways. The number of design parameters was then reduced from 86 to 4 for each objective function during the coarsening process. The surrogate model provided the dependency of particle damage for the size, shape, and spatial distribution of particles and micro pores in the form of a multi-dimensional response surface. It has been established that micro void formation can be described using the simple volume and surface area of particles through the elevation of particle stress and the increase in equivalent plastic strain in the matrix, and the spatial distribution of pre-existing micro pores is of crucial importance for micro void growth through the elevation of stress triaxiality in the matrix. The proposed material microstructure optimisation method provides relationships between complex local microstructural patterns and material properties that are not available from existing material development approaches. It is a computationally inexpensive and reasonable method that can optimise the complex and irregular microstructures of real materials with high efficiency and accuracy.

    DOI: 10.1016/j.commatsci.2024.113115

    Repository Public URL: https://hdl.handle.net/2324/7234366

  • In situ 3D crystallographic characterization of deformation‑induced martensitic transformation in a metastable Fe–Cr–Ni austenitic alloy by X‑ray microtomography Reviewed

    O. Takakuwa, T. Iwano, K. Hirayama, H. Toda, A. Takeuchi, M. Uesugi

    Scientific Reports   14   14445   2024.6

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    Excellent strength–ductility balance in metastable Fe–Cr–Ni austenitic alloys stems from phase transformation from austenite (fcc structure) to αʹ martensite (bcc structure) during deformation, namely deformation-induced αʹ martensitic transformation (DIMT). Here, DIMT in a metastable Fe–17Cr–7Ni austenitic alloy was detected in situ and characterized in three dimensions (3D) by employing synchrotron radiation X-ray microtomography. This technique utilizes refraction contrast, which is attributable to the presence of phase boundaries between the parent austenite and the newly formed αʹ martensite phase. By combining microtomography and position-sensitive X-ray diffraction, we succeeded in crystallographically identifying multiple αʹ martensite phases continuously transformed in four groups from a single parent austenitic phase.

    DOI: 10.1038/s41598-024-65505-3

  • Morphology evolution of β-phase in Al-Mg-Si alloys during aging treatment Reviewed International journal

    A. Ahmed, K. Uttarasak, T. Tsuchiya, S. Lee, K. Nishimura, N. Nunomura, K. Shimizu, K. Hirayama, H. Toda, M. Yamaguchi, T. Tsuru, S. Ikeno, K. Matsuda

    Journal of Alloys and Compounds   988   174234   2024.6

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    DOI: 10.1016/j.jallcom.2024.174234

  • The spatial and temporal characterization of type IV creep fracture in notched specimen of modified 9Cr–1Mo steel Reviewed

    H. Tsuruta, H. Toda, K. Hirayama, K. Shimizu, H. Fujihara, A. Takeuchi, M. Uesugi

    Materials Science and Engineering: A   902   146607   2024.6

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    In order to observe type IV fracture occurring in the HAZ fine-grained zone of a modified 9Cr–1Mo steel at high resolution, the creep damage process of a single notched specimen was continuously observed in three dimensions. The initiation, growth and coalescence behaviour of individual creep voids were clearly observed. This was combined with an analysis of the local stress state using the finite element method. Furthermore, all creep voids that could be observed in the final loading stage were traced backward in time to determine the loading stages at which the creep voids were initiated together with the growth behaviour of the individual creep voids. Significant creep void formation was observed a little further in from the bottom of the notch, where the maximum principal and hydrostatic stresses were greatest, while the stress triaxiality was greatest a little closer to the centre of the specimen than the maximum principal and hydrostatic stresses, where significant creep void growth was observed. It was found that the creep voids nucleated at an early loading stage dominated the creep failure of the specimen. The growth behaviour could be well approximated by the model that combined the diffusion law and power creep law with the constraint effect from neighbouring grains. Engineering parameters that describe the progress of type IV damage were also investigated.

    DOI: 10.1016/j.msea.2024.146607

  • Hydrogen induced debonding of Mg2Si particle/aluminum interface in Al-Mg-Si alloy Reviewed

    H. Toda, H. Fujihara, K. Hirayama, K. Shimizu, Y. Wang, S. Bhupendra, J. Tang, A. Takeuchi, M. Uesugi

    Materials Transactions   65 ( 7 )   763 - 772   2024.5

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    Recent research has shown that some intermetallic compound particles with high interfacial hydrogen trap energies (e.g., Mg2Si) are prone to damage at high hydrogen concentrations. In this study, the acceleration of particle damage in an A6061 alloy was observed in-situ via X-ray CT. The damage behavior of the particles that are located in the crack tip stress field, where high stress triaxiality causes a local increase in the hydrogen concentration, was analyzed. The influence of hydrogen on the damage behavior of the dispersed Mg2Si particles was investigated by preparing a material charged with hydrogen to achieve extremely high hydrogen concentration, and further hydrogen enrichment in a crack tip region was also utilized. Interfacial debonding of Mg2Si particles was frequently observed in the vicinity of a crack tip immediately prior to tensile fracture. Even though the fracture is typical of ductile fracture, hydrogen accelerates particle damage and reduces the macroscopic ductility of the aluminum alloy. This can be considered as a form of hydrogen embrittlement of aluminum alloys. Even in materials with relatively low hydrogen concentrations (0.85 mass ppm), interfacial debonding occurred in the hydrogen-enriched crack tip regions. A higher hydrogen concentration promoted interfacial debonding over a wider range of particle sizes and particle shapes. It can be inferred that localized hydrogen enrichment, which is expected to occur due to external hydrogen exposure, stress corrosion cracking, corrosion or crack tips, can directly contribute to debonding at the Mg2Si particle/aluminum matrix interface. According to the analysis, reduction of the diameter and simplification of the shape of Mg2Si particles are effective method for suppressing such hydrogen-induced debonding.

    DOI: 10.2320/matertrans.MT-M2024026

    Repository Public URL: https://hdl.handle.net/2324/7234367

  • Combining muon spin relaxation and DFT simulations of hydrogen trapping in Al6Mn Reviewed International journal

    K. Shimizu, K. Nishimura, K. Matsuda, S. Akamaru, N. Nunomura, T. Namiki, T. Tsuchiya, S. Lee, W. Higemoto, T. Tsuru, H. Toda

    Scripta Materialia   245   2024.5

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    DOI: 10.1016/j.scriptamat.2024.116051

    Repository Public URL: https://hdl.handle.net/2324/7234036

  • Assessment of hydrogen embrittlement behavior in Al-Zn-Mg alloy through multi-modal 3D image-based simulation Reviewed International journal

    H. Fujihara, H. Toda, K. Ebihara, M. Kobayashi, T. Mayama, K. Hirayama, K. Shimizu, A. Takeuchi, M. Uesugi

    International Journal of Plasticity   174   2024.3

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    DOI: 10.1016/j.ijplas.2024.103897

    Repository Public URL: https://hdl.handle.net/2324/7234049

  • Dominant factors controlling the initiation of hydrogen embrittlement in Al-Zn-Mg alloy Reviewed International journal

    H. Toda, K. Hirayama, S. Yamaguchi, H. Fujihara, R. Higa, K. Shimizu, A.Takeuchi , M. Uesugi

    Materials Transactions   64 ( 12 )   2729 - 2738   2023.12

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    DOI: 10.2320/matertrans.MT-M2023116

    Repository Public URL: https://hdl.handle.net/2324/7160864

  • Al-Zn-Mg合金における水素脆化発生挙動のマルチモーダル3Dイメージベース解析 Reviewed

    比嘉良太,藤原比呂,戸田裕之,小林正和,海老原健一, 竹内晃久

    軽金属   73 ( 11 )   530 - 535   2023.11

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    In Al-Zn-Mg alloy, hydrogen leads to degradation of mechanical properties. It is indispensable to suppress this phenomenon called hydrogen embrittlement (HE) for increasing the strength of Al-Zn-Mg alloy. Intergranular fracture (IGF) mainly occurs when HE affects this alloy. In order to suppress HE, we need to understand the initiation behavior of IGF. Heterogeneous distribution of stress, strain and hydrogen concentration in polycrystalline material have an influence on the IGF initiation. In the present study, distribution of stress, strain and hydrogen concentration in actual fractured regions were investigated by employing a crystal plasticity finite element method and hydrogen diffusion analysis using a 3D-image-based model. This model was created based on 3D polycrystalline microstructure data obtained from X-ray imaging technique. By combining in-situ observation of tensile test of the same sample by X-ray CT with the simulation, we compared distribution of stress, strain and hydrogen concentration with actual crack initiation behavior. Based on this, the condition for intergranular crack initiation were discussed. As a result, it is revealed that stress load perpendicular to grain boundary induced by crystal plasticity dominate intergranular crack initiation. In addition, accumulation of internal hydrogen induced by crystal plasticity had little impact on crack initiation.

    DOI: 10.2464/jilm.73.530

    Repository Public URL: https://hdl.handle.net/2324/7162034

  • Hydrogen embrittlement and its prevention in 7XXX aluminum alloys with high Zn concentrations Reviewed International journal

    K. Shimizu, H. Toda, H. Fujihara, M. Yamaguchi, M. Uesugi, A. Takeuchi, M. Nishijima, Y. Kamada

    Corrosion   79 ( 8 )   818 - 830   2023.8

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    DOI: 10.5006/4300

    Repository Public URL: https://hdl.handle.net/2324/7160861

  • 水素の局所分配制御によるアルミニウム合金の水素脆化・応力腐食割れ防止 Reviewed

    戸田裕之, 清水一行, 藤原比呂, 平山恭介, Yafei Wang, Yuantao Xu, Jiangwei Tang

    まてりあ   62 ( 6 )   359 - 367   2023.6

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    Repository Public URL: https://hdl.handle.net/2324/7160851

  • 高純度アルミニウムおよびA6061アルミニウム合金におけるポアの成長挙動と水素脱離挙動 Reviewed

    八重樫祥之,清水一行,鎌田康寛,戸田裕之,藤原比呂,上椙真之,竹内晃久

    軽金属   73 ( 5 )   212 - 217   2023.5

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    An increase in the volume fraction of pores in aluminum alloys causes a decrease in the elongation and the strength of alloys. To improve the mechanical properties of aluminum alloys, it is important to understand the growth and shrinkage behavior of pores. In this study, we analyzed the relationship between hydrogen desorption behavior and the growth/shrinking behavior of pores in A6061 alloys and pure aluminum using thermal desorption analysis and synchrotron radiation X-ray tomography. In pure aluminum, the fine pores began to annihilate at temperatures above 500°C and the relatively large pores coarsened. In contrast, the pores shrank with increasing temperature in A6061 alloy. The influence of second-phase particles has been discussed as a possible explanation for the difference in the nature of pores at elevated temperatures in pure aluminum and A6061 alloys. As in the A6061 alloy, much of the hydrogen desorbed from the pores due to heating is released externally from the second-phase particles on the aluminum surface, resulting in pore shrinkage due to the internal pressure drop of pores.

    DOI: 10.2464/jilm.73.212

  • Identification of hydrogen trapping in aluminum alloys via muon spin relaxation method and first-principles calculations Reviewed International journal

    T. Tsuru, K. Nishimura, K. Matsuda, N. Nunomura, T. Namiki, S. Lee, W. Higemoto, T. Matsuzaki, M. Yamaguchi, K. Ebihara, K. Shimizu, H. toda

    Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science   2023.3

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    DOI: 10.1007/s11661-023-07024-w

  • Direct observation of three-dimensional short fatigue crack closure behavior in Ti-6Al-4V alloy using ultra-high-resolution X-ray microtomography Reviewed International journal

    V. Tubei, H. Toda, W. Ketanond, H. Fujihara, O. Takakuwa, A. Takeuchi, M. Uesugi

    International Journal of Fatigue   168   2023.3

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    DOI: 10.1016/j.ijfatigue.2022.107428

    Repository Public URL: https://hdl.handle.net/2324/7153597

  • Existence of hexagonal tabular β-phase in Al–Mg–Si alloys containing noble metal elements Reviewed International journal

    T. Tsuchiya, K. Uttarasak, S. Lee, A. Ahmed, S. Mikmekova, K. Nishimura, N. Nunomura, K. Shimizu, K. Hirayama, H. Toda, M Yamaguchi, T. Tsuru, J. Nakamura, S. Ikeno, K. Matsuda

    Materials Today Communications   35   2023.1

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    DOI: 10.1016/j.mtcomm.2023.106198

  • Influence of hydrogen on the damage behavior of IMC particles in Al–Zn–Mg–Cu alloys Reviewed International journal

    R. Oikawa, K. Shimizu, Y. Kamada, H. Toda, H. Fujihara, M. Uesugi, A. Takeuchi

    Materials Transactions   63 ( 12 )   1607 - 1616   2022.10

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    DOI: 10.2320/matertrans.MT-L2022020

  • Suppression of hydrogen embrittlement due to local partitioning of hydrogen to dispersed intermetallic compound particles in Al-Zn-Mg-Cu alloys Reviewed International journal

    Materials Transactions   63 ( 10 )   1406 - 1415   2022.10

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    DOI: 10.2320/matertrans.MT-L2022007

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  • Al-Zn-Mg-Cu合金中のIMC粒子損傷に及ぼす水素の影響 Reviewed

    及川涼一, 清水一行, 鎌田康寛, 戸田裕之, 藤原比呂, 上椙真之, 竹内晃久

    軽金属   72 ( 7 )   411 - 419   2022.7

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    In recent years, it has been reported that intermetallic compound particles can suppress hydrogen embrittlement by hydrogen trapping into them. Some intermetallic particles in aluminum alloys, such as Al7Cu2Fe, have internal hydrogen trap sites and it is proposed that hydrogen embrittlement can be suppressed by preferential hydrogen partitioning to these sites. However, intermetallic compound particles act as fracture origin, and excessive addition degrades the mechanical properties. In this study, we quantitatively evaluated the damage and decohesion behavior of intermetallic compound particles in high-hydrogen 7XXX aluminum alloys by using in-situ synchrotron radiation X-ray tomography. As the results, it has been revealed that hydrogen induced early high-strain localization, and the Al7Cu2Fe particles were damaged in that region due to own brittleness, resulting in early fracture. Hydrogen had no effect on the fracture and debonding behavior of intermetallic compound particles, suggesting that observed brittle fracture of particles is dependent on the mechanical properties of the particles.

    DOI: 10.2464/jilm.72.411

  • Crystallographic analysis of hydrogen embrittlement behavior in aluminum alloy using diffraction contrast tomography Reviewed International journal

    K. Hirayama, H. Toda, T. Suzuki, M. Uesugi, A. Takeuchi, W. Ludwig

    Materials Transactions   3 ( 4 )   586 - 591   2022.4

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    DOI: 10.2320/matertrans.MT-L2021020

    Repository Public URL: https://hdl.handle.net/2324/7153598

  • A quantified study of the resistance of duplex stainless steels to HISC: Part 1-significance of the three-dimensional phase distributions and morphological properties on hydrogen transport Reviewed International journal

    L. Blanchard, K. Sotoudeh, H. Toda, K. Hirayama, J. Laurencin, H. Dong

    Corrosion   78 ( 3 )   249 - 257   2022.3

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    DOI: 10.5006/3960

  • 高分解能・高エネルギーX線位相コントラスト法と構造材料への応用 Reviewed

    平山恭介, 戸田裕之, 蘇航, 岡村海, 鈴木芳生, 竹内晃久, 上椙真之, 清水一行

    SPring-8/SACLA利用研究成果集   10 ( 1 )   51 - 59   2022.2

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    DOI: 10.18957/rr.10.1.51

  • アルミニウム鋳造合金の疲労亀裂発生に関するCT観察と有限要素解析 Reviewed

    桑水流理, 寺西正輝, 小林正和, 戸田裕之

    SPring-8/SACLA利用研究成果集   9 ( 6 )   383 - 390   2021.10

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    板状の介在物粒子を含むアルミニウム鋳造合金の疲労破壊挙動を放射光 CT および大規模有限要素解析により検証した。疲労亀裂は主として介在物と母相の界面剥離から生じた。界面剥離と介在物粒子の破損はほぼ同時に多数発生し、多数の空隙を生じさせた。単一の亀裂の進展速度は遅く、多数の空隙が合体することで、亀裂は進展した。材料表面では Al 母相の塑性ひずみが蓄積し易く、Al 母相のひずみ硬化による応力増加が、材料表面近傍での介在物の破損を生じさせた。

  • 3D short fatigue crack closure behavior in Ti-6Al-4V alloy investigated using in-situ high resolution synchrotron X-ray tomography Reviewed International journal

    V. Tubei, H. Toda, M. Hassanipour, K. Hirayama, O. Takakuwa, A. Takeuchi and M. Uesugi

    Engineering Fracture Mechanics   249   2021.5

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    DOI: 10.1016/j.engfracmech.2021.107755

    Repository Public URL: http://hdl.handle.net/2324/4483403

  • Assessment of hydrogen accumulation behavior in AlZnMg alloy under strain with Kelvin force microscopy Reviewed International journal

    H. Fujihara, H. Toda, M. Arita, K. Shimizu, A. Takeuchi, K. Uesugi

    Materials Transactions   62 ( 5 )   636 - 641   2021.5

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    DOI: 10.2320/matertrans.l-m2020873

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  • Data rich imaging approaches assessing fatigue crack initiation and early propagation in a DS superalloy at room temperature Reviewed International journal

    Y. G. Tan, D.J. Bull, R. Jiang, A. Evangelou, S. Chaudhuri, S. Octaviani, F. Pierron, N. Gao, H. Toda, I. Sinclair and P.A.S. Reed

    Materials Science and Engineering A   805   2021.2

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    DOI: 10.1016/j.msea.2020.140592

  • High-energy X-ray nanotomography introducing an apodization Fresnel zone plate objective lens Reviewed International journal

    A. Takeuchi, K .Uesugi, M. Uesugi, H. Toda, K. Hirayama, K. Shimizu, K. Matsuo and T. Nakamura

    Review of Scientific Instruments   92   2021.1

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    DOI: 10.1063/5.0020293

  • Hydrogen trapping in Mg₂Si and Al₇FeCu₂ intermetallic compounds in aluminum alloy : First-principles calculations Reviewed International journal

    M. Yamaguchi, T. Tsuru, K. Ebihara, M. Itakura, K. Matsuda, K.Shimizu, H. Toda

    Materials Transactions   61 ( 10 )   1907 - 1911   2020.10

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    Hydrogen Trapping in Mg2Si and Al7FeCu2 Intermetallic Compounds in Aluminum Alloy: First-Principles Calculations
    <p>From first-principles calculations, we estimated the trapping energy of hydrogen atom at the interstitial site of perfect crystals of Mg2Si and Al7FeCu2 intermetallic compounds in the aluminum matrix. We found that Al7FeCu2 trapped hydrogen atoms strongly, whereas Mg2Si did not. The highest trapping energy in Al7FeCu2 is 0.56 eV/atom. We also found that the density of hydrogen trapping can be increased up to about 13 atoms/nm3 while keeping high trapping energy of about 0.40 eV/atom. We inferred that the Al7FeCu2 phase might remove hydrogen from the aluminum matrix, hence, preventing hydrogen embrittlement of aluminum alloy.</p>

    DOI: 10.2320/matertrans.MT-M2020201

  • The possible transition mechanism for the meta-stable phase in the 7xxx aluminium Reviewed International journal

    A. Bendo, K. Matsuda, K. Nishimura, N. Nunomura, T. Tsuchiya, S. Lee, C. D. Marioara, T. Tsuru, M. Yamaguchi, K. Shimizu, H. Toda

    Materials Science and Technology   36 ( 15 )   1621 - 1627   2020.9

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    DOI: 10.1080/02670836.2020.1821323

  • Damage micromechanisms in high Mn and Zn content 7XXX aluminum alloys

    M. S. Bhuiyan, H. Toda, K. Uesugi, A. Takeuchi, Y. Watanabe

    Materials Science and Engineering: A   793   139423 - 139423   2020.8

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    DOI: 10.1016/j.msea.2020.139423

  • 中性子ラジオグラフィー・トモグラフィーによる純パラジウム中の水素濃度解析 Reviewed

    清水一行, 戸田裕之, 平山恭介, 藤原比呂, 松本佳久, 伊藤大介, 齊藤泰司, 鎌田康寛

    日本金属学会誌   84 ( 8 )   270 - 275   2020.8

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    Hydrogen in materials degrades mechanical properties, which is widely recognized as hydrogen embrittlement. To understand hydrogen embrittlement, it is necessary to clarify the accumulation behavior of hydrogen under stress. The neutron radiography and neutron tomography techniques are applied to examine whether hydrogen accumulation behavior can be visualized directly. Palladium specimens with and without hydrogen were prepared for the neutron imaging experiment under stress. Solute hydrogen has caused distinct contrast change in both the neutron radiography and neutron tomography. Hydrogen distribution at a notch-tip in a loaded specimen has not been visualized in the tomographic cross-sectional images. It can be inferred that this is fundamentally attributable to low spatial resolution of the present imaging set-up, and possibility to visualize hydrogen distribution due to loading is discussed.

    DOI: 10.2320/jinstmet.J2020017

    Repository Public URL: http://hdl.handle.net/2324/4485350

  • Study of creep damage in a 10.86% Cr heat resistant steel using synchrotron X-ray microtomography Reviewed International journal

    C. Gupta, H. Toda, C. Schlacher, P. Mayr, C. Sommitsch, K. Uesugi, Y. Suzuki, A. Takeuchi, M. Kobayashi

    Advanced Materials Research, Century of stainless steels   794   476 - 483   2020.7

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    DOI: 10.4028/www.scientific.net/AMR.794.476

  • Influence of nanovoids in the hydrogen embrittlement fracture of Al-Zn-Mg-Cu alloys Reviewed International journal

    Kazuyuki Shimizu, Hiroyuki Toda, Chihiro Kadogawa, Hiro Fujihara, Akihisa Takeuchi

    Materialia   11   100667 - 100667   2020.6

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    DOI: 10.1016/j.mtla.2020.100667

    Repository Public URL: http://hdl.handle.net/2324/4485341

  • An unreported precipitate orientation relationship in Al-Zn-Mg based alloys Reviewed

    Artenis Bendo, Kenji Matsuda, Adrian Lervik, Tomohito Tsuru, Katsuhiko Nishimura, Norio Nunomura, Randi Holmestad, Calin D. Marioara, Kazuyuki Shimizu, Hiroyuki Toda, Masatake Yamaguchi

    Materials Characterization   158   109958 - 109958   2019.12

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    An unreported precipitate orientation relationship in Al-Zn-Mg based alloys

    DOI: 10.1016/j.matchar.2019.109958

  • 中性子イメージングによる純パラジウムおよびアルミニウム合金中の水素濃度解析 Reviewed

    清水 一行, 林田 洋寿, 戸田 裕之, 甲斐 哲也, 松本 吉弘, 松本 佳久

    日本金属学会誌   83 ( 11 )   434 - 440   2019.11

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    <p>The visualization of hydrogen distribution in materials is important to understand hydrogen embrittlement behavior. Neutron imaging experiment was carried out in order to visualize the distribution of solute hydrogen in an Al-10.1%Zn-1.2%Mg alloy and a pure palladium after hydrogen charging. Changes in the contrast of neutron transmission images caused by hydrogen were clearly observed in a palladium. In the wavelength range of 2-3 Å and 5-13.5 Å, the mean neutron transmission around the center of a hydrogen-charged palladium were 0.692 and 0.511, respectively. The hydrogen content in a palladium was estimated to be 10.8 mol% from the measured neutron transmission. In this study, it has been demonstrated that hydrogen content can be analyzed even in non-monochromatic neutron imaging by considering the wavelength dependence of neutron intensity, and the effects of incoherent scattering and of Bragg-edge on transmission. On the other hand, hydrogen could not be observed from the neutron transmission image in Al-Zn-Mg alloys. This was due to the low hydrogen content, which was mass ppm level even after hydrogen charging, and statistical precision was not sufficient to discuss the amount of hydrogen of the mass ppm order.</p>

    DOI: 10.2320/jinstmet.J2019016

    Repository Public URL: http://hdl.handle.net/2324/4355441

  • Effects of 3D microstructural distribution on short crack growth behavior in two bimodal Ti-6Al-4V alloys Reviewed

    M. Hassanipour, S. Watanabe, K. Hirayama, H. Toda, K. Uesugi, A. Takeuchi

    Materials Science and Engineering A   766 ( 138264 )   2019.10

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    Effects of 3D microstructural distribution on short crack growth behavior in two bimodal Ti-6Al-4V alloys

    DOI: 10.1016/j.msea.2019.138264

    Repository Public URL: http://hdl.handle.net/2324/4150459

  • X線マイクロトモグラフィによる改良9Cr-1Mo鋼溶接部におけるクリープボイドの定量評価 Reviewed

    鶴田 秀樹, 戸田 裕之, 弥富 政享, 吉田 公亮, 竹内 晃久, 上椙 真之, 田淵 正明, 本郷 宏通

    材料   68 ( 8 )   599 - 606   2019.8

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    DOI: 10.2472/jsms.68.599

    Repository Public URL: http://hdl.handle.net/2324/4123952

  • Characterisation of structural similarities of precipitates in Mg-Zn and Al-Zn-Mg alloys systems Reviewed

    A. Bendo, T. Maeda, K. Matsuda, A. Lervik, R. Holmestad, C. D. Marioara, K. Nishimura, N. Nunomura, H. Toda, M. Yamaguchi, K. Ikeda, T. Homma

    Philosophical Magazine   99 ( 21 )   2619 - 2635   2019.7

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    Characterisation of structural similarities of precipitates in Mg-Zn and Al-Zn-Mg alloys systems

    DOI: 10.1080/14786435.2019.1637032

  • Hydrogen partitioning behavior and related hydrogen embrittlement in Al-Zn-Mg alloys Reviewed International journal

    Kazuyuki Shimizu, Hiroyuki Toda, Hiro Fujihara, Kyosuke Hirayama, Kentaro Uesugi, Akihisa Takeuchi

    Engineering Fracture Mechanics   216   106503 - 106503   2019.7

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    DOI: 10.1016/j.engfracmech.2019.106503

    Repository Public URL: http://hdl.handle.net/2324/4483200

  • 4D characterization of the stress corrosion cracking behavior in Al-10Mg aluminium alloy via synchrotron X-ray tomography Reviewed

    D. Fu, H. Toda, H. Su, K. Hirayama, K. Uesugi, A. Takeuchi

    Proceedings of the International Offshore and Polar Engineering Conference (ISOPE 2019)   4   4199 - 4203   2019.6

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    4D characterization of the stress corrosion cracking behavior in Al-10Mg aluminium alloy via synchrotron X-ray tomography

  • Effect of Copper Addition on Precipitation Behavior near Grain Boundary in AlZnMg Alloy Reviewed

    K. Matsuda, T. Yasumoto, A. Bendo, T. Tsuchiya, S. Lee, K. Nishimura, N. Nunomura, C. D. Marioara, A. Levik, R. Holmestad, H. Toda, M. Yamaguchi, K. Ikeda, T. Homma, S.Ikeno

    Materials Transactions   60 ( 8 )   1688 - 1696   2019.6

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    Effect of Copper Addition on Precipitation Behavior near Grain Boundary in AlZnMg Alloy

    DOI: 10.2320/matertrans.L-M2019828

  • Local Deformation and Fracture Behavior of High-Strength Aluminum Alloys Under Hydrogen Influence Reviewed International journal

    K. Shimizu, H. Toda, K. Uesugi, A. Takeuchi

    Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science   51A   1 - 19   2019.6

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    Local Deformation and Fracture Behavior of High-Strength Aluminum Alloys Under Hydrogen Influence

    DOI: 10.1007/s11661-019-05304-y

    Repository Public URL: http://hdl.handle.net/2324/4483196

  • Al-10Mg合金における応力腐食割れ挙動に及ぼす水素の影響 Reviewed

    平山 恭介, 戸田 裕之, 清水 一行, 上杉 健太朗, 竹内 晃久, 益永 涼平

    軽金属   69 ( 4 )   223 - 227   2019.4

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    DOI: 10.2464/jilm.69.223

  • Assessment of predominant microstructural features controlling 3D short crack growth behavior via a surrogate approach in Ti-6Al-4V Reviewed

    M. Hassanipour, S. Watanabe, K. Hirayama, H. Li, H. Toda, K. Uesugi, A.Takeuchi

    Materials Science and Engineering: A   751   351 - 362   2019.3

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    Assessment of predominant microstructural features controlling 3D short crack growth behavior via a surrogate approach in Ti-6Al-4V

    DOI: 10.1016/j.msea.2019.01.116

    Repository Public URL: http://hdl.handle.net/2324/4150458

  • Al-8&#37;Zn-1&#37;Mg合金における水素脱離挙動 Reviewed

    藤原 比呂, 戸田 裕之, 清水 一行, 竹内 晃久, 上杉 健太朗

    軽金属   69 ( 3 )   186 - 193   2019.3

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    DOI: 10.2464/jilm.69.186

  • Abnormally enhanced diamagnetism in Al-Zn-Mg alloys Reviewed International journal

    K. Nishimura, K. Matsuda, S. Lee, N. Nunomura, T. Shimano, A. Bendo, K. Watanabe, T. Tsuchiya, T. Namiki, H. Toda, M. Yamaguchi

    Journal of Alloys and Compounds   774   405 - 409   2019.2

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    Abnormally enhanced diamagnetism in Al-Zn-Mg alloys
    Temperature and time dependences of magnetization of Al-1.0&#37;Zn-4.2&#37;Mg, Al-2.6&#37;Zn-3.2&#37;Mg, Al-4.1&#37; Zn-1.1&#37;Mg, and Al-5&#37;Zn (at.&#37;) alloys were measured in the range between 10 and 310 K after various periods of natural aging and peak-aged heat treatments. Enhanced diamagnetic contributions on the magnetization were observed for the as-quenched Al-Zn-Mg alloys for the first time. The enhanced diamagnetism observed in Al-2.6&#37;Zn-3.2&#37;Mg and Al-4.1&#37;Zn-1.1&#37;Mg were found to largely alter in natural aging, while that of Al-1.0&#37;Zn-4.2&#37;Mg little changed. After peak-aged heat treatments, the diamagnetism of Al-Zn-Mg was largely reduced. The binary Al-5&#37;Zn showed neither enhanced diamagnetism nor natural aging effect on the magnetization. Isothermal time variations of magnetization of Al-Zn-Mg alloys at 300 K were found to be related with solute-vacancy clustering. (C) 2018 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jallcom.2018.10.037

  • Short crack growth behavior and its transitional interaction with 3D microstructure in Ti-6Al-4V Reviewed International journal

    M. Hassanipour, S. Watanabe, K. Hirayama, H. Toda, K. Uesugi, A. Takeuchi

    Materials Science and Engineering A   738   229 - 237   2018.12

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    Short crack growth behavior and its transitional interaction with 3D microstructure in Ti-6Al-4V

    DOI: 10.1016/j.msea.2018.09.073

    Repository Public URL: http://hdl.handle.net/2324/4123955

  • 5052アルミニウム合金の引張変形中のミクロポアとボイドのサイズと分布

    北條 智彦, 菊池 護, 清水 一行, 戸田 裕之, 竹内 晃久, 秋山 英二

    軽金属   68 ( 11 )   630 - 634   2018.11

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    <p>Micropore growth and void initiation and growth behaviors of 5052 aluminum alloys during tensile deformation were observed by means of X-ray computed tomography (CT) using the X-ray image beamline (BL20XU) of the Japanese synchrotron radiation facility (SPring-8). Tensile tests were carried out in ambient and wet conditions. In 5052 alloy tensile tested in wet condition, the drop of stress followed by the maximum stress was remarkable, and the fracture strain was reduced in comparison with those of 5052 alloy tested in ambient condition. The number of fine micropores and voids decreased in 5052 alloy when plastic deformation started and the decrease in the amount of fine micropores and voids in the wet condition was less than those in ambient condition. These might be caused by the acceleration of micropore growth and void initiation and growth during tensile testing in wet condition.</p>

    DOI: 10.2464/jilm.68.630

  • Microstructure evolution in a hydrogen charged and aged Al–Zn–Mg alloy Reviewed

    3   50 - 56   2018.11

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    Microstructure evolution of alloy with composition Al - 3.4 Zn - 1.9 Mg (at. &#37;) was tracked using high resolution imaging and electron diffraction during ageing at 120 degrees C after being initially natural aged for 4 days. Hydrogen was charged in microstructure by cutting samples in Electrical Discharge Machine immediately after being quenched from solid solution temperature. Transmission Electron Microscope observations revealed a higher presence of high aspect ratio GPII-zones in microstructure of hydrogen charged and aged samples. Correlation was made with previously reported hydrogen effect into vacancy formation.

    DOI: 10.1016/j.mtla.2018.09.035

  • First-principles calculation of multiple hydrogen segregation along aluminum grain boundaries Reviewed

    M.Yamaguchi, K.-I. Ebihara, M.Itakura, T.Tsuru, K.Matsuda, H.Toda

    Computational Materials Science   156   368 - 375   2018.10

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    First-principles calculation of multiple hydrogen segregation along aluminum grain boundaries

    DOI: 10.1016/j.commatsci.2018.10.015

  • Evolution Behavior of Hydrogen-Induced Nano Voids in Al–Zn–Mg–Cu Aluminum Alloys under Loading Reviewed

    Hongye Gao, Hang Su, Kazuyuki Shimizu, Chihiro Kadokawa, Hiroyuki Toda, Yasuko Terada, Kentaro Uesugi, Akihisa Takeuchi

    MATERIALS TRANSACTIONS   59 ( 9 )   1532 - 1535   2018.9

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    DOI: 10.2320/matertrans.m2018156

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  • The Role of Hydrogen on the Local Fracture Toughness Properties of 7XXX Aluminum Alloys Reviewed International journal

    S.Bhuiyan, H. Toda, K. Shimizu, H. Su, K. Uesugi, A. Takeuchi, Y. Watanabe

    Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science   49 ( 11 )   5368 - 5381   2018.8

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    The Role of Hydrogen on the Local Fracture Toughness Properties of 7XXX Aluminum Alloys

    DOI: 10.1007/s11661-018-4880-0

  • 超並列ボクセル有限要素解析および形状計測によるアルミニウム鋳造合金の介在物破損の統計的評価 Reviewed

    寺西正輝, 桑水流理, 小林正和, 戸田裕之

    日本機械学会論文集   84 ( 863 )   18 - 28   2018.7

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    DOI: 10.1299/transjsme.18-00028

  • First-principles study of hydrogen segregation at the MgZn2 precipitate in Al-Mg-Zn alloys Reviewed International journal

    T.Tsuru, M.Yamaguchi, K. Ebihara, M.Itakura, Y.Shiihara, K.Matsuda, H.Toda

    Computational Materials Science   148   301 - 306   2018.6

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    First-principles study of hydrogen segregation at the MgZn2 precipitate in Al-Mg-Zn alloys

    DOI: 10.1016/j.commatsci.2018.03.009

  • Atomic scale HAADF-STEM study of η′ and η1phases in peak-aged Al-Zn-Mg alloys Reviewed International journal

    A. Bendo, K. Matsuda, S. Lee, K. Nishimura, N. Nunomura, H. Toda, M. Yamaguchi, T. Tsuru, K. Hirayama, K. Shimizu, H. Gao, K. Ebihara, M. Itakura, T. Yoshida, S. Murakami

    Journal of Materials Science   53 ( 6 )   4598 - 4611   2017.12

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    Atomic scale HAADF-STEM study of η′ and η1phases in peak-aged Al-Zn-Mg alloys
    The microstructures of precipitates in Al-Zn-Mg alloys in peak-aged condition have been studied using scanning transmission electron microscope. The same thermo-mechanical treatment was applied in all alloys. Investigation of peak-aged samples revealed that the most commonly found phases were eta' and eta (1) with their respective habit planes on {111}(Al) and {100}(Al). eta' phases under [110](Al) were analyzed and compared with eta' structure models. Furthermore, a close inspection of eta (1) phase as the second most found precipitate revealed that it incorporates an anti-phase resembling boundary, not observed in other orientation relationships that precipitates create with Al matrix, in addition, differences in matrix-precipitate interfaces between eta'/eta (2) and eta (1) phases were noticed. This paper addresses the first part to the analysis of eta' phase. Next part is extended to the analysis of the eta (1) phase.

    DOI: 10.1007/s10853-017-1873-0

  • Mapping 3D crystallographic orientation and strain fields in deformed polycrystalline aluminium alloy by diffraction-amalgamated grain boundary tracking Reviewed

    K. Hirayama, H.Toda, M. Kobayashi

    SPring-8 / SACLA Research Frontiers 2016   62 ( 63 )   2017.8

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    Mapping 3D crystallographic orientation and strain fields in deformed polycrystalline aluminium alloy by diffraction-amalgamated grain boundary tracking

  • Influence of intermetallic particles on the initiation and growth behavior of hydrogen micropores during high-temperature exposure in Al-Zn-Mg-Cu aluminum alloys Reviewed

    Hang Su, Shahnewaz Bhuiyan, Hiroyuki Toda, Kentaro Uesugi, Akihisa Takeuchi, Yoshio Watanabe

    SCRIPTA MATERIALIA   135   19 - 23   2017.7

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    DOI: 10.1016/j.scriptamat.2017.03.020

  • Corrigendum to “Damage micromechanisms in dual-phase steel investigated with combined phase- and absorption-contrast tomography” [Acta Mater. 126 (2017) 401–412] Reviewed

    Hiroyuki Toda, Akihisa Takijiri, Masafumi Azuma, Shohei Yabu, Kunio Hayashi, Dowon Seo, Masakazu Kobayashi, Kyosuke Hirayama, Akihisa Takeuchi, Kentaro Uesugi

    Acta Materialia   133   441 - 441   2017.7

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    DOI: 10.1016/j.actamat.2017.06.007

  • 不純物Pの低減により共晶Si相を微細化したAl-7&#37;Si合金の損傷挙動 Reviewed

    清水 一行, 戸田 裕之, 豊田 充潤, 平山 恭介, 上杉 健太朗, 竹内 晃久

    鋳造工学   89 ( 5 )   239 - 245   2017.5

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    DOI: 10.11279/jfes.89.239

    Repository Public URL: http://hdl.handle.net/2324/4485344

  • ピーク時効したZn/Mgの異なるAl–Zn–Mg合金における時効析出組織と機械的性質 Reviewed

    李昇原, 渡邊克己, 松田健二, 西村克彦, 布村紀男, 戸田裕之, 平山恭介, 清水一行, 高紅叶, 山口正剛, 海老原健一, 板倉充洋, 都留智仁, 吉田 朋夫, 村上哲, 池野進

    軽金属   67 ( 5 )   162 - 167   2017.5

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    DOI: 10.2464/jilm.67.162

  • 超高速・低温フレームを特徴とする衝撃焼結被覆技術を用いた,昇華性材料,窒化アルミニウム(AlN)溶射皮膜の気孔率評価方法の開発 Reviewed

    髙橋勇一, 石田一成, 河合貴士, 山本亮一, 小林正和, 戸田裕之

    SPring-8/SACLA 利用研究成果集 SPring-8 Section B: Industrial Application Report   5 ( 1 )   88 - 91   2017.1

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  • ADC12合金のミクロな偏析の位相イメージングと損傷挙動 Reviewed

    山田隆介, 戸田裕之, 竹内晃久, ベーゼル靖子

    鋳造工学   89 ( 1 )   10 - 16   2017.1

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    DOI: 10.11279/jfes.89.10

  • Construction of finite element meshes for polycrystal grains model from X-ray CT image Reviewed International journal

    M. Kobayashi, T. Matsuyama, A. Kouno, H. Toda, H. Miura

    MATERIALS TRANSACTIONS   57 ( 12 )   2089 - 2096   2016.12

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    DOI: doi.org/10.2320/matertrans.M2016260

  • Influences of Hydrogen Micropores and Intermetallic Particles on Fracture Behaviors of Al-Zn-Mg-Cu Aluminum Alloys Reviewed

    Hang Su, Takuro Yoshimura, Hiroyuki Toda, Md Shahnewaz Bhuiyan, Kentaro Uesugi, Akihisa Takeuchi, Nobuhito Sakaguchi, Yoshio Watanabe

    METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE   47A ( 12 )   6077 - 6089   2016.12

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    DOI: 10.1007/s11661-016-3773-3

  • Three-dimensional stress and strain around real shape Si particles in cast aluminum alloy under cyclic loading Reviewed

    Masaki Teranishi, Osamu Kuwazuru, Shota Gennai, Masakazu Kobayashi, Hiroyuki Toda

    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   678   273 - 285   2016.12

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    DOI: 10.1016/j.msea.2016.10.004

  • State of 3-D micro-damage in hydrogen redistributed regions of precharged high strength aluminium alloy Reviewed

    C. Gupta, H. Toda, T. Fujioka, M. Kobayashi, H. Hoshino, K. Uesugi, A. Takeuchi, Y. Suzuki

    CORROSION SCIENCE   111   26 - 38   2016.10

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    DOI: 10.1016/j.corsci.2016.04.050

    Repository Public URL: http://hdl.handle.net/2324/4150460

  • Ductile fracture via hydrogen pore mechanism in an aluminum alloy; quantitative microstructural analysis and image-based finite element analysis Reviewed

    Akihide Hosokawa, Hiroyuki Toda, Rafael Batres, Han Li, Osamu Kuwazuru, Masakazu Kobayashi, Hidetaka Yakita

    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   671   96 - 106   2016.8

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    DOI: 10.1016/j.msea.2016.06.037

  • Quantitative tomography of hydrogen precharged and uncharged Al-Zn-Mg-Cu alloy after tensile fracture Reviewed

    C. Gupta, H. Toda, T. Fujioka, M. Kobayashi, H. Hoshino, K. Uesugi, A. Takeuchi, Y. Suzuki

    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   670 ( - )   300 - 313   2016.7

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    DOI: 10.1016/j.msea.2016.06.011

    Repository Public URL: http://hdl.handle.net/2324/4149942

  • Influences of hydrogen on deformation and fracture behaviors of high Zn 7XXX aluminum alloys Reviewed

    Md. Shahnewaz Bhuiyan, Yuki Tada, Hiroyuki Toda, Su Hang, Kentaro Uesugi, Akihisa Takeuchi, Nobuto Sakaguchi, Yoshio Watanabe

    INTERNATIONAL JOURNAL OF FRACTURE   200 ( 1-2 )   13 - 29   2016.7

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    DOI: 10.1007/s10704-016-0092-z

  • Corrigendum to "Combined microtomography, thermal desorption spectroscopy, X-ray diffraction study of hydrogen trapping behavior in 7XXX aluminum alloys" [Mater. Sci. Eng. A 655 (2016) 221-228] doi: 10.1016/j.msea.2015.12.092 Reviewed

    Md. Shahnewaz Bhuiyan, Hiroyuki Toda, Zhang Peng, Su Hang, Keitaro Horikawa, Kentaro Uesugi, Akihisa Takeuchi, Nobuto Sakaguchi, Yoshio Watanabe

    Materials Science and Engineering A   668   271 - 272   2016.6

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    DOI: 10.1016/j.msea.2016.05.010

  • 鉄鋼材料表面に形成された緑膿菌のバイオフィルムは微生物腐食と生体鉱物化を誘導する Reviewed

    生貝初, 小林正和, 平井信充, 戸田裕之, 諸星知広, 池田宰, 上杉健太朗, 黒田大介, 兼松秀行

    29   93 - 96   2016.5

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  • 3D fracture behaviours in dual-phase stainless steel Reviewed International journal

    H. Toda, F. Tomizato, R. Harasaki, D. Seo, M. Kobayashi, A. Takeuchi, K. Uesugi

    ISIJ International   56 ( 5 )   883 - 892   2016.5

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    3D Fracture Behaviours in Dual-phase Stainless Steel

    DOI: 10.2355/isijinternational.ISIJINT-2015-631

  • Identification of material properties using nanoindentation and surrogate modeling Reviewed

    Han Li, Leonardo Gutierrez, Hiroyuki Toda, Osamu Kuwazuru, Wenli Liu, Yoshihiko Hangai, Masakazu Kobayashi, Rafael Batres

    INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES   81 ( - )   151 - 159   2016.3

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    DOI: 10.1016/j.ijsolstr.2015.11.022

  • Combined microtomography, thermal desorption spectroscopy, X-ray diffraction study of hydrogen trapping behavior in 7XXX aluminum alloys Reviewed

    Md. Shahnewaz Bhuiyan, Hiroyuki Toda, Zhang Peng, Su Hang, Keitaro Horikawa, Kentaro Uesugi, Akihisa Takeuchi, Nobuto Sakaguchi, Yoshio Watanabe

    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   655 ( - )   221 - 228   2016.2

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    DOI: 10.1016/j.msea.2015.12.092

  • 塗装レス高輝度(メタリック)樹脂成形における色ムラの原因解明 Reviewed

    髙橋勇一, 小宅勝, 小林潤哉, 小林正和, 戸田裕之

    SPring-8/SACLA 利用研究成果集 SPring-8 Section B: Industrial Application Report   Vol. 4 ( No.1 )   84 - 88   2016.1

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  • Construction of finite element meshes for polycrystal grains model from X-ray CT image Reviewed

    M. Kobayashi, T. Matsuyama, A. Kouno, H. Toda, H. Miura

    Materials Transactions   57 ( 12 )   2089 - 2096   2016.1

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    DOI: 10.2320/matertrans.M2016260

  • Optimization of hydrogen embrittlement in Al-Zn-Mg alloys Reviewed International journal

    K. Shimizu, H. Toda, K. Sasaki, K. Uesugi, A. Takeuchi

    Proceedings of Materials Science & Technology 2015   1583 - 1587   2015.10

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  • 鉄鋼材料に微生物腐食を引き起こす緑膿菌バイオフィルムの生体鉱物化 Reviewed

    生貝 初, 平井信充, 小林正和, 戸田裕之, 諸星知広, 池田 宰, 上杉健太朗, 黒田大介, 兼松秀行

    材料とプロセス   28 ( 2 )   468 - 470   2015.9

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  • Non-destructive and three-dimensional measurement of local strain development during tensile deformation in an aluminium alloy Reviewed

    M Kobayashi, H Miura, H Toda

    IOP Conference Series: Materials Science and Engineering   89 ( 1 )   012030 - 012030   2015.8

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    Non-destructive and three-dimensional measurement of local strain development during tensile deformation in an aluminium alloy
    Anisotropy of mechanical responses depending on crystallographic orientation causes inhomogeneous deformation on the mesoscopic scale (grain size scale). Investigation of the local plastic strain development is important for discussing recrystallization mechanisms, because the sites with higher local plastic strain may act as potential nucleation sites for recrystallization. Recently, high-resolution X-ray tomography, which is non-destructive inspection method, has been utilized for observation of the materials structure. In synchrotron radiation X-ray tomography, more than 10,000 microstructural features, like precipitates, dispersions, compounds and hydrogen pores, can be observed in aluminium alloys. We have proposed employing these microstructural features as marker gauges to measure local strains, and then have developed a method to calculate the three-dimensional strain distribution by tracking the microstructural features. In this study, we report the development of local plastic strain as a function of the grain microstructure in an aluminium alloy by means of this three-dimensional strain measurement technique. Strongly heterogeneous strain development was observed during tensile loading to 30&#37;. In other words, some parts of the sample deform little whereas another deforms a lot. However, strain in the whole specimen was keeping harmony. Comparing the microstructure with the strain concentration that is obtained by this method has a potential to reveal potential nucleation sites of recrystallization.

    DOI: 10.1088/1757-899x/89/1/012030

  • Three-dimensional investigation of void coalescence in free-cutting steel using X-ray tomography Reviewed International journal

    D. Seo, H. Toda, M. Kobayashi, K. Uesugi, A. Takeuchi, Y. Suzuki

    ISIJ International   55 ( 7 )   1483 - 1488   2015.7

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    DOI: 10.2355/isijinternational.55.1483

    Repository Public URL: http://hdl.handle.net/2324/4149938

  • In situ observation of void nucleation and growth in a steel using X-ray tomography Reviewed International journal

    D. Seo, H. Toda, M. Kobayashi, K. Uesugi, A. Takeuchi, Y. Suzuki

    ISIJ International   55 ( 7 )   1474 - 1482   2015.7

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    DOI: 10.2355/isijinternational.55.1474

    Repository Public URL: http://hdl.handle.net/2324/4149937

  • Investigation of creep damage in advanced martensitic chromium steel weldments using synchrotron X-ray micro-tomography and EBSD Reviewed

    C. Schlacher, T. Pelzmann, C. Beal, C. Sommitsch, C. Gupta, H. Toda, P. Mayr

    MATERIALS SCIENCE AND TECHNOLOGY   31 ( 5 )   516 - 521   2015.3

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    DOI: 10.1179/1743284714Y.0000000621

  • Cavitation studies in materials New insights from modern techniques in 2D/3D/4D characterisation Reviewed

    C. Gupta, H. Toda, P. Mayr, C. Sommitsch

    Materials Science and Technology   31 ( 5 )   513 - 515   2015.3

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    DOI: 10.1179/0267083614Z.000000000853

  • 3D creep cavitation characteristics and residual life assessment in high temperature steels: a critical review Reviewed

    C. Gupta, H. Toda, P. Mayr, C. Sommitsch

    MATERIALS SCIENCE AND TECHNOLOGY   31 ( 5 )   603 - 626   2015.3

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    DOI: 10.1179/1743284714Y.0000000693

    Repository Public URL: http://hdl.handle.net/2324/1813032

  • Cavitation studies in materials: new insights from modern techniques in 2D/3D/4D characterisation Reviewed

    C. Gupta, H. Toda, P. Mayr, C. Sommitsch

    MATERIALS SCIENCE AND TECHNOLOGY   31 ( 5 )   513 - 515   2015.3

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    DOI: 10.1179/0267083614Z.000000000853

    Repository Public URL: http://hdl.handle.net/2324/4149934

  • Growth behavior of hydrogen micro pores in Al-Zn-Mg-Cu alloys during high temperature exposure Reviewed

    H. Su, H. Toda, K. Uesugi, A. Takeuchi, Y. Suzuki

    Proceedings of Materials Science & Technology 2015   - ( - )   1589 - 1593   2015.1

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    Growth behavior of hydrogen micro pores in Al-Zn-Mg-Cu alloys during high temperature exposure

  • Application of Diffraction-Amalgamated Grain Boundary Tracking to Fatigue crack propagation behavior in high strength aluminum alloy Reviewed

    H. Li, H. Toda, K. Uesugi, A. Takeuchi, Y. Suzuki, M. Kobayashi

    Materials Transactions   56 ( 3 )   424 - 428   2015.1

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    DOI: 10.2320/matertrans.M2014340

  • Formation behaviour of blister in cast aluminium alloy Reviewed

    H. Toda, P. C. Qu, S. Ito, K. Shimizu, K. Uesugi, A. Takeuchi, Y. Suzuki, M. Kobayashi

    INTERNATIONAL JOURNAL OF CAST METALS RESEARCH   27 ( 6 )   369 - 377   2014.12

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    DOI: 10.1179/1743133614Y.0000000123

  • Formation behaviour of blister in cast aluminium alloy Reviewed

    H. Toda, P. C. Qu, S. Ito, K. Shimizu, K. Uesugi, A. Takeuchi, Y. Suzuki, M. Kobayashi

    International Journal of Cast Metals Research   27 ( 6 )   369 - 377   2014.12

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    DOI: 10.1179/1743133614Y.0000000123

  • Al-7%Si合金の機械的性質に及ぼすP量の影響 Reviewed

    豊田充潤, 森中真行, 戸田裕之

    鋳造工学   86 ( 11 )   832 - 839   2014.11

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    DOI: 10.11279/jfes.86.832

  • 材料科学分野における最近のX線トモグラフィの進歩 Reviewed

    小林正和, 戸田裕之, 上杉健太朗, 竹内晃久, 鈴木芳生

    軽金属   64 ( 11 )   510 - 517   2014.11

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  • 低サイクル疲労を受けるアルミニウム鋳造合金の三次元き裂発生挙動 Reviewed

    桑水流理, 松村圭悟, アギアルデソウザヴィニシウス, 小林正和, 戸田裕之

    軽金属   64 ( 11 )   570 - 575   2014.11

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  • リバース4D材料エンジニアリングのためのイメージベース有限要素解析:水素ポアからの延性破壊 Reviewed

    細川明秀, 栗野貴輝, 戸田裕之, 上杉健太朗, 竹内晃久, 鈴木芳生

    軽金属   64 ( 11 )   611 - 612   2014.11

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  • Visualization of dual-phase structure in duplex stainless steel Reviewed International journal

    D.Seo, H Toda and M. Kobayashi

    Research Frontiers 2013   2014.8

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    Other Link: http://www.spring8.or.jp/pdf/en/res_fro/13/112_113.pdf

  • Application of Diffraction‐Amalgamated Grain Boundary Tracking (DAGT) to Fatigue Crack Propagation Behavior in High Strength Aluminum Alloy Reviewed

    H. Li, H. Toda, K. Uesugi, A. Takeuchi, Y. Suzuki, M. Kobayashi

    The 2nd International Congress on 3D Materials Science   - ( - )   91 - 96   2014.7

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    Application of Diffraction‐Amalgamated Grain Boundary Tracking (DAGT) to Fatigue Crack Propagation Behavior in High Strength Aluminum Alloy

  • Development of 3D crystallographic orientation measurement for grain deformation analysis in aluminum alloy Reviewed

    M. KOBAYASHI, H. TODA, D.J. LECLERE, T. KAMIKO, K. UESUGI, A. TAKEUCHI, Y. SUZUKI

    Transactions of Nonferrous Metals Society of China   24 ( 7 )   2094 - 2101   2014.7

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    DOI: 10.1016/s1003-6326(14)63317-3

  • Assessment of Deformation Behavior of Polycrystalline Aluminum Using Diffraction-Amalgamated Grain-Boundary Tracking (DAGT) Technique Reviewed

    Hiroyuki Toda, Takanobu Kamiko, Kentaro Uesugi, Akihisa Takeuchi, Yoshio Suzuki, Masakazu Kobayashi

    Materials Science Forum, Aluminum Alloys 2014 (ICAA14)   794-796 ( - )   57 - 62   2014.6

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    DOI: 10.4028/www.scientific.net/MSF.794-796.57

  • A Numerical Evaluation of an Infill Sampling Criterion in Artificial Neural Network-Based Optimization Reviewed

    Han Li, Leonardo Gutierrez, Masakazu Kobayashi, Osamu Kuwazuru, Hiroyuki Toda, Rafael Batres

    International Journal of Computer Theory and Engineering   6 ( 3 )   272 - 277   2014.6

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    A Numerical Evaluation of an Infill Sampling Criterion in Artificial Neural Network-Based Optimization

    DOI: 10.7763/ijcte.2014.v6.874

    Repository Public URL: https://hdl.handle.net/2324/7157420

  • A Method for the Identification of Mechanical Properties Using Surrogate Models Reviewed

    Leonardo Gutierrez, Han Li, Hiroyuki Toda, Masakazu Kobayashi, Osamu Kuwazuru, Rafael Batres

    International Journal of Computer Theory and Engineering   6 ( 3 )   234 - 239   2014.6

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    A Method for the Identification of Mechanical Properties Using Surrogate Models

    DOI: 10.7763/ijcte.2014.v6.868

  • Effect of micro-voids on crack initiation and propagation in bending deformation of Al-Mg-Si alloy sheet Reviewed International journal

    Y. Yamamoto, M. Asano, H. Yoshida, M. Kobayashi, H. Toda

    Materials Science Forum   794-796   325 - 330   2014.6

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    DOI: 10.4028/www.scientific.net/MSF.794-796.325

  • Al-Mg-Si系鋳物における溶体化・時効処理に流動層炉を利用するための基礎的検討 Reviewed

    小林正和, 綿貫雅敏, 杉浦協司, 竹下裕市, 戸田裕之

    鋳造工学   86 ( 3 )   209 - 215   2014.3

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    DOI: 10.11279/jfes.86.209

  • The True Origin of Ductile Fracture in Aluminum Alloys Reviewed

    Hiroyuki Toda, Hideyuki Oogo, Keitaro Horikawa, Kentaro Uesugi, Akihisa Takeuchi, Yoshio Suzuki, Mitsuru Nakazawa, Yoshimitsu Aoki, Masakazu Kobayashi

    METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE   45A ( 2 )   765 - 776   2014.2

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    DOI: 10.1007/s11661-013-2013-3

  • The true origin of ductile fracture in aluminum alloys Reviewed

    H. Toda, H. Oogo, K. Horikawa, K. Uesugi, A. Takeuchi, Y. Suzuki, M. Nakazawa, Y. Aoki, M. Kobayashi

    Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science   45 ( 2 )   765 - 776   2014.2

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    DOI: 10.1007/s11661-013-2013-3

  • Effects of Stress Triaxiality on Damage Evolution from Pre-Existing Hydrogen Pores in Aluminum Alloy Reviewed

    Hiroyuki Toda, Hideki Tsuruta, Keitaro Horikawa, Kentaro Uesugi, Akihisa Takeuchi, Yoshio Suzuki, Masakazu Kobayashi

    MATERIALS TRANSACTIONS   55 ( 2 )   383 - 386   2014.2

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    DOI: 10.2320/matertrans.L-M2013841

  • W-concentration 3D mapping in SKH51 steel by dual-energy K-absorption edge subtraction imaging Reviewed International journal

    M. Kobayashi, H. Toda, A. Takijiri, A. Takeuchi, Y. Suzuki, K. Uesugi

    ISIJ International   54 ( 1 )   141 - 147   2014.1

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    DOI: 10.2355/isijinternational.54.141

  • 放射光による炭素鋼表面に形成されたバイオフィルムと微生物腐食の3D可視化 Reviewed

    小林正和,飯村兼一,細川明秀,上杉健太朗,黒田大介,兼松秀行,戸田裕之

    Bacterial adherence & biofilm   28   67 - 70   2014.1

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  • Al-Mg-Si系鋳物における溶体化・時効処理に流動層炉を利用するための基礎的検討 Reviewed

    小林正和, 杉浦協司, 竹下裕市, 戸田裕之

    鋳造工学   Vol.86 ( No.3 )   209 - 215   2014.1

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  • Al-7%Si合金の機械的性質に及ぼすP量の影響 Reviewed

    豊田充潤, 森中真行, 戸田裕之

    鋳造工学   Vol.86 ( No.11 )   832 - 839   2014.1

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  • Three-dimensional crack initiation behavior of cast aluminum alloy under low-cycle fatigue Reviewed

    O. Kuwazuru, K. Matsumura, V. A. De Souza, M. Kobayashi, H. Toda

    Keikinzoku/Journal of Japan Institute of Light Metals   64 ( 11 )   570 - 575   2014.1

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    DOI: 10.2464/jilm.64.570

  • Simulation of deformation texture evolution in aluminum alloy based on local strain obtained by synchrotron 3D measurement Reviewed

    A. Kouno, M. Kobayashi, H. Toda, H. Miura

    Keikinzoku/Journal of Japan Institute of Light Metals   64 ( 11 )   557 - 563   2014.1

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    DOI: 10.2464/jilm.64.557

  • Reverse 4D materials engineering Its framework and recent evolution Reviewed

    H. Toda, R. Batres, O. Kuwazuru, M. Kobayashi, A. Hosokawa

    Keikinzoku/Journal of Japan Institute of Light Metals   64 ( 11 )   518 - 524   2014.1

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    DOI: 10.2464/jilm.64.518

  • Recent progress of X-ray tomography in material science field Reviewed

    M. Kobayashi, H. Toda, K. Uesugi, A. Takeuchi, Y. Suzuki

    Keikinzoku/Journal of Japan Institute of Light Metals   64 ( 11 )   510 - 517   2014.1

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    DOI: 10.2464/jilm.64.510

  • Image-based finite element analysis for reverse 4D materials engineering Ductile fracture originated from hydrogen pores Reviewed

    A. Hosokawa, T. Kurino, H. Toda, K. Uesugi, A. Takeuchi, Y. Suzuki

    Keikinzoku/Journal of Japan Institute of Light Metals   64 ( 11 )   611 - 612   2014.1

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    DOI: 10.2464/jilm.64.611

  • 浸炭層模擬材のき裂発生・伝播のその場観察 Reviewed

    戸田裕之, 井上圭介, 森田敏之, 中山恭平, 小林正和, 橋本保, 上杉健太朗

    SPring-8利用研究成果集   Vol. 2 ( No.1 )   110 - 113   2014.1

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  • Effects of hydrogen micro pores on mechanical properties in A2024 Aluminum alloys Reviewed International journal

    H. Toda, T. Inamori, K. Horikawa, K. Uesugi, A.Takeuchi, Y. Suzuki, M. Kobayashi

    Materials Transactions   54 ( 12 )   2195 - 2201   2013.12

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  • Al-Mg-Si系合金の曲げ変形初期の亀裂発生および伝播に及ぼすミクロボイドの影響 Reviewed

    山本裕介,浅野峰生,吉田英雄,小林正和,戸田裕之

    軽金属   63 ( 12 )   452 - 457   2013.12

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    DOI: 10.2464/jilm.63.452

  • 3D visualization of defects and microstructural features with laboratory-scale X-ray tomography apparatuses Reviewed

    H. Toda, M. Kobayashi, T. Kubo, K. Moizumi, D. Sugiyama, Y. Yamamoto, T. Harada, K. Hayashi, Y. Hangai, Y. Murakami

    Keikinzoku/Journal of Japan Institute of Light Metals   63 ( 10 )   343 - 349   2013.12

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    DOI: 10.2464/jilm.63.343

  • Relationship between resolution and rotation stage in imaging X-ray CT Reviewed

    M. Kobayashi, Y. Sugihara, H. Toda, K. Uesugi

    Keikinzoku/Journal of Japan Institute of Light Metals   63 ( 8 )   273 - 278   2013.11

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    DOI: 10.2464/jilm.63.273

  • 産業用X線トモグラフィー装置による材料欠陥およびミクロ組織の3D可視化 Reviewed

    戸田裕之, 小林正和, 久保 貴司, 茂泉 健, 杉山大吾, 山本裕介, 原田俊宏, 林憲司, 半谷禎彦, 村上雄一朗

    軽金属   63 ( 10 )   343 - 349   2013.10

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  • Micro-pore development phenomenon in hydrogen pre-charged aluminum alloy studied using synchrotron X-ray micro-tomography Reviewed

    C. Gupta, H. Toda, T. Fujioka, M. Kobayashi, K. Uesugi, A. Takeuchi, Y. Suzuki

    APPLIED PHYSICS LETTERS   103 ( 17 )   171902   2013.10

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    DOI: 10.1063/1.4826274

  • Study of creep damage in creep exposed martensitic high chromium steel weldments Reviewed International journal

    C. Schlacher, C. B?al, C. Sommitsch, H. Toda, P. Mayr

    Advances in Materials Technology for Fossil Power Plants - Proceedings from the 7th International Conference   914 - 923   2013.10

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  • 放射光トモグラフィーとX 線回折を組合せた3D 多結晶材料変形解析手法の開発 Reviewed

    小林正和, 大川嘉一, 戸田裕之, 上杉健太朗, 鈴木芳生, 竹内晃久

    日本金属学会誌   77 ( 9 )   375 - 384   2013.9

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  • Development of 3d deformation analysis method in polycrystalline metal by combining synchrotron radiation tomography with X-Ray diffraction Reviewed

    M. Kobayashi, Y. Ohkawa, H. Toda, K. Uesugi, Y. Suzuki, A. Takeuchi

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   77 ( 9 )   375 - 384   2013.9

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    DOI: 10.2320/jinstmet.J2013006

  • 結像型X線CTにおける回転ステージと分解能の関係 Reviewed

    小林正和, 杉原慶彦, 戸田裕之, 上杉健太朗

    軽金属   63 ( 5 )   273 - 278   2013.8

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  • Grain boundary tracking: A four-dimensional visualization technique for determining grain boundary geometry via local strain mapping Reviewed

    Hiroyuki Toda, Yoshikazu Ohkawa, Takanobu Kamiko, Takuma Naganuma, Kentaro Uesugi, Akihisa Takeuchi, Yoshio Suzuki, Masakazu Kobayashi

    ACTA MATERIALIA   61 ( 14 )   5535 - 5548   2013.8

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    DOI: 10.1016/j.actamat.2013.06.013

  • Compression and recovery micro-mechanisms in flexible graphite Reviewed

    Hiroyuki Toda, Kodai Tsubone, Kazuyuki Shimizu, Kentaro Uesugi, Akihisa Takeuchi, Yoshio Suzuki, Mitsuru Nakazawa, Yoshimitsu Aoki, Masakazu Kobayashi

    CARBON   59 ( - )   184 - 191   2013.8

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    DOI: 10.1016/j.carbon.2013.03.008

  • Study of creep damage in a 10.86% Cr heat resistant steel using synchrotron X-ray microtomography Reviewed International journal

    C. Gupta, H. Toda, C. Schlacher, P. Mayr, C. Sommitsch, K. Uesugi, Y. Suzuki, A. Takeuchi, M. Kobayashi

    Advanced Materials Research   794   476 - 483   2013.7

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  • 3D/4D fracture mechanics evaluation on shear band of aluminum alloys Reviewed

    K. Shimizu, Y. Sakaguchi, K. Sakai, H. Toda, K. Uesugi, A. Takeuchi, M. Kobayashi

    Keikinzoku/Journal of Japan Institute of Light Metals   63 ( 5 )   188 - 195   2013.7

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    DOI: 10.2464/jilm.63.188

  • Void growth and coalescence in model materials investigated by high-resolution X-ray microtomography Influence of work hardening behavior on ductility Reviewed

    A. Hosokawa, D. S. Wilkinson, J. Kang, M. Kobayashi, H. Toda

    International Journal of Fracture   181 ( 1 )   51 - 66   2013.5

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    DOI: 10.1007/s10704-013-9820-9

  • Cavitation during high-temperature deformation in Al-Mg alloys Reviewed

    Hiroyuki Toda, Zul Azri Bin Shamsudin, Kazuyuki Shimizu, Kentaro Uesugi, Akihisa Takeuchi, Yoshio Suzuki, Mitsuru Nakazawa, Yoshimitsu Aoki, Masakazu Kobayashi

    ACTA MATERIALIA   61 ( 7 )   2403 - 2413   2013.4

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    DOI: 10.1016/j.actamat.2013.01.012

  • Al-Cu二元系合金鋳物におけるCu濃度3Dマッピング Reviewed

    三瓶貴裕, 戸田裕之, 上杉健太朗, 竹内晃久, 鈴木芳生, 小林正和

    鋳造工学   85 ( 4 )   205 - 209   2013.4

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    DOI: 10.11279/jfes.85.205

  • Characterization of Cell Wall Microstructure and Damage Behavior of Alloyed Aluminum Foam via Synchrotron-Based Microtomography Reviewed

    Qiang Zhang, Hiroyuki Toda, Masakazu Kobayashi, Kentaro Uesugi, Yoshio Suzuki

    ADVANCED ENGINEERING MATERIALS   15 ( 3 )   149 - 152   2013.3

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    DOI: 10.1002/adem.201200142

  • Study of creep cavitation behavior in tempered martensitic steel using synchrotron micro-tomography and serial sectioning techniques Reviewed

    C. Gupta, H. Toda, C. Schlacher, Y. Adachi, P. Mayr, C. Sommitsch, K. Uesugi, Y. Suzuki, A. Takeuchi, M. Kobayashi

    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   564 ( - )   525 - 538   2013.3

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    DOI: 10.1016/j.msea.2012.12.002

  • 高温溶体化処理したAl-6Si-4Cu合金鋳物のポアと疲労特性の関係 Reviewed

    稲森隆晃, 戸田裕之, 小林正和, 中澤満, 青木義満, 高橋明宏

    鋳造工学   85 ( 2 )   69 - 75   2013.2

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  • Void growth and coalescence in model materials investigated by high-resolution X-ray microtomography: Influence of work hardening behavior on ductility Reviewed International journal

    A. Hosokawa, D.S. Wilkinson, L. Kang, M. Kobayashi, H. Toda

    International Journal of Fracture   181 ( 1 )   51 - 66   2013.1

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  • Effects of hydrogen micro pores on mechanical properties in a2024 aluminum alloys Reviewed

    H. Toda, Takaaki Inamori, K. Horikawa, K. Uesugi, A. Takeuchi, Y. Suzuki, M. Kobayashi

    Materials Transactions   54 ( 12 )   2195 - 2201   2013.1

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    DOI: 10.2320/matertrans.L-M2013832

  • Spatial resolution of synchrotron x-ray microtomography in high energy range: Effect of x-ray energy and sample-to-detector distance Reviewed

    D. Seo, F. Tomizato, H. Toda, K. Uesugi, A. Takeuchi, Y. Suzuki, M. Kobayashi

    Applied Physics Letters   101 ( 26 )   261901 - 261901   2012.12

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    DOI: 10.1063/1.4773239

  • Assessment of fatigue crack propagation behavior in aluminum alloy by in-situ high-resolution synchrotron X-ray microtomography Reviewed International journal

    H. Li, H. Toda, Y. Mizuseki, K.Uesugi, A. Takeuchi, Y. Suzuki, M. Kobayashi

    Proceedings of the International Symposium on Visualization in Joining & Welding Science through Advanced Measurements and Simulation, Joining and Welding Research Institute in Osaka Univ.   239 - 240   2012.11

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  • Time-resolved 3D measurements of mechanical behaviours in aluminium alloys Reviewed

    H. Toda

    Boof of abstracts of Asian Forum on Light Metals 2012   2012.11

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    Time-resolved 3D measurements of mechanical behaviours in aluminium alloys

  • In-situ observation of void growth and coalescence in free-cutting steel using synchrotron X-ray microtomography Reviewed International journal

    D. Seo, H. Toda, K. Kawakami, K. Uesugi, A. Takeuchi, Y. Susuki, M. Kobayashi

    Proceedings of the International Symposium on Visualization in Joining & Welding Science through Advanced Measurements and Simulation, Joining and Welding Research Institute in Osaka Univ.   235 - 236   2012.11

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  • Development of diffraction-amalgamated grain-boundary tracking technique and its application to polycrystalline metals Reviewed

    Hiroyuki Toda, Darren LeClere, Takanobu Kamiko, Yoshio Suzuki, Akihisa Takeuchi, Kentaro Uesugi, Masakazu Kobayashi

    Proc. SPIE 8506, Developments in X-Ray Tomography VIII   8506 ( 85060B )   1 - 8   2012.10

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    Development of diffraction-amalgamated grain-boundary tracking technique and its application to polycrystalline metals
    By amalgamating a transmission X-Ray diffraction (XRD) experiment with grain boundary tracking (GBT) that has been developed by the present authors by combining the X-ray micro-tomography (CT) and the gallium-enhanced grain boundary visualization techniques, a novel method which provides accurate crystallographic information of individual grains during deformation has been created. The developed technique, which is called diffraction-amalgamated grain boundary tracking (DAGT) technique, is non-destructive for in-situ characterizing of bulk materials, which allows for close to deformation and fracture analysis of metals. Employing near field XRD analysis with a thin collimated X-ray beam, the algorithms developed for DAGT identifies which diffraction spots are related to which grain; consequently, providing a description of the misorientation between grains. DAGT also realizes micron-level analysis of grain morphologies and local stain distribution in 3-dimensions (3D) on the basis of CT observation, enabling the crystallographic interpretation of localized deformation without being affected by blurring of diffraction spots caused by deformation. An Al-3mass&#37; Cu alloy was used for demonstration purpose.

    DOI: 10.1117/12.930608

  • Three-dimensional evaluation of the compression and recovery behavior in a flexible graphite sheet by synchrotron radiation microtomography Reviewed

    M. Kobayashi, H. Toda, A. Takeuchi, K. Uesugi, Y. Suzuki

    MATERIALS CHARACTERIZATION   69   52 - 62   2012.7

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    DOI: 10.1016/j.matchar.2012.04.008

  • Origin of ductile fracture in aluminum alloys Reviewed International journal

    H. Toda, H. Oogo, H. Tsuruta, K. Horikawa, K. Uesugi, A. Takeuchi, Y. Suzuki, M. Kobayashi

    Proceedings of 13th International Conference on Aluminum Alloys (ICAA13)   565 - 570   2012.6

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  • Creep and damage investigation of improved 9% Cr steel welded joints Reviewed International journal

    C. Schlacher, C. Sommitsch, P. Mayr, C. Gupta, H. Toda, K. Uesugi, Y. Suzuki

    ASM Proceedings of the International Conference: Trends in Welding Research   376 - 381   2012.6

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  • Diffraction-Amalgamated Grain-boundary Tracking (DAGT) technique and its application to an aluminum alloy Reviewed International journal

    D.J. LeClere, T. Kamiko, Y. Mizuseki, Y. Suzuki, A. Takeuchi, K. Uesugi, M. Kobayashi, H. Toda

    Proceedings of 13th International Conference on Aluminum Alloys   9 - 14   2012.6

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  • Analysis of creep cavitation in advanced 9-12%Cr steels using 3D characterisation techniques Reviewed International journal

    C. Gupta, H. Toda, Y. Adachi, M. Kobayashi, C. Schlacher, P. Mayr, C. Sommitsch, H. Hoshino, S. Yamauchi, K. Uesugi, Y. Suzuki, A. Takeuchi

    Proceedings of 12th International Conference on Creep and Fracture of Engineering Materials and Structures   CD-ROM (4 pages)   2012.5

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  • High-resolution Observation of Steel Using X-ray Tomography Technique Reviewed International journal

    H. Toda, F. Tomizato, F. Zeismann, Y. Motoyashiki-Besel, K. Uesugi, A. Takeuchi, Y. Suzuki, M. Kobayashi, A. Bruckner-Foit

    ISIJ International   52 ( 3 )   516 - 521   2012.3

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    DOI: 10.2355/isijinternational.52.516

  • Fatigue behaviour of hot worked cast aluminium alloys with different Si contents Reviewed

    M. Kobayashi, H. Hara, H. Toda, D. Sugiyama, N. Kuroda

    International Journal of Cast Metals Research   25 ( 1 )   31 - 37   2012.1

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    DOI: 10.1179/1743133611Y.0000000012

  • Synchrotron K-edge subtraction imaging and its application to metallic foams Reviewed

    Zhang Qiang, Hiroyuki Toda

    ACTA PHYSICA SINICA   60 ( 11 )   114103 - 114103   2011.11

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  • Improvement of thermo-mechanical fatigue properties in age-hardened aluminum alloys by controlling preferred orientation of precipitates Reviewed

    T. Sezume, H. Toda, M. Kobayashi, T. Fukunaga

    Keikinzoku/Journal of Japan Institute of Light Metals   61 ( 8 )   402 - 403   2011.10

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    DOI: 10.2464/jilm.61.402

  • 3D/4D strain mapping using in-situ X-ray microtomography Reviewed International journal

    H. Toda, K. Uesugi, Y. Suzuki, M. Kobayashi

    Applied Mechanics and Materials   70   249 - 254   2011.9

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    DOI: 10.4028/www.scientific.net/.249

  • High-precision analysis of internal deformation/fracture characteristics of a material by using submicron 3D CT images Reviewed

    M. Nakazawa, M. Kobayashi, H. Toda, Y. Aoki

    IEEJ Transactions on Industry Applications   131 ( 4 )   548 - 556+17   2011.9

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    DOI: 10.1541/ieejias.131.548

  • Characterization of inhomogeneous deformation behaviors in a flexible graphite sheet by a synchrotron radiation microtomography Reviewed International journal

    M. Kobayashi, H. Toda, A. Takeuchi, K. Uesugi, Y. Suzuki

    Proceedings of International Conference on Advanced Technology in Experimental Mechanics 2011   CD-ROM pp.1 - 7   2011.9

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  • 析出物配向制御による時効硬化型アルミニウム合金の熱疲労特性向上 Reviewed

    瀬詰知弘, 戸田裕之, 小林正和, 福永哲也

    軽金属   61 ( 8 )   402 - 403   2011.8

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    DOI: 10.2464/jilm.61.402

  • Statistical assessment of fatigue crack initiation from sub-surface hydrogen micropores in high-quality die-cast aluminum Reviewed

    Hiroyuki Toda, Shotaro Masuda, Rafael Batres, Masakazu Kobayashi, Shunzo Aoyama, Masato Onodera, Ryosuke Furusawa, Kentaro Uesugi, Akihisa Takeuchi, Yoshio Suzuki

    ACTA MATERIALIA   59 ( 12 )   4990 - 4998   2011.7

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    DOI: 10.1016/j.actamat.2011.04.049

  • Localized deformation during fracture of high-strength aluminum alloy Reviewed International journal

    H. Toda, A. Miyawaki, K. Uesugi, Y. Suzuki, M. Kobayashi

    Procedia Engineering   10   2598 - 2603   2011.6

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    DOI: 10.1016/j.proeng.2011.04.427

  • サブミクロン3D-CT画像を用いた材料内部の変形破壊特性解析の高精度化 Reviewed

    中澤満, 小林正和, 戸田裕之, 青木義満

    電気学会 論文誌D (産業応用部門誌)   131 ( 4 )   548 - 556   2011.4

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  • In situ observation of ductile fracture using X-ray tomography technique Reviewed

    H. Toda, E. Maire, S. Yamauchi, H. Tsuruta, T. Hiramatsu, M. Kobayashi

    ACTA MATERIALIA   59 ( 5 )   1995 - 2008   2011.3

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    DOI: 10.1016/j.actamat.2010.11.065

  • Dual energy K- edge subtraction imaging of 3D inhomogeneous microstructure in highly alloyed aluminium foam Reviewed International journal

    Q. Zhang, H. Toda

    Research Frontiers 2010   64 - 65   2011.3

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  • Application of Dual-Energy K-Edge Subtraction Imaging to Assessment of Heat Treatments in Al-Cu Alloys Reviewed

    Hiroyuki Toda, Kazuyuki Shimizu, Kentaro Uesugi, Yoshio Suzuki, Masakazu Kobayashi

    MATERIALS TRANSACTIONS   51 ( 11 )   2045 - 2048   2010.11

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    DOI: 10.2320/matertrans.L-M2010819

  • Growth behavior of hydrogen micro pores during ductile fracture of a 5154 aluminum alloy Reviewed

    H. Oogo, H. Toda, K. Uesugi, Y. Suzuki, M. Kobayashi

    Keikinzoku/Journal of Japan Institute of Light Metals   60 ( 8 )   409 - 410   2010.11

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    DOI: 10.2464/jilm.60.409

  • Hydrogen micro pores in cast aluminum alloys Reviewed International journal

    H. Toda, M. Kobayashi, K. Uesugi, Y. Suzuki

    Proceedings of 69th World Foundry Congress   49 - 53   2010.10

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  • Three-dimensional plastic strain mapping technique for X-ray micro-tomography Reviewed International journal

    M. Kobayashi, H. Toda, Y. Kawai, M. Nakazawa, Y. Aoki, K. Uesugi, Y. Suzuki

    Proceedings of Materials Scence & Technology   CD-ROM pp.1037 - 1044   2010.10

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  • Healing behavior of hydrogen micro pores during cold plastic deformation Reviewed International journal

    Z. A. Shamsudin, H. Toda, M. Kobayashi, K. Koyama, K. Ichitani, K. Uesugi

    Proceedings of Materials Scence & Technology   CD-ROM pp.1031 - 1036   2010.10

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  • Hydrogen micro pores and their affects on mechanical properties Reviewed International journal

    H. Toda, K. Uesugi, Y. Suzuki, M. Kobayashi

    Proceedings of the 12th International Conference on Aluminium Alloys   1353 - 1360   2010.9

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  • Image-based simulation of monotonic crack propagation through a 2024 aluminum alloy Reviewed International journal

    H. Tsuruta, H. Toda, P. Qu, M. Kobayashi, E. Maire

    Proceedings of the 12th International Conference on Aluminium Alloys   2275 - 2280   2010.9

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  • Development of three-dimensional plastic strain mapping technique for x-ray micro-tomography Reviewed International journal

    M. Kobayashi, H. Toda, Y. Kawai, M. Nakazawa, Y. Aoki, K. Uesugi, Y. Suzuki

    Proceedings of the 12th International Conference on Aluminium Alloys   1330 - 1335   2010.9

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  • Assessment of actual complicated fatigue crack propagation via 3D image-based numerical simulation Reviewed International journal

    P. Qu, H. Toda, H. Zhang, L. Qian, M. Kobayashi, K. Uesugi

    Proceedings of the 12th International Conference on Aluminium Alloys   1342 - 1346   2010.9

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  • Analysis of crack-tip stress field via observation of local crack extension by means of fast tomography technique Reviewed International journal

    S. Yamauchi, H. Toda, M. Kobayashi, T. Hiramatsu, E. Maire

    Proceedings of the 12th International Conference on Aluminium Alloys   2369 - 2374   2010.9

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  • 5154アルミニウム合金の延性破壊における水素ミクロポアの成長挙動 Reviewed

    大語英之, 戸田裕之, 上杉健太朗, 鈴木芳生, 小林正和

    軽金属   60 ( 8 )   409 - 410   2010.8

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  • Proposal of a method to analyze 3D deformation/fracture characteristics inside materials based on a stratified matching approach Reviewed

    Mitsuru Nakazawa, Masakazu Kobayashi, Hiroyuki Toda, Yoshimitsu Aoki

    MACHINE VISION AND APPLICATIONS   21 ( 5 )   687 - 694   2010.8

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    DOI: 10.1007/s00138-009-0242-7

  • Three-dimensional characterization of fatigue crack propagation behavior in an aluminum alloy using high resolution X-ray microtomography Reviewed International journal

    H. Zhang, P. C. Qu, Y. Sakaguchi, H. Toda, M. Kobayashi, K. Uesugi, Y. Suzuki

    Materials Science Forum   638-642   378 - 383   2010.8

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    DOI: 10.4028/www.scientific.net/MSF.638-642.378

  • Effect of local volume fraction of microporosity on tensile properties in Al-Si-Mg cast alloy Reviewed

    M. Kobayashi, Y. Dorce, H. Toda, H. Horikawa

    MATERIALS SCIENCE AND TECHNOLOGY   26 ( 8 )   962 - 967   2010.8

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    DOI: 10.1179/174328409X441283

  • Three-dimensional Visualization and Analysis of Grain Deformation by means of Synchrotron Radiation Reviewed International journal

    M. Kobayashi, H. Toda, K. Uesugi

    Materials Science Forum   638-642   2523 - 2528   2010.8

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    DOI: 10.4028/www.scientific.net/MSF.638-642.2523

  • 3D Characterisation of Grain Deformation under Synchrotron Radiation Reviewed International journal

    M. Kobayashi, H. Toda, K.Uesugi, A.Takeuchi, Y.Suzuki

    Materials Science Forum   654-656   2303 - 2306   2010.8

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    DOI: 10.4028/www.scientific.net/MSF.654-656.2303

  • 3D observation and image-based finite element analyses of fatigue crack propagation in an Al-Mg-Si alloy Reviewed International journal

    P. Qu, H. Toda, H. Zhang, L. Qian, M. Sakaguchi, M.Kobayashi, K. Uesugi

    Advanced Materials Research   89-91   449 - 454   2010.8

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    DOI: 10.4028/www.scientific.net/AMR.89-91.449

  • Three dimensional microstructure characterization of an Al-Zn-Mg alloy foam using synchrotron X-ray microtomography Reviewed International journal

    Q. Zhang, H. Toda, M. Kobayashi, Y. Suzuki, K. Uesugi

    Materials Science Forum   654-656   2358 - 2361   2010.8

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  • ミクロポアがアルミニウム合金ダイカストの強度・延性に及ぼす影響の統計的解析 Reviewed

    戸田裕之, 小林正和, 伊藤真也, 中澤満, 青木義満, 堀川宏, 鈴木聡

    鋳造工学   82 ( 7 )   427 - 432   2010.7

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  • Four-Dimensional Annihilation Behaviors of Micro Pores during Surface Cold Working Reviewed

    Hiroyuki Toda, Tomoyasu Yamaguchi, Mitsuru Nakazawa, Yoshimitsu Aoki, Kentaro Uesugi, Yoshio Suzuki, Masakazu Kobayashi

    MATERIALS TRANSACTIONS   51 ( 7 )   1288 - 1295   2010.7

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    DOI: 10.2320/matertrans.M2010069

  • Analysis of the relationship between material structures and auditoryimpressions Reviewed

    K. Sakamoto, S. Ishimitsu, T. Oda, Y. Sugiyama, H. Toda

    ICIC Express Letters   4 ( 3 )   691 - 696   2010.6

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  • Proposal of a method to analyze 3D deformation/fracture characteristics inside materials based on a stratified matching approach Reviewed International journal

    M. Nakazawa, M. Kobayashi, H. Toda, Y. Aoki

    Machine Vision and Applications   21 ( 5 )   687 - 694   2010.5

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  • 表面冷間加工処理を施したAC4Bアルミニウム合金鋳物の熱機械疲労特性 Reviewed

    戸田裕之, 小林正和, 新原智晴, 山田徹, 大場義夫, 柿崎みな子

    軽金属   60 ( 4 )   190 - 191   2010.4

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  • Thermo-mechanical fatigue property of a surface-hardened AC4B cast aluminum alloy Reviewed

    H. Toda, M. Kobayashi, T. Niihara, T. Yamada, Y. Ooba, M. Kakizaki

    Keikinzoku/Journal of Japan Institute of Light Metals   60 ( 4 )   190 - 191   2010.4

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    DOI: 10.2464/jilm.60.190

  • Analysis of the relationship between material structures and auditory impressions Reviewed International journal

    K. Sakamoto, S. Ishimitsu, T. Oda, Y. Sugiyama, H. Toda

    ICIC Express Letters   4 ( 3 )   691 - 696   2010.4

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  • Assessment of 3D inhomogeneous microstructure of highly alloyed aluminium foam via dual energy K-edge subtraction imaging Reviewed International journal

    Q. Zhang, H. Toda, Y. Takami, Y. Suzuki, K. Uesugi, M. Kobayashi

    Philosophical Magazine   90 ( 14 )   1853 - 1871   2010.4

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    DOI: 10.1080/14786430903571438

  • Influence of high-temperature solution treatments on mechanical properties of an Al-Si-Cu aluminum alloy Reviewed

    Hiroyuki Toda, Takanori Nishimura, Kentaro Uesugi, Yoshio Suzuki, Masakazu Kobayashi

    ACTA MATERIALIA   58 ( 6 )   2014 - 2025   2010.4

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    DOI: 10.1016/j.actamat.2009.11.044

  • Al-Mg-Si系合金の時効硬化挙動に及ぼす急速昇温の効果 Reviewed

    戸田裕之, 本江真之, 角海和宏, 中山栄浩, 小林正和, 小林俊郎

    軽金属   59 ( 10 )   569 - 575   2009.10

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  • Effects of up-quenching on age-hardening behaviors in Al-Mg-Si alloys Reviewed

    H. Toda, M. Motoe, K. Kadoumi, Y. Nakayama, M. Kobayashi, T. Kobayashi

    Keikinzoku/Journal of Japan Institute of Light Metals   59 ( 10 )   569 - 575   2009.10

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    DOI: 10.2464/jilm.59.569

  • Healing behavior of preexisting hydrogen micropores in aluminum alloys during plastic deformation Reviewed

    H. Toda, K. Minami, K. Koyama, K. Ichitani, M. Kobayashi, K. Uesugi, Y. Suzuki

    ACTA MATERIALIA   57 ( 15 )   4391 - 4403   2009.9

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    DOI: 10.1016/j.actamat.2009.06.012

  • Local crack driving force analysis of a fatigue crack by a microstructural tracking method Reviewed

    P. Qu, H. Toda, H. Zhang, Y. Sakaguchi, L. Qian, M. Kobayashi, K. Uesugi

    SCRIPTA MATERIALIA   61 ( 5 )   489 - 492   2009.9

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    DOI: 10.1016/j.scriptamat.2009.05.004

  • Roles of Pre-Existing Hydrogen Micropores on Ductile Fracture Reviewed

    Hiroyuki Toda, Hideyuki Oogo, Kentaro Uesugi, Masakazu Kobayashi

    MATERIALS TRANSACTIONS   50 ( 9 )   2285 - 2290   2009.9

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    DOI: 10.2320/matertrans.M2009123

    Repository Public URL: http://hdl.handle.net/2324/4149933

  • Three-dimensional fatigue crack growth behavior in an aluminum alloy investigated with in situ high-resolution synchrotron X-ray microtomography Reviewed

    H. Zhang, H. Toda, P. C. Qu, Y. Sakaguchi, M. Kobayashi, K. Uesugi, Y. Suzuki

    ACTA MATERIALIA   57 ( 11 )   3287 - 3300   2009.6

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    DOI: 10.1016/j.actamat.2009.03.036

  • Thermal fatique fracture of materials Reviewed

    H. Toda, M. Kobayashi

    Keikinzoku/Journal of Japan Institute of Light Metals   59 ( 6 )   312 - 319   2009.6

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    DOI: 10.2464/jilm.59.312

  • Growth behavior of hydrogen micropores in aluminum alloys during high-temperature exposure Reviewed

    H. Toda, T. Hidaka, M. Kobayashi, K. Uesugi, A. Takeuchi, K. Horikawa

    ACTA MATERIALIA   57 ( 7 )   2277 - 2290   2009.4

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    DOI: 10.1016/j.actamat.2009.01.026

    Repository Public URL: http://hdl.handle.net/2324/1813034

  • Improvement of thermomechanical fatigue life in an age-hardened aluminum alloy Reviewed

    H. Toda, T. Fukunaga, A. Kobayashi

    SCRIPTA MATERIALIA   60 ( 6 )   385 - 387   2009.3

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    DOI: 10.1016/j.scriptamat.2008.11.005

  • 4-D observation of metal forming process Reviewed International journal

    H. Toda, K. Koyama, K. Ichitani, M. Kobayashi

    Proceedings of the 28th. Colloquium on Metal Forming   239 - 247   2009.2

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  • 放射光を用いた投影およびイメージングCTによる2024アルミニウム合金中のミクロポアの3D観察 Reviewed

    小林正和, 戸田裕之, 南恵介, 森豊和, 上杉健太朗, 竹内晃久, 鈴木芳生

    軽金属   59 ( 1 )   30 - 34   2009.1

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  • Three-dimensional observation of micro-pores in a 2024 aluminum alloy by synchrotron X-ray projection- And imaging-type microtomography techniques Reviewed

    M. Kobayashi, H. Toda, K. Minami, T. Mori, K. Uesugi, A. Takeuchi, Y. Suzuki

    Keikinzoku/Journal of Japan Institute of Light Metals   59 ( 1 )   30 - 34   2009.1

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    DOI: 10.2464/jilm.59.30

  • Local crack driving force analysis of a fatigue crack by a microstructural tracking method Reviewed International journal

    P. Qu, H. Toda, H. Zhang, Y. Sakaguchi, L. Qian, M. Kobayashi, K. Uesugi

    Scripta Materialia   60   489 - 492   2009.1

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  • Direct measurement procedure for three-dimensional local crack driving force using synchrotron X-ray microtomography Reviewed

    H. Toda, S. Yamamoto, M. Kobayashi, K. Uesugi, H. Zhang

    ACTA MATERIALIA   56 ( 20 )   6027 - 6039   2008.12

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    DOI: 10.1016/j.actamat.2008.08.022

  • 3D image analysis for evaluating internal deformation/fracture characteristics of materials Reviewed

    Mitsuru Nakazawa, Yoshimitsu Aoki, Masakazu Kobayashi, Hiroyuki Toda

    2008 19th International Conference on Pattern Recognition (ICPR 2008)   1   978-1-4244-2175-6   2008.12

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    3D image analysis for evaluating internal deformation/fracture characteristics of materials

    DOI: 10.1109/icpr.2008.4761648

  • 3D image analysis for evaluating internal deformation/fracture characteristics of materials Reviewed

    M. Nakazawa, Y. Aoki, H. Toda, M. Kobayashi

    Electronics and Communications in Japan, Part II: Electronics (English translation of Denshi Tsushin Gakkai Ronbunshi)   91 ( 12 )   16 - 23   2008.12

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    DOI: 10.1002/ecj.1005

  • 3D image analysis for evaluating internal deformation / fracture characteristics of materials Reviewed International journal

    M. Nakazawa, Y. Aoki, M. Kobayashi, H. Toda

    Proceedings of the nineteenth conference of the International Association for Pattern Recognition (IAPR).   978-1-4244-2175-6   2008.12

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  • 摩擦撹拌プロセスによる異種金属複合材料の創製 Reviewed

    小林正和, 藤滝幸太郎, 戸田裕之, 安井利明, 福本昌宏, 椿正巳

    軽金属   58 ( 10 )   524 - 525   2008.10

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  • Production of dissimilar metal composite by friction stir processing Reviewed

    M. Kobayashi, K. Fujitaki, H. Toda, T. Yasui, M. Fukumoto, M. Tsubaki

    Keikinzoku/Journal of Japan Institute of Light Metals   58 ( 10 )   524 - 525   2008.10

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    DOI: 10.2464/jilm.58.524

  • Three-dimensional characterization of fatigue crack propagation behavior in an aluminum alloy using high resolution X-Ray microtomography Reviewed International journal

    H. Zhang, P. Qu, Y. Sakaguchi, H. Toda, M. Kobayashi, K. Uesugi, Y. Suzuki

    Proceedings of the Materials Science and Technology Conference and Exhibition, MS and T'08   1107 - 1116   2008.10

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  • 3D image-based analyses of fatigue crack propagation in an Al-Mg-Si alloy Reviewed International journal

    P. Qu, H. Toda, H. Zhang, L. Qian, M. Sakaguchi, M. Kobayashi, K. Uesugi

    Proceedings of the Materials Science and Technology Conference and Exhibition, MS and T'08   600 - 609   2008.10

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  • 3-D microstructural characterization of cell wall in a high strength aluminium foam Reviewed International journal

    H. Toda, Y. Takami, M. Kobayashi, T. Kobayashi, Y. Aruga, T. Takagi, Y. Suzuki, K. Uesugi

    Proceedings of International Conference on Porous Metals and Metallic Foams 2007: Porous Metals and Metallic Foams   445 - 448   2008.9

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  • Synchrotron-based dual energy K-edge subtraction imaging for three-dimensional concentration mapping Reviewed International journal

    K. Shimizu, H. Toda, M. Kobayashi, K. Uesugi, Y. Suzuki, T. Kobayashi

    Proceedings of the 11th International Conference on Aluminium Alloys   868 - 873   2008.9

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  • Three-dimensional analysis of grain deformation in Al-Cu alloy by means of high-resolution X-ray computed tomography Reviewed International journal

    M. Kobayashi, H. Toda, Y. Ohkawa, K. Uesugi, T. Kobayashi

    Proceedings of the 11th International Conference on Aluminium Alloys   680 - 685   2008.9

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  • 3-D tracking of hydrogen micro-pores during aluminium production process Reviewed International journal

    H. Toda, T. Hidaka, K. Minami, M. Kobayashi, K. Uesugi, Y. Suzuki, T. Kobayashi

    Proceedings of the 11th International Conference on Aluminium Alloys   575 - 581   2008.9

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  • 3D image analysis for evaluating internal deformation / fracture characteristics of materials Reviewed International journal

    M. Nakazawa, Y. Aoki, M. Kobayashi, H. Toda

    Proceedings of the Third Asia International Symposium on Mechatronics   87 - 90   2008.8

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  • Change in microstructure of Al-Si-Cu casting alloys during high temperature solution treatment Reviewed

    T. Nishimura, H. Toda, M. Kobayashi, T. Kobayashi, K. Uesugi, Y. Suzuki

    INTERNATIONAL JOURNAL OF CAST METALS RESEARCH   21 ( 1-4 )   114 - 118   2008.8

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    Change in microstructure of Al-Si-Cu casting alloys during high temperature solution treatment
    The solution treatment in Al-Si system casting alloys is usually performed to obtain supersaturated solid solution and spheroidising Si particles. It can be inferred that a high temperature solution treatment enhances mechanical properties without any special apparatuses or techniques. However, it is well known that the solution treatment close to an eutectic temperature causes local melting. In this study, the change in microstructure of Al-Si-Cu casting alloys, which have been solution treated at temperatures ranging from 773 to 824 K, have been investigated from a viewpoint of Cu concentration and the distributions of micropores and locally melt regions due to eutectic reaction. Tensile and hardness tests were carried out to discuss the relationship between mechanical properties and microstructures. In addition to a surface observation, an internal microstructural observation was carried out using the high resolution X-ray computed tomography. The burnt regions during the high temperature solution treatment were identified to be Cu rich. Porosity increased with increasing the solution treatment temperature. The porosity in the sample solution treated above a binary eutectic temperature was confirmed to be >0.2 vol.-&#37;. The Cu concentration in the alpha-phase increased below the binary eutectic temperature.

    DOI: 10.1179/136404608X361783

  • Visualization by X-ray tomography of void growth and coalescence leading to fracture in model materials Reviewed

    A. Weck, D. S. Wilkinson, E. Maire, H. Toda

    ACTA MATERIALIA   56 ( 12 )   2919 - 2928   2008.7

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    DOI: 10.1016/j.actamat.2008.02.027

  • Erratum to "Quantitative assessment of liquid Ga penetration into an aluminium alloy by high-resolution X-ray tomorgarphy" [Mater. Sci. Eng. A, 427 (2006) 1-6] (DOI:10.1016/j.msea.2005.07.050) Reviewed

    Materials Science and Engineering A   486 ( 1-2 )   699   2008.7

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    DOI: 10.1016/j.msea.2007.11.007

  • 表面冷間加工処理を施したAC4CHアルミニウム合金鋳物の熱機械疲労特性 Reviewed

    戸田裕之, 福永哲也, 小林正和, 上杉健太朗, 小林俊郎, 山田徹, 大場義夫, 柿崎みな子

    軽金属   58 ( 6 )   236 - 241   2008.6

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  • Thermo-mechanical fatigue property of a surface-hardened AC4CH cast aluminum alloy Reviewed

    H. Toda, T. Fukunaga, M. Kobayashi, K. Uesugi, T. Kobayashi, T. Yamada, Y. Ooba, M. Kakizaki

    Keikinzoku/Journal of Japan Institute of Light Metals   58 ( 6 )   236 - 241   2008.6

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    DOI: 10.2464/jilm.58.236

  • Fatigue properties of bovine compact bones that have different microstructures  Reviewed International journal

    J.H. Kim, M. Niinomi, T. Akahori, H. Toda

    International Journal of Fatigue   29 ( 6 )   1039 - 1050   2008.6

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  • Three-dimensional visualization of ductile fracture in an Al-Si alloy by high-resolution synchrotron X-ray microtomography Reviewed

    L. Qian, H. Toda, K. Uesugi, T. Ohgaki, M. Kobayashi, T. Kobayashi

    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   483-484   293 - 296   2008.6

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    Three-dimensional visualization of ductile fracture in an Al-Si alloy by high-resolution synchrotron X-ray microtomography
    A direct three-dimensional visualization of the ductile fracture process under monotonic loading, in an Al-Si-Mg alloy specimen containing a fatigue pre-crack, has been conducted by means of the high-resolution X-ray computed tomography. Different morphology features of the crack viewed on different cross sections within the bulk of the specimen are detected. The isolated voids are distinguished from the microcracks. The evolution of the crack and voids as a function of the applied load are monitored and analyzed three-dimensionally. The advantages of the technique over traditional cross sectional observations are demonstrated, which facilitates to understand the fracture mechanisms in ductile materials, and to elucidate the fracture/microstructure interaction in non-uniform mediums. (C) 2007 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.msea.2006.10.201

  • High-density three-dimensional mapping of internal strain by tracking microstructural features Reviewed

    Masakazu Kobayashi, Hiroyuki Toda, Yuji Kawai, Tomomi Ohgaki, Kentaro Uesugi, David S. Wilkinson, Toshiro Kobayashi, Yoshimitsu Aoki, Mitsuru Nakazawa

    ACTA MATERIALIA   56 ( 10 )   2167 - 2181   2008.6

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    DOI: 10.1016/j.actamat.2007.12.058

  • Surface hardening of biomedical Ti-29Nb-13Ta-4.6Zr and Ti-6Al-4V ELI by gas nitriding Reviewed

    Masaaki Nakai, Mitsuo Niinomi, Toshikazu Akahori, Naofumi Ohtsu, Hideki Nishimura, Hiroyuki Toda, Hisao Fukui, Michiharu Ogawa

    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   486 ( 1-2 )   193 - 201   2008.6

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    DOI: 10.1016/j.msea.2007.08.065

  • Application of high resolution microtomography to cast aluminium alloys Reviewed International journal

    H. Toda, T. Hidaka, M. Kobayashi, T. Kobayashi, K. Uesugi, Y. Suzuki

    Proceedings of The 10th Asian Foundry Congress   121 - 127   2008.5

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  • Change in microstructure of Al-Si-Cu casting alloys during high-temperature solution treatment Reviewed International journal

    T. Nishimura, H. Toda, M. Kobayashi, T. Kobayashi, K. Uesugi, Y. Suzuki

    International Jounal of Cast Metals Research   Vol.21   118 - 114   2008.4

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  • Direct observation and image-based simulation of three-dimensional tortuous crack evolution inside opaque materials Reviewed

    Lihe Qian, Hiroyuki Toda, Kentaro Uesugi, Masakazu Kobayashi, Toshiro Kobayashi

    PHYSICAL REVIEW LETTERS   100 ( 11 )   115505 - 115505   2008.3

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    DOI: 10.1103/PhysRevLett.100.115505

  • 屈折コントラストイメージングによるAl–7%Si 合金鋳物の延性破壊過程の3D 観察 Reviewed

    日高達真, 戸田裕之, 小林正和, 上杉健太朗, 小林俊郎

    軽金属   58 ( 2 )   58 - 64   2008.2

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  • Three-dimensional observation of ductile fracture process by deflection contrast imaging in cast Al-7%Si alloys Reviewed

    T. Hidaka, H. Toda, M. Kobayashi, K. Uesugi, T. Kobayashi

    Keikinzoku/Journal of Japan Institute of Light Metals   58 ( 2 )   58 - 64   2008.2

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    DOI: 10.2464/jilm.58.58

  • Change in microstructure of Al-Si-Cu casting alloys during high-temperature solution treatment Reviewed International journal

    T. Nishimura, H. Toda, M. Kobayashi, T. Kobayashi, K. Uesugi, Y. Suzuki

    International Jounal of Cast Metals Research   21 ( 1-4 )   114 - 118   2008.1

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  • 3D image analysis for evaluating internal deformation / fracture characteristics of materials Reviewed International journal

    M. Nakazawa, Y. Aoki, M. Kobayashi, H. Toda, Y. Kawai

    Proceedings of the International Workshop on Advanced Image Technology 2008   B2 - B4   2008.1

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  • Wavelet-based local region-of-interest reconstruction for synchrotron radiation x-ray microtomography Reviewed

    Lingqi Li, Hiroyuki Toda, Tomomi Ohgaki, Masakazu Kobayashi, Toshiro Kobayashi, Kentaro Uesugi, Yoshio Suzuki

    JOURNAL OF APPLIED PHYSICS   102 ( 11 )   114908   2007.12

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    DOI: 10.1063/1.2818374

  • Three-dimensional Zinc mapping inside aluminum foams using synchroteon X-ray microtomography Reviewed International journal

    T. Ohgaki, Y. Takami, H. Toda, T. Kobayashi, Y. Suzuki, K. Uesugi, K. Makii, T. Takagi, Y. Aruga

    Materials Science Forum   561-565   1677 - 1680   2007.11

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  • 3D image-based modeling of ductile fracture in an aluminum alloy using synchrotron X-ray CT images Reviewed International journal

    L. Qian, H. Toda, K. Uesugi, M. Kobayashi, T. Kobayashi

    Materials Science Forum   561-565   263 - 266   2007.11

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  • Hard-ceramic layer formed on Ti-29Nb-13Ta-4.6Zr and Ti-6Al-4V ELI during Gas Nitriding Reviewed International journal

    M. Nakai, M. Niinomi, T. Akahori, N. Ohtsu, H. Nishimura, H. Toda, H. Fukui, M. Ogawa

    Materials Science Forum   561-565   1509 - 1512   2007.11

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  • 3D image analysis for evaluating internal deformation / fracture characteristics of materials Reviewed International journal

    M. Nakazawa, Y. Aoki, M. Kobayashi, H. Toda, Y. Kawai

    Proceedings of the International Symposium on Optomechatronic Technologies   Vol. 6718   67180C-1 - 67180C-8   2007.10

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  • 3D image analysis for evaluating internal deformation / fracture characteristics of materials Reviewed International journal

    M. Nakazawa, Y. Aoki, M. Kobayashi, H. Toda, Y. Kawai

    Proceedings of the First International Symposium on Information and Computer Elements   76 - 81   2007.9

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  • Wavelet-based local tomography algorithm for high-resolution synchrotron radiation X-ray imaging Reviewed International journal

    L. Li, H. Toda, T. Ohgaki, M. Kobayashi, T. Kobayashi, K. Uesugi, Y. Suzuki

    Proceedings of Materials Science and Technology 2007   163 - 174   2007.9

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  • Three-dimensional visualization of the interaction between fatigue crack and micropores in an aluminum alloy using synchrotron X-ray microtomography Reviewed

    H. Zhang, H. Toda, H. Hara, M. Kobayashi, T. Kobayashi, D. Sugiyama, N. Kuroda, K. Uesugi

    METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE   38A ( 8 )   1774 - 1785   2007.8

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    DOI: 10.1007/s11661-007-9214-6

  • 3-D strain mapping inside materials by microstructural tracking in tomographic volumes Reviewed International journal

    H. Toda, M. Kobayashi, K. Uesugi, D.S. Wilkinson, T. Kobayashi

    Proceedings of MATERIALS CHARACTERISATION 2007 Computational Methods and Experiments in Materials Characterisation III   177 - 186   2007.6

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  • Fatigue properties of bovine compact bones that have different microstructures Reviewed

    J. H. Kim, M. Niinomi, T. Akahori, H. Toda

    INTERNATIONAL JOURNAL OF FATIGUE   29 ( 6 )   1039 - 1050   2007.6

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    DOI: 10.1016/j.ijfatigue.2006.09.018

  • Development of Titanium alloy for mouthpieceof brass instrument and its precision casting process Reviewed International journal

    M. Niinomi, T. Akahori, T. Nozaki, M. Nakai, S. Horihata, T. Suzuki, K. Watanabe, K. Sone, H. Toda

    Ti-2007 Science and Technology, ed. By M. Niinomi, S. Akiyama, M. Ikeda, M. Hagiwara and K. Maruyama, the Japan Institute of Materials   1571 - 1574   2007.6

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  • Three-dimensional measurement of local strain distribution by tracking microstructural features in high-resolution SR-CT image Reviewed

    M. Kobayashi, H. Toda, T. Ohgaki, K. Uesugi, D. S. Wilkinson, T. Kobayashi, Y. Aoki

    Key Engineering Materials   345-346 II   1153 - 1156   2007.5

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  • ガス窒化処理による生体用Ti-29Nb-13Ta-4.6Zr合金およびTi-6Al-4V ELI合金表面の硬質皮膜生成に及ぼす合金元素の影響 Reviewed

    仲井正昭, 新家光雄, 赤堀俊和, 大津直史, 西村英樹, 戸田裕之, 福井壽男, 小川道治

    日本金属学会誌   71 ( 4 )   415 - 422   2007.4

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  • Effects of alloying elements on hard ceramic layer formation on surfaces of biomedical Ti-29Nb-13Ta-4.6Zr and Ti-6Al-4V ELI during gas nitriding Reviewed

    M. Nakai, M. Niinomi, T. Akahori, N. Ohtsu, H. Nishimura, H. Toda, H. Fukui, M. Ogawa

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   71 ( 4 )   415 - 422   2007.4

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    DOI: 10.2320/jinstmet.71.415

  • 異種金属切削粉からなる強加工in-situ複合材料のミクロ組織形成過程 Reviewed International journal

    戸田裕之, 小林俊郎, 小林正和, 澤村純平, 小宅勝

    日本金属学会誌   71 ( 3 )   368 - 377   2007.3

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  • Microstructural evolution in heavily deformed in-situ composites produced from cutting-chip mixtures of dissimilar metals Reviewed

    H. Toda, T. Kobayashi, M. Kobayashi, J. Sawamura, M. Oyake

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   71 ( 3 )   368 - 377   2007.3

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    DOI: 10.2320/jinstmet.71.368

  • Preferential orientation of precipitates during thermomechanical cyclic loading in an aluminum alloy Reviewed

    M. Toyoda, H. Toda, H. Ikuno, T. Kobayashi, M. Kobayashi, K. Matsuda

    SCRIPTA MATERIALIA   56 ( 5 )   377 - 380   2007.3

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    DOI: 10.1016/j.scriptamat.2006.11.005

  • 放射光X線CTによる発泡Al-Zn-Mg合金の微細構造での熱処理の影響評価 Reviewed

    庄山和輝, 戸田裕之, 大垣智巳, 小林俊郎

    鋳造工学   79 ( 2 )   101 - 106   2007.2

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  • Measurement of 3-D strain distribution by means of high-resolution X-ray CT image and tracking of microstructural features Reviewed

    M. Kobayashi, H. Toda, Y. Kawai, T. Kobayashi, K. Uesugi, D. S. Wilkinson, E. Maire, Y. Aoki

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   71 ( 2 )   181 - 186   2007.2

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    DOI: 10.2320/jinstmet.71.181

  • 材料内部の変形破壊特性評価のための3次元画像解析 Reviewed

    中澤満, 青木義満, 小林正和, 戸田裕之

    電気学会論文誌C   127 ( 6 )   824 - 830   2007.1

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  • 3D image analysis for evaluating internal deformation / Fracture characteristics of materials Reviewed

    M. Nakazawa, Y. Aoki, H. Toda, M. Kobayashi

    IEEJ Transactions on Electronics, Information and Systems   127 ( 6 )   824 - 830+2   2007.1

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  • Three-dimensional measurement of local strain distribution by tracking microstructural features in high-resolution SR-CT image Reviewed International journal

    M. Kobayashi, H. Toda, T. Ohgaki, K. Uesugi, D.S. Wilkinson, T. Kobayashi, Y. Aoki

    Key Engineering Materials   345-346   1153 - 1156   2007.1

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  • Feasibility study on smart coating for failure prevention under thermo-mechanical fatigue loading Reviewed

    Hiroyuki Toda, Michihiro Toyoda, Toshiro Kobayashi, Toshikazu Akahori, Mitsuo Niinomi

    JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES   17 ( 12 )   1099 - 1103   2006.12

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    DOI: 10.1177/1045389X06065235

  • 3D image analysis for evaluating internal deformation / fracture characteristics of materials Reviewed International journal

    M. Nakazawa, Y. Aoki, M. Kobayashi, H. Toda, Y. Kawai

    Proceedings of the 32nd Annual Conference of the IEEE Industrial Electronics Society   3525 - 3530   2006.11

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  • Three-dimensional observation of nanoscopic precipitates in an aluminum alloy by microtomography with Fresnel zone plate optics Reviewed

    H. Toda, K. Uesugi, A. Takeuchi, K. Minami, M. Kobayashi, T. Kobayashi

    APPLIED PHYSICS LETTERS   89 ( 14 )   143112 - 143112   2006.10

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    DOI: 10.1063/1.2359288

  • Experimental and numerical investigations of the effects of the spatial distribution of α phase on fracture behavior in hypoeutectic Al-Si alloys Reviewed

    L. Qian, H. Toda, S. Nishido, T. Kobayashi

    Acta Mater.   54 ( 18 )   4881 - 4893   2006.10

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    Experimental and numerical investigations of the effects of the spatial distribution of alpha phase on fracture behavior in hypoeutectic Al-Si alloys
    A uniform, fine a phase microstructure enhances the mechanical properties of Al-Si alloys; however, it is an open question as to how the alpha phase affects the crack growth behavior. This paper addresses the effects of the morphology and distribution of alpha phase on the fracture behavior in a model dual-phase Al-7&#37; Si alloy with different microstructures. The influences of microstructural factors on crack growth behavior are examined using in situ experiments. The results show that a globular alpha phase microstructure produces a straight crack growth path, whereas a dendritic, orientational alpha phase microstructure leads to a deflected crack profile. Finite-element modeling is performed to simulate the fracture behavior, and to rationalize the observed phenomena. The near-tip J-integral-based fracture criterion is used to predict the fracture path. Numerical results indicate that a variation in the morphology and distribution of alpha phase changes the symmetry and intensity of the near-tip stress, strain and displacement fields due to the strong mismatch in elastic plastic properties of the a phase and eutectic phase, which have major influences on both crack growth direction and crack tip driving force. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.actamat.2006.06.036

  • Preferential penetration path of gallium into grain boundary in practical aluminium alloy Reviewed

    M. Kobayashi, H. Toda, K. Uesugi, T. Ohgaki, T. Kobayashi, Y. Takayama, B. -G. Ahn

    PHILOSOPHICAL MAGAZINE   86 ( 28 )   4351 - 4366   2006.10

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    DOI: 10.1080/14786430600710933

  • In situ observations of compressive behaviour of aluminium foams by local tomography using high-resolution X-rays Reviewed

    T. Ohgaki, H. Toda, M. Kobayashi, K. Uesugi, M. Niinomi, T. Akahori, T. Kobayash, K. Makii, Y. Aruga

    PHILOSOPHICAL MAGAZINE   86 ( 28 )   4417 - 4438   2006.10

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    DOI: 10.1080/14786430600724454

  • 3-D microstructural observation by means of sub-micrometer-resolution imaging micro-tomography Reviewed International journal

    H. Toda, K. Minami, M. Kobayashi, K. Uesugi, A. Takeuchi, T. Kobayashi

    Proceedings of the 16th International Microscopy Congress, Vol.3   240 - 242   2006.9

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  • 2D and 3D visualization of ductile fracture Reviewed International journal

    A. Weck, D.S. Wilkinson, H. Toda, E. Maire

    Advanced Engineering Materials   8 ( 6 )   469 - 472   2006.9

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  • 材料内部の変形・破壊特性評価のための3次元画像解析  Reviewed

    中澤満, 青木義満, 川井祐児, 小林正和, 戸田裕之

    30 ( 17 )   21 - 24   2006.8

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  • Observation of precipitates in aluminum alloys by sub-micrometer resolution tomography using Fresnel zone plate Reviewed International journal

    H. Toda, K. Minami, M. Kobayashi, K. Uesugi, A. Takeuchi, T. Kobayashi

    Materials Science Forum   519-521   1361 - 1366   2006.7

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  • Quantitative assessment of liquid Ga penetration into an aluminium alloy by high-resolution X-ray tomography Reviewed

    T Ohgaki, H Toda, Sinclair, I, JY Buffiere, W Ludwig, T Kobayashi, M Niinomi, T Akahori

    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   427 ( 1-2 )   1 - 6   2006.7

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    Quantitative assessment of liquid Ga penetration into an aluminium alloy by high-resolution X-ray tomography
    We have evaluated the liquid Ga penetration into an aluminium alloy by high-resolution X-ray tomography. The 3D visualization of a crack together with its surrounding grain structure was per-formed with the help of the Ga penetration technique. It is found that the advance directions of the crack-tip were strongly influenced by the grain microstructure and the branching of the crack is affected by grain distribution. In this study, the liquid Ga not only acts as a contrast agent for grain boundaries, but also expands the volume of the Al alloy due to Ga diffusion and associated processes. The 3D strain between the grains has been determined by microstructural gauging technique, which uses micropores as marker points. The 3D expansion of the sample volume, the volume reduction of micropores and the brittle fracture were evidently observed. (c) 2005 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.msea.2005.06.045

  • Quantitative assessment of liquid Ga penetration into an aluminium alloy by high-resolution X-ray tomography Reviewed

    T. Ohgaki, H. Toda, I. Sinclair, J.-Y. Buffiere, W. Ludwig, T. Kobayashi, M. Niinomi, T. Akahori

    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   427 ( 1-2 )   1 - 6   2006.7

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    DOI: 10.1016/j.msea.2005.07.050

  • Analysis of tensile deformation behaviors of Ti-XNb-10Ta-5Zr alloys for biomedical applications Reviewed

    N. Sakaguchi, M. Niinomi, T. Akahori, H. Toda

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   70 ( 7 )   572 - 578   2006.7

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    DOI: 10.2320/jinstmet.70.572

  • In-situ SEM/EBSP analysis during annealing in a pure aluminum foil for capacitor Reviewed International journal

    M. Kobayashi, Y. Takayama, H. Kato, H. Toda

    Materials Science Forum   539-543   362 - 367   2006.7

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  • 3-D high-density strain mapping procedure based on high-resolution CT Reviewed International journal

    M. Kobayashi, H. Toda, T. Ohgaki, K. Uesugi, D. S. Wilkinson, T. Kobayashi, Y. Kawai, Y. Aoki

    Materials Science Forum   539-543   2377 - 2382   2006.7

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  • Assessment of damage and fracture behaviors in a cast aluminum alloy via in-situ synchrotron microtomography Reviewed International journal

    S. Yamamoto, H. Toda, L. Qian, T. Ohgaki, M. Kobayashi, T. Kobayashi, K. Uesugi

    Materials Science Forum   519-521   1005 - 1010   2006.7

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  • Strength and fracture of aluminium alloys Reviewed International journal

    T. Kobayashi, H. Toda

    Materials Science Forum   539 ( 543 )   127 - 134   2006.7

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  • Application of local tomography technique to high-resolution synchrotron x-ray imaging Reviewed International journal

    T. Ohgaki, H. Toda, K. Uesugi, T. Kobayashi, K. Makii, T. Takagi, Y. Aruga

    Materials Science Forum   539-543   287 - 292   2006.7

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  • 生体用Ti-XNb-10Ta-5Zr合金の引張変形挙動解析 Reviewed International journal

    坂口信人, 新家光雄, 赤堀俊和, 戸田裕之

    日本金属学会誌   70 ( 7 )   572 - 578   2006.7

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  • 3-D image-based mechanical simulation of aluminium foams: Effects of internal microstructure Reviewed

    Hiroyuki Toda, Masayuki Takata, Tomomi Ohgaki, Masakazu Kobayashi, Toshiro Kobayashi, Kentaro Uesugi, Koichi Makii, Yasuhiro Aruga

    ADVANCED ENGINEERING MATERIALS (EUROMAT 2005)   8 ( 6 )   459 - 467   2006.6

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    3-D image-based mechanical simulation of aluminium foams: Effects of internal microstructure
    SR (Synchrotron radiation) X-ray microtomography has been utilized for the 3D characterization of microstructures in an aluminium foam. Volume tomographic data sets are converted into stereolithography tessellation language (STL) models to create 3-D finite-element simulation models. Both quasi-static and dynamic deformation and damage behaviours are investigated numerically, especially focussing on the effects of relatively small micro-pores inside cell wall materials. It has been fairly obvious that the existence of micro-pores and their spatial distribution pattern in cell materials would be a key issue to control the deformation and fracture behaviours. It has been also clarified that the stress wave propagation during the dynamic loading is prone to relatively uniform local stress elevation compared to the case of the static compression, thereby more extensive damage is predicted in the case of the dynamic loading due to the increase in volume sampled by an external loading. These results are in qualitative agreement with experimental observations. Overall, the approach taken in this study has provided highly effective ways to characterize microstructure/properties relationships in such highly heterogeneous materials.

    DOI: 10.1002/adem.200600035

  • 2D and 3D visualization of ductile fracture Reviewed

    Arnaud Weck, David S. Wilkinson, Hiroyuki Toda, Eric Maire

    ADVANCED ENGINEERING MATERIALS   8 ( 6 )   469 - 472   2006.6

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    DOI: 10.1002/adem.200600034

  • In-situ high-resolution x-ray CT observation of compressive and damage behaviour of aluminium foams by local tomography technique Reviewed

    Tomomi Ohgaki, Hiroyuki Toda, Masakazu Kobayashi, Kentaro Uesugi, Toshiro Kobayashi, Mitsuo Niinomi, Toshikazu Akahori, Koichi Makii, Yasuhiro Aruga

    ADVANCED ENGINEERING MATERIALS   8 ( 6 )   473 - 475   2006.6

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    DOI: 10.1002/adem.200600039

  • ウシ緻密骨における疲労き裂の発生および進展挙動 Reviewed International journal

    金鐘憲, 新家光雄, 赤堀俊和, 戸田裕之

    日本金属学会誌   70 ( 4 )   350 - 358   2006.4

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  • Quantitative assessment of microstructure and its effects on compression behavior of aluminum foams via high-resolution synchrotron X-ray tomography Reviewed International journal

    H. Toda, T. Ohgaki, K. Uesugi, M. Kobayashi, N. Kuroda, T. Kobayashi, M. Niinomi, T. Akahori, K. Makii, Y. Aruga

    Metallurgical and Materials Transactions. A   37A ( 4 )   1211 - 1220   2006.4

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  • 電気化学処理による新生体用β型チタン合金の生体活性表面処理 Reviewed International journal

    新家光雄, 赤堀俊和, 戸田裕之, 飯塚大亮, 福井壽男, 小川道治

    日本金属学会誌   70 ( 4 )   304 - 313   2006.4

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  • 生体活性化リン酸カルシウム結晶化ガラスコーティングした生体用Ti-29Nb-13Ta-4.6Zr合金の時効処理と力学的特性 Reviewed International journal

    赤堀俊和, 新家光雄, 小柳禎彦, 春日敏宏, 野田篤史, 戸田裕之, 福井壽男, 小川道治

    日本金属学会誌   70 ( 4 )   314 - 321   2006.4

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  • 生体用Ti-29Nb-13Ta-4.6Zr合金の力学的特性に及ぼす時効処理の影響 Reviewed International journal

    赤堀俊和, 新家光雄, 野田篤史, 戸田裕之, 福井壽男, 小川道治

    日本金属学会誌   70 ( 4 )   295 - 303   2006.4

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  • Aging treatment and mechanical properties of Ti-29Nb-13Ta-4.6Zr alloy for biomaterial applications coated with bioactive calcium phosphate invert glass Reviewed

    T. Akahori, M. Niinomi, Y. Koyanagi, T. Kasuga, H. Toda, H. Fukui, M. Ogawa

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   70 ( 4 )   314 - 321   2006.4

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    DOI: 10.2320/jinstmet.70.314

  • Quantitative assessment of microstructure and its effects on compression behavior of aluminum foams via high-resolution synchrotron X-ray tomography Reviewed

    H Toda, T Ohgaki, K Uesugi, M Kobayashi, N Kuroda, T Kobayashi, M Niinomi, T Akahori, K Makii, Y Aruga

    METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE   37A ( 4 )   1211 - 1219   2006.4

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    DOI: 10.1007/s11661-006-1072-0

  • Fatigue crack initiation and propagation behaviors of bovine compact bones Reviewed

    J. H. Kim, M. Niinomi, T. Akahori, H. Toda

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   70 ( 4 )   350 - 358   2006.4

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    DOI: 10.2320/jinstmet.70.350

  • Effect of aging treatment on mechanical properties of Ti-29Nb-13Ta-4.6Zr alloy for biomedical applications Reviewed

    T. Akahori, M. Niinomi, A. Noda, H. Toda, H. Hukui, M. Ogawa

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   70 ( 4 )   295 - 303   2006.4

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    DOI: 10.2320/jinstmet.70.295

  • Bioactive surface modification of newly developed β-type titanium alloy for biomedical applications by electrochemical treatment Reviewed

    M. Niinomi, T. Akahori, H. Toda, D. Iizuka, H. Fukui, M. Ogawa

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   70 ( 4 )   304 - 313   2006.4

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    DOI: 10.2320/jinstmet.70.304

  • 生体用Ti-30Nb-10Ta-5Zr合金の引張変形挙動解析 Reviewed

    坂口祐二, 新家光雄, 赤堀俊和, 戸田裕之

    日本金属学会誌   70 ( 1 )   89 - 95   2006.1

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  • Tensile deformation behavior of Ti-30Nb-10Ta-XZr alloys for biomedical applications Reviewed

    N. Sakaguchi, M. Niinomi, T. Akahori, H. Toda

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   70 ( 1 )   89 - 95   2006.1

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    DOI: 10.2320/jinstmet.70.89

  • FEM modeling of crack propagation in a model multiphase alloy Reviewed

    LH Qian, S Nishido, H Toda, T Kobayashi

    JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY   22 ( 1 )   59 - 65   2006.1

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  • Effect of loading rate on absorbed energy and fracture surface area in wrought aluminum alloys Reviewed

    T. Mukaiyama, M. Niinomi, H. Toda, T. Akahori, T. Kobayashi, I. Yamamoto

    Keikinzoku/Journal of Japan Institute of Light Metals   56 ( 1 )   15 - 20   2006.1

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    DOI: 10.2464/jilm.56.15

  • FEM modeling of crack propagation in a model multiphase alloy Reviewed International journal

    L. Qian, S. Nishido, H. Toda, T. Kobayashi

    Journal of Materials Science and Technology   22 ( 1 )   59 - 65   2006.1

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  • アルミニウム合金展伸材の吸収エネルギーと破壊表面積に及ぼす負荷速度の影響 Reviewed

    向山友彦, 新家光雄, 戸田裕之, 赤堀俊和, 小林俊郎, 山本勇

    軽金属   56 ( 1 )   15 - 20   2006.1

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  • 等軸および針状組織を有する高加工性チタン合金の接触面圧とフレッティング疲労特性 Reviewed

    武田淳二, 新家光雄, 赤堀俊和, 鈴木良樹, 戸田裕之

    軽金属   55 ( 12 )   661 - 667   2005.12

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  • Microstructure and fretting fatigue characteristics of highly workable titanium alloy with equiaxed α and Widmanstärten α structure Reviewed

    Junji Takeda, Mitsuo Niinomi, Toshikazu Akahori, Yoshiki Suzuki, H. Toda

    Keikinzoku/Journal of Japan Institute of Light Metals   55 ( 12 )   654 - 660   2005.12

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    Microstructure and fretting fatigue characteristics of highly workable titanium alloy with equiaxed α and Widmanstärten α structure

    DOI: 10.2464/jilm.55.654

  • Contact pressure and fretting fatigue characteristics of highly workable titanium alloy with equiaxed α and Widmanstätten α structure Reviewed

    Junji Takeda, Mitsuo Niinomi, Toshikazu Akahori, Yoshiki Suzuki, H. Toda

    Keikinzoku/Journal of Japan Institute of Light Metals   55 ( 12 )   661 - 667   2005.12

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    Contact pressure and fretting fatigue characteristics of highly workable titanium alloy with equiaxed α and Widmanstätten α structure

    DOI: 10.2464/jilm.55.661

  • Application of synchrotron x-ray microtomography to investigate ductile fracture in Al alloys Reviewed

    L Qian, H Toda, K Uesugi, T Kobayashi, T Ohgaki, M Kobayashi

    APPLIED PHYSICS LETTERS   87 ( 24 )   241907 - 241907   2005.12

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    DOI: 10.1063/1.214208

  • 等軸および針状組織を有する高加工性チタン合金のミクロ組織とフレッティング疲労特性 Reviewed

    武田淳二, 新家光雄, 赤堀俊和, 鈴木良樹, 戸田裕之

    軽金属   55 ( 12 )   654 - 660   2005.12

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  • 生体用Ti-29Nb-13Ta-4.6Zr合金の切欠き疲労特性 Reviewed

    赤堀俊和, 新家光雄, 大谷真史, 戸田裕之, 福井壽男, 小川道治

    軽金属   55 ( 11 )   575 - 581   2005.11

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  • Numerical simulation of fracture of model Al-Si alloys Reviewed

    LH Qian, H Toda, S Nishido, T Akahori, M Niinomi, T Kobayashi

    METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE   36A ( 11 )   2979 - 2992   2005.11

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    DOI: 10.1007/s11661-005-0071-x

  • Notch fatigue properties of a Ti-29Nb-13Ta-4.6Zr alloy for biomedical applications Reviewed

    T. Akahori, M. Niinomi, M. Otani, H. Toda, H. Fukui, M. Ogawa

    Keikinzoku/Journal of Japan Institute of Light Metals   55 ( 11 )   575 - 581   2005.11

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    DOI: 10.2464/jilm.55.575

  • Numerical simulation of fracture of model Al-Si alloys Reviewed International journal

    L. Qian, H. Toda, S. Nishido, T. Akahori, M. Niinomi, T. Kobayashi

    Metallurgical and Materials Transactions. A   36A ( 11 )   2979 - 2992   2005.11

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  • Fatigue properties of beta-type titanium alloy for biomedical applications under various fatigue conditions Reviewed International journal

    T. Akahori, M. Niinomi, H. Toda, H. Fukui, H. Ogawa

    Medical Device Materials III - Proceedings of the Materials and Processes for Medical Devices Conference 2005   154 - 162   2005.11

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  • Image-based mechanical analysis of multifilamentary microstructure formation in Al-Fe heavily deformed in-situ composites Reviewed International journal

    H. Toda, H. Mizutani, T. Akahori, M. Niinomi, T. Kobayashi

    Materials Transactions   46 ( 10 )   2229 - 2236   2005.10

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  • Image-based mechanical analysis of multifilamentary microstructure formation in Al-Fe heavily deformed in-situ composites Reviewed

    H Toda, H Mizutani, T Kobayashi, T Akahori, N Niinomi

    MATERIALS TRANSACTIONS   46 ( 10 )   2229 - 2236   2005.10

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    DOI: 10.2320/matertrans.46.2229

  • Effect of microstructure on fatigue strength of bovine compact bones Reviewed

    JH Kim, M Niinomi, T Akahori, J Takeda, H Toda

    JSME INTERNATIONAL JOURNAL SERIES A-SOLID MECHANICS AND MATERIAL ENGINEERING   48 ( 4 )   472 - 480   2005.10

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    DOI: 10.1299/jsmea.48.472

  • Effect of microstructure on fatigue strength of bovine compact bones Reviewed International journal

    J.H. Kim, M. Niinomi, T. Akahori, J. Takeda, H. Toda

    JSME International Journal Series A, Solid Mechanics and Material Engineering   48 ( 4 )   472 - 480   2005.10

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  • Improvement of mechanical properties by high temperature solution treatment in an aluminum casting alloy Reviewed International journal

    H. Toda, T. Kobayashi, M. Niinomi, T. Akahori, T. Sakai

    Proceedings of the 23rd ASM Heat Treating Society Conference and Exposition   364 - 369   2005.9

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  • Assessment of fatigue behaviour of aluminium foams by synchrotron X-ray microtomography Reviewed International journal

    T. Ohgaki, H. Toda, M. Kobayashi, K. Uesugi, T. Kobayashi, M. Niinomi, T. Akahori, K. Makii, Y. Aruga

    Porous Metals and Metal Foaming Technology, Proceedings of the 5th International Conference on Porous Metals and Metal Foaming Technology.   565 - 570   2005.9

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  • Image-based mechanical analysis of dynamic deformation and damage behaviors in an aluminium foam using synchrotron X-ray microtomography Reviewed International journal

    H. Toda, N. Kuroda, T. Ohgaki, M. Kobayashi, T. Akahori, M. Niinomi, T. Kobayashi, K. Uesugi, K. Makii, Y. Aruga

    Porous Metals and Metal Foaming Technology, Proceedings of the 5th International Conference on Porous Metals and Metal Foaming Technology.   409 - 414   2005.9

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  • β型チタン合金(TNTZ)線引き材の力学的特性と変形挙動 Reviewed

    赤堀俊和, 新家光雄, 戸田裕之, 山内鴻之祐, 福井寿男, 小川道治

    日本金属学会誌   69 ( 7 )   530 - 537   2005.7

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  • Mechanical properties and deformation behavior of β-type titanium alloy (TNTZ) drawn wires Reviewed

    T. Akahori, M. Niinomi, H. Toda, K. Yamauchi, H. Fukui, M. Ogawa

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   69 ( 7 )   530 - 537   2005.7

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    DOI: 10.2320/jinstmet.69.530

  • Mechanical properties of biocompatible beta-type titanium alloy coated with calcium phosphate invert glass-ceramic layer Reviewed

    T Akahori, M Niinomi, Y Koyanagi, T Kasuga, H Toda, H Fukui, M Ogawa

    MATERIALS TRANSACTIONS   46 ( 7 )   1564 - 1569   2005.7

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    DOI: 10.2320/matertrans.46.1564

  • Fatigue characteristics of low cost βtitanium alloys for healthcare and medical applications Reviewed

    B. Gunawarman, M. Niinomi, T. Akahori, T. Souma, M. Ikeda, H. Toda, K. Terashima

    Mater. Trans.   46 ( 7 )   1570 - 1577   2005.7

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    Fatigue characteristics of low cost beta titanium alloys for healthcare and medical applications
    Two new low cost beta titanium alloys, Ti-4.317e-7.1 Cr (TFC alloy) and Ti-43Fe-7. 1Cr-3.0Al (TFCA alloy) for healthcare and medical applications have been recently developed. As for such applications, the alloys are necessary to have high fatigue performance. The aim of this study is, therefore, to investigate fatigue characteristics of the alloys subjected to solution treatment above beta transus.
    Fatigue tests were carried out at a stress ratio, R, of 0.1 and a frequency of 10 Hz. Fatigue limit of the solution treated TFC alloy is higher than that of the solution treated TFCA alloy, but both are higher than that of the existing biometallic materials. Fatigue strength of the TFC alloy is almost independent of solution treatment temperature, while, fatigue strength of the TFCA alloy strongly depends on solution treatment temperature, especially, in the low cycle fatigue life (LCF) region. The fatigue ratio and biofunctionality of these new alloys are much higher than those of the existing biometallic materials. In general, a crack initiates from the surface in the LCF region and from subsurface (internal) in the high cycle fatigue life (HCF) region for the TFC alloy, while, in the case of the TFCA alloy, a crack tends to initiate from the subsurface in both LCF and HCF regions. The internal crack initiation sites are found to be the area with low beta phase stability in the LCF region and at the area with high stability of P phase in the HCF region. The relatively low fatigue strength of TFCA alloy is associated with the addition of Al that leads to precipitate et phase in which both crack initiation and facet formation are easier to occur.

    DOI: 10.2320/matertrans.46.1570

  • Effect of microstructure on tensile properties and static fracture toughness of dental gold alloy Reviewed

    M Niinomi, J Takeda, T Akahori, H Fukui, M Touyama, H Toda

    MATERIALS TRANSACTIONS   46 ( 7 )   1540 - 1544   2005.7

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    DOI: 10.2320/matertrans.46.1540

  • Fatigue characteristics of low cost beta titanium alloys for healthcare and medical applications Reviewed International journal

    B. Gunawarman, M. Niinomi, T. Akahori, T. Souma, M. Ikeda, H. Toda, K. Terashima

    Materials Transactions   46 ( 7 )   1570 - 1577   2005.7

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  • True-3D strain mapping for assessment of material deformation by synchrotron X-ray microtomography Reviewed International journal

    J. Ahn, H. Toda, M. Niinomi, T. Kobayashi

    Review of Progress in Quantitative NDE, American Institute of Physics, Melville, NY   24   1423 - 1430   2005.7

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  • Mechanical properties of biocompatible beta-type titanium alloy coated with calcium phosphate invert glass-ceramic layer Reviewed International journal

    T. Akahori, M. Niinomi, Y. Koyanagi, T. Kasuga, H. Toda, H. Fukui, M. Ogawa

    Materials Transactions   46 ( 7 )   1564 - 1569   2005.7

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  • Feasibility study on smart coating for failure prevention under thermo-mechanical fatigue loading Reviewed International journal

    H. Toda, M. Toyoda, T. Kobayashi, T. Akahori, M. Niinomi

    229 - 232   2005.7

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  • 3D internal strain mapping by tracking microstructural features in tomographic volumes of structural materials Reviewed International journal

    H. Toda, N. Kuroda, M. Takata, K. Uesugi, T. Ohgaki, M. Kobayashi, K. Makii, Y. Aruga, T. Akahori, M. Niinomi, T. Kobayashi

    IPAP Conference Series 7, Proceedings of the 8th International Conference on X-ray Microscopy, Institute of Pure and Applied Physics, Japan   240 - 242   2005.7

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  • 計装化シャルピー衝撃試験における荷重-変位曲線および吸収エネルギーに及ぼす衝撃刃先端曲率半径の影響 Reviewed

    森田繁樹, 小林俊郎, 新家光雄, 戸田裕之, 赤堀俊和

    鉄と鋼   91 ( 5 )   485 - 492   2005.5

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    DOI: 10.2355/tetsutohagane1955.91.5_485

  • Mechanical properties of Ti-4.5Al-3V-2Mo-2Fe and possibility for healthcare applications Reviewed

    B Gunawarman, M Niinomi, T Akahori, J Takeda, H Toda

    MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS   25 ( 3 )   296 - 303   2005.5

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    DOI: 10.1016/j.msec.2004.12.012

  • Mechanical properties and microstructures of low cost β titanium alloys for healthcare applications Reviewed

    B. Gunawarman, M. Niinomi, T. Akahori, T. Souma, M. Ikeda, H. Toda

    MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS   25 ( 3 )   304 - 311   2005.5

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    Mechanical properties and microstructures of low cost β titanium alloys for healthcare applications
    Titanium alloys are the best choice of metallic materials for biomedical and healthcare applications due to the combination of their excellent mechanical properties and biocompatibility. However, the usage of titanium alloys is limited due to its high cost. In order to reduce their cost, two new titanium alloys, Ti-4.3Fe-7.1Cr (TFC alloy) and Ti-4.3Fc-7.1Cr-3.0Al (TFCA alloy), for healthcare goods such as wheelchairs have been recently developed using low cost ferro-chrom elements. The microstructure and mechanical properties of both alloys subjected to solution treatment in the beta field or thermomechanical treatment were investigated, and then evaluated for their potential to be used as wheelchair materials.
    The specific strength and fatigue ratio of TFC and TFCA alloys are much greater than those of the existing wheelchair materials. Unrecrystallized grains obtained in the alloys at low solution treatment temperature can be eliminated by increasing solution treatment temperature or by conducting thermomechanical treatment. The latter method is recommended because it also gives a better strength and ductility balance as a result, mainly, of grain refinement. However, TFCA alloy seems to have more potential to be used as wheelchair materials compared to TFC alloy because of its better workability and post thermomechanical treatment ductility. (c) 2005 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.msec.2004.12.015

  • Mechanical properties and cyto-toxicity of new beta type titanium alloy with low melting points for dental applications Reviewed

    M Niinomi, T Akahori, T Takeuchi, S Katsura, H Fukui, H Toda

    MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS   25 ( 3 )   417 - 425   2005.5

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    DOI: 10.1016/j.msec.2005.01.024

  • Effect of Ta content on mechanical properties of Ti-30Nb-XTa-5Zr Reviewed

    N Sakaguchi, M Niinomi, T Akahori, J Takeda, H Toda

    MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS   25 ( 3 )   370 - 376   2005.5

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    DOI: 10.1016/j.msec.2005.04.003

  • Relationships between tensile deformation behavior and microstructure in Ti-Nb-Ta-Zr system alloys Reviewed

    N Sakaguchi, M Niinomi, T Akahori, J Takeda, H Toda

    MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS   25 ( 3 )   363 - 369   2005.5

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    DOI: 10.1016/j.msec.2004.12.014

  • Improvement in fatigue characteristics of newly developed beta type titanium alloy for biomedical applications by thermo-mechanical treatments Reviewed

    T Akahori, M Niinomi, H Fukui, M Ogawa, H Toda

    MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS   25 ( 3 )   248 - 254   2005.5

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    DOI: 10.1016/j.msec.2004.12.007

  • Corrosion resistance and biocompatibility of Ti-Ta alloys for biomedical applications Reviewed

    YL Zhou, M Niinomi, T Akahori, H Fukui, H Toda

    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   398 ( 1-2 )   28 - 36   2005.5

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    DOI: 10.1016/j.msea.2005.03.032

  • CT試験片及び円周切欠付丸棒試験片を用いたHT780鋼の破壊靱性評価 Reviewed International journal

    村上哲也, 戸田裕之, 赤堀俊和, 新家光雄, 小林俊郎

    鉄と鋼   91 ( 4 )   415 - 420   2005.4

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  • Improvement of mechanical properties by high temperature solution treatment in an AC4CH aluminum cast alloy Reviewed

    Y. Irinouchi, H. Toda, T. Sakai, T. Kobayashi, L. Wang

    Keikinzoku/Journal of Japan Institute of Light Metals   55 ( 4 )   159 - 163   2005.4

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    DOI: 10.2464/jilm.55.159

  • Assessment of fracture toughness by CT and round bar specimens in a HT780 steel Reviewed

    T. Murakami, H. Toda, T. Akahori, M. Niinomi, T. Kobayashi

    Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan   91 ( 4 )   415 - 420   2005.4

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    DOI: 10.2355/tetsutohagane1955.91.4_415

  • Effect of microstructure on tensile properties and static fracture toughness of dental gold alloy Reviewed International journal

    M. Niinomi, J. Takeda, T. Akahori, H. Fukui, M. Toyama, H. Toda

    Materials Transactions   46 ( 4 )   1540 - 1544   2005.4

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  • AC4CHアルミニウム合金鋳物の高温溶体化処理による機械的性質の改善 Reviewed

    入之内豊, 戸田裕之, 酒井祟之, 小林俊郎, 王磊

    軽金属   55 ( 4 )   159 - 163   2005.4

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  • 計装化シャルピー衝撃試験における計測荷重に及ぼすハンマー形状および衝撃刃形状と材質の影響 Reviewed

    森田繁樹, 小林俊郎, 新家光雄, 戸田裕之, 赤堀俊和

    材料の科学と工学   42 ( 3 )   158 - 163   2005.3

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  • Al-Siモデル合金のき裂伝播に及ぼすSi粒子の空間的分布の影響 Reviewed

    西戸誠志, Q. Lihe, 戸田裕之, 小林俊郎, 新家光雄, 赤堀俊和

    軽金属   55 ( 2 )   75 - 81   2005.2

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  • Influences of spatial distribution of Si particles on crack propagation in model Al-Si cast alloys Reviewed

    S. Nishido, L. Qian, H. Toda, T. Kobayashi, M. Niinomi, T. Akahori

    Keikinzoku/Journal of Japan Institute of Light Metals   55 ( 2 )   75 - 81   2005.2

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    DOI: 10.2464/jilm.55.75

  • Quantitative assessment of liquid Ga penetration into aluminium alloy by high-resolution X-ray tomography Reviewed International journal

    T. Ohgaki, H. Toda, I. Sinclair, J.-Y. Buffiere, W. Ludwig, T. Kobayashi

    Materials Science & Engineering. A   406 ( 1-2 )   261 - 267   2005.2

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  • 新しく設計した歯科用β型チタン合金の機械的性質と細胞毒性 Reviewed

    赤堀俊和, 新家光雄, 原田 雅章, 武田淳二, 戸田裕之, 桂成基, 竹内力, 福井壽男

    日本金属学会誌   69 ( 1 )   96 - 102   2005.1

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  • Mechanical properties and cyto-toxicity of newly designed β type Ti alloys for dental applications Reviewed

    T. Akahori, M. Niinomi, M. Harada, J. Takeda, H. Toda, S. Katsura, T. Takeuchi, H. Fukui

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   69 ( 1 )   96 - 102   2005.1

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    DOI: 10.2320/jinstmet.69.96

  • In-situ observations of fracture processes in 0.6 μm and 9.5 μm SiCP/6061Al composites Reviewed

    L. Qian, H. Toda, S. Morita, T. Kobayashi, Z.G. Wang

    Mater. Trans.   46 ( 1 )   34 - 41   2005.1

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    In-situ observations of fracture processes in 0.6 mu m and 9.5 mu m SiCP/6061Al composites
    ln-situ SEM observations of fracture processes in two 6061 Al alloy composites reinforced with coarse and line SiC particles, respectively. were carried out to clarify their fracture mechanisms. It was found that in the coarse particle reinforced composite, void were formed in the matrix around SiC particles ahead of the main crack tip. then coalesced with each other, and finally connected with the main crack tip. Causing propagation of the main crack. However. in the fine particle reinforced composite, multiple in micro-cracks were formed at the boundaries between SiC particle clusters and surrounding matrix or within the clusters. then connected with each other, and finally joined with the main crack tip. leading to crack branching and growth of the main crack, Crack branching, multiple cracking and crack deflection were proposed to contribute to the enhanced fracture toughness in the fine particle reinforced composite compared with the coarse particle reinforced composite.

    DOI: 10.2320/matertrans.46.34

  • In-situ observation of fracture of aluminium foam using synchrotron X-ray microtomography Reviewed

    H. Toda, T. Ohgaki, K. Uesugi, K. Makii, Y. Aruga, T. Akahori, M. Niinomi, T. Kobayashi

    Key Engineering Materials   297-300 II   1189 - 1195   2005.1

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    DOI: 10.4028/0-87849-978-4.1189

  • Effects of temperature and loading rate on fracture toughness Reviewed

    T. Murakami, H. Toda, T. Kobayashi

    Key Engineering Materials   297-300 IV   2397 - 2402   2005.1

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    DOI: 10.4028/0-87849-978-4.2397

  • Assessment of thermo-mechanical fatigue behaviors of cast Al-Si alloys by experiments and multi-step numerical simulation Reviewed

    H Toda, J Katano, T Kobayashi, T Akahori, M Niinomi

    MATERIALS TRANSACTIONS   46 ( 1 )   111 - 117   2005.1

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    DOI: 10.2320/matertrans.46.111

  • In-situ observations of fracture processes in 0.6 μm and 9.5 μm SiCP/6061Al composites Reviewed International journal

    46 ( 1 )   34 - 41   2005.1

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  • Effects of temperature and loading rate on fracture toughness Reviewed International journal

    T. Murakami, H. Toda, T. Kobayashi

    Key Engineering Materials   297-300   2397 - 2405   2005.1

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  • In-situ observation of fracture of aluminium foam using synchrotron X-ray microtomography Reviewed International journal

    H. Toda, T. Ohgaki, K. Uesugi, K. Makii, Y. Aruga, T. Akahori, M. Niinomi, T. Kobayashi

    Key Engineering Materials   297-300   1189 - 1195   2005.1

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  • 生体用β型チタン合金表面にコーティングしたリン酸カルシウム結晶化ガラス層の形態 Reviewed

    新家光雄, 赤堀俊和, 戸田裕之, 春日敏宏

    まてりあ   43 ( 1 )   1034   2005.1

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  • Ti-Nb-Ta-Zr系合金のミクロ組織,引張特性および弾性率に及ぼすTaおよびZr添加量の影響 Reviewed

    坂口祐二, 新家光雄, 赤堀俊和, 武田淳二, 戸田裕之

    日本金属学会誌   68 ( 12 )   1076 - 1082   2004.12

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  • Role of Si particle damage on fatigue characteristics of cast Al-Si alloys Reviewed

    S. Nishido, M. Kaneso, T. Kobayashi, H. Toda

    International Journal of Cast Metals Research   17 ( 6 )   345 - 350   2004.12

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    DOI: 10.1179/136404604225022702

  • Effects of Ta and Zr contents on microstructure, tensile properties and elastic modulus of Ti-Nb-Ta-Zr system alloys Reviewed

    N. Sakaguchi, M. Niinomi, T. Akahori, J. Takeda, H. Toda

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   68 ( 12 )   1076 - 1082   2004.12

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    DOI: 10.2320/jinstmet.68.1076

  • Notch effects on impact tensile properties in A6061-T6 aluminum alloy Reviewed International journal

    T. Masuda, H. Toda, T. Kobayashi

    Materials Science Forum   449   137 - 140   2004.11

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  • 3D strain mapping of small structures by synchrotron x-ray microtomography Reviewed International journal

    J.J. Ahn, H. Toda, M. Niinomi, T. Kobayashi, K. Uesugi, T. Akahori

    JOM   56 ( 11 )   308   2004.11

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  • Up-grade recycle by consolidating aluminium cutting chip under severe plastic deformation Reviewed International journal

    H. Toda, T. Kobayashi

    Materials Science Forum   449   333 - 336   2004.11

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  • Up-grade recycling of metallic cutting chips by employing heavily-deformed in-situ composite technique Reviewed

    H. Toda, J. Sawamura, T. Kobayashi

    Keikinzoku/Journal of Japan Institute of Light Metals   54 ( 10 )   418 - 424   2004.10

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    DOI: 10.2464/jilm.54.418

  • Up-grade recycling of metallic cutting chips by consolidation under severe plastic deformation Reviewed International journal

    H. Toda, T. Kobayashi, J. Sawamura

    Proceedings of the 9th International Conference on Aluminium Alloys, Ed. By J.F.Nie, A.J.Morton and B.C.Muddle, Brisbane (August 2004).   1328 - 1333   2004.8

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  • In situ high resolution synchrotron x-ray tomography of fatigue crack closure micromechanisms Reviewed

    KH Khor, JY Buffiere, W Ludwig, H Toda, HS Ubhi, PJ Gregson, Sinclair, I

    JOURNAL OF PHYSICS-CONDENSED MATTER   16 ( 33 )   S3511 - S3515   2004.8

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    DOI: 10.1088/0953-8984/16/33/012

  • Effect of notch on dynamic tensile properties in 6061 aluminum alloy Reviewed International journal

    M. Takata, T. Masuda, H. Toda, T. Kobayashi

    Proceedings of the 9th International Conference on Aluminium Alloys, Ed. By J.F.Nie, A.J.Morton and B.C.Muddle, Brisbane (August 2004).   476 - 481   2004.8

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  • Fracture analysis of a crack propagating in aluminium-7% silicon alloy casting Reviewed International journal

    S. Nishido, H. Toda, T. Kobayashi, J. Katano

    Proceedings of the 9th International Conference on Aluminium Alloys, Ed. By J.F.Nie, A.J.Morton and B.C.Muddle, Brisbane (August 2004).   672 - 677   2004.8

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  • Role of Si particle damage on fatigue characteristics of cast Al-Si alloys Reviewed International journal

    S. Nishido, M. Kaneko, T. Kobayashi, H. Toda

    International Journal of Cast Metals Research   17 ( 6 )   345 - 350   2004.6

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  • Stress triaxiality effect on dynamic tensile properties in a 6061-t6 aluminum alloy Reviewed

    T. Imasuda, M. Takata, H. Toda, T. Kobayashi, L. Wang

    Keikinzoku/Journal of Japan Institute of Light Metals   54 ( 5 )   175 - 181   2004.5

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  • A 3D measurement procedure for internal local crack driving forces via synchrotron X-ray microtomography Reviewed

    H Toda, Sinclair, I, JY Buffiere, E Maire, KH Khor, P Gregson, T Kobayashi

    ACTA MATERIALIA   52 ( 5 )   1305 - 1317   2004.3

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    DOI: 10.1016/j.actamat.2003.11.014

  • In-situ high resolution X-ray tomography of fracture micromechanisms in aluminium foams Reviewed International journal

    H. Toda, T. Ohgaki, K. Uesugi

    Research Frontiers   133 - 134   2004.1

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  • 切削粉の強加工によるアルミニウム合金の創製とその力学的性質 Reviewed

    藤井靖充, 戸田裕之, 小林俊郎

    軽金属   53 ( 9 )   368 - 372   2003.9

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  • Deformation and fracture of Cu-SiO2 bicrystals with [011] twist boundaries Reviewed

    Hiromi Miura, Taku Sakai, Hiroyuki Toda

    Acta Materialia   51 ( 16 )   4707 - 4717   2003.9

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    Deformation and fracture of Cu-SiO2 bicrystals with [011] twist boundaries
    Several kinds of Cu-SiO2 bicrystals having [011] twist boundaries with different misorientation angles were tensile tested at various temperatures from 473-1023 K at strain rates from 4.2 × 10 -5-4.2 × 10-3 s-1 in vacuum. Most of bicrystals fractured intergranularly. The grain-boundary strength and fracture behavior of the Cu-SiO2 bicrystals strongly depended on the grain-boundary character, temperature and strain rate. As the misorientation angle or grain-boundary energy increases, grain-boundary fracture takes place more easily at lower temperatures with lower fracture stresses. Furthermore, fracture stress and elongation to fracture decrease almost monotonically with increasing temperature and decreasing strain rate. The observed grain-boundary character and test condition dependence of grain-boundary strength can be understood reasonably by considering the occurrence of stress-concentration sites around the grain-boundary SiO2 particles to form voids and cracks caused by grain-boundary sliding. © 2003 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

    DOI: 10.1016/s1359-6454(03)00212-x

  • Effect of reinforcement volume fraction on the thermo-mechanical fatigue behavior of SiCw/6061A1 composites Reviewed

    LH Qian, ZG Wang, H Toda, T Kobayashi

    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   357 ( 1-2 )   240 - 247   2003.9

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    DOI: 10.1016/S0921-5093(03)00260-0

  • 5000系アルミニウム合金の動的変形挙動およびミクロ組織変化 Reviewed

    増田智一, 小林俊郎, 戸田裕之, 王磊

    材料   52 ( 8 )   981 - 987   2003.8

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  • Dynamic Deformation Behavior and Microstructure Evolution of 5000 Series Aluminum Alloys Reviewed

    T. Masuda, T. Kobayashi, H. Toda, L. Wang

    Zairyo/Journal of the Society of Materials Science, Japan   52 ( 8 )   981 - 987   2003.8

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    DOI: 10.2472/jsms.52.981

  • Assessment of the fatigue crack closure phenomenon in damage-tolerant aluminium alloy by in-situ high-resolution synchrotron X-ray microtomography Reviewed

    H. Toda, I. Sinclair, J. Y. Buffi?re, E. Maire, T. Connolley, M. Joyce, K. H. Khor, P. Gregson

    Philosophical Magazine   83 ( 21 )   2429 - 2448   2003.7

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    DOI: 10.1080/1478643031000115754

  • Effects of strain rate on deformation behavior of A6061-T6 aluminum alloys Reviewed International journal

    T. Masuda, T. Kobayashi, L. Wang, H. Toda

    Materials Science Forum   426-432   285 - 290   2003.1

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  • Grain size refinement through gas bubble stirring in AC4CH cast aluminium alloy Reviewed

    N. Hayat, T. Kobayashi, H. Toda, H. Kojima

    International Journal of Cast Metals Research   15 ( 5 )   505 - 512   2003.1

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    DOI: 10.1080/13640461.2003.11819536

  • Creation of aluminum alloy by severe plastic deformation of cutting chip and its mechanical properties Reviewed

    Y. Fujii, H. Toda, T. Kobayashi

    Keikinzoku/Journal of Japan Institute of Light Metals   53 ( 9 )   368 - 372   2003.1

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    DOI: 10.2464/jilm.53.368

  • Assessments of damage and fracture behaviours of Al-Mg-Si alloys Reviewed

    H. Toda, T. Kobayashi

    Keikinzoku/Journal of Japan Institute of Light Metals   53 ( 11 )   469 - 475   2003.1

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    DOI: 10.2464/jilm.53.469

  • Grain size refinement through gas bubble stirring in AC4CH cast aluminium alloy Reviewed International journal

    N. Hayat, T. Kobayashi, H. Toda, H. Kojima

    International Journal of Cast Metals Research   15 ( 5 )   505 - 512   2003.1

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  • Synchrotron microtomography of fatigue crack closure Reviewed International journal

    K.H. Khor, M. Joyce, T. Connolley, H. Toda, I. Sinclair, E. Maire, J.-Y. Buffiere

    2002 ESRF Scientific Highlights   79 - 80   2003.1

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  • Damage behaviours of various coarse Al-Fe-Si particles in model wrought alloys Reviewed International journal

    H. Toda, T. Kobayashi

    Materials Science Forum   426-432   393 - 398   2003.1

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  • Analysis of test data obtained from Charpy V and impact tensile test Reviewed

    T. Kobayashi, H. Toda, T. Masuda

    European Structural Integrity Society   30 ( C )   173 - 180   2002.12

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    DOI: 10.1016/S1566-1369(02)80018-8

  • AC4CHアルミニウム合金鋳物における熱機械疲労特性および機械的性質に及ぼすミクロ組織の影響 Reviewed

    金曽誠, 西戸誠志, 小林俊郎, 戸田裕之

    鋳造工学   74 ( 11 )   699 - 705   2002.11

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  • Fracture toughness of a 6061Al matrix composite reinforced with fine SiC particles Reviewed

    LH Qian, T Kobayashi, H Toda, T Goda, ZG Wang

    MATERIALS TRANSACTIONS   43 ( 11 )   2838 - 2842   2002.11

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    Fracture toughness of a 6061Al matrix composite reinforced with fine SiC particles
    The fracture toughness of 6061 Al alloy metal matrix composite reinforced with 15 vol&#37; fine SiC particles of 600 nm, in size under a high temperature over-aged condition was studied. And the toughness of the 6061 Al matrix alloy and the same matrix alloy reinforced with coarse SiC particles of 9.5 mum were also measured for comparison. Fracture toughness tests were conducted on a servo-hydraulic testing machine by using three point bending specimens. The results showed that the toughness of the fine particle reinforced composite was obviously higher than that of the coarse particle reinforced composite in terms of crack initiation toughness, crack propagation energy and total absorbed energy. The mechanisms controlling the fracture toughness of the two composites reinforced with fine and coarse SiC particles were discussed based upon the measured toughness data and microstructure examinations by means of an optical microscope and a scanning electron microscope.

    DOI: 10.2320/matertrans.43.2838

  • Fracture toughness of a 6061Al matrix composite reinforced with fine SiC particles Reviewed International journal

    L. Qian, T. Kobayashi, H. Toda, T. Goda, Z.G. Wang

    Materials Transactions   43 ( 11 )   2838 - 2842   2002.11

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  • In-situ strengths of various coarse intermetallic particles in wrought Aluminum alloys International journal

    H. Toda, T. Kobayashi

    ICAA-8, Cambridge, UK   1097 - 1102   2002.7

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  • Impact toughness of weldments in Al-Mg-Si alloys Reviewed International journal

    V.A. Mosneaga, T. Mizutani, T. Kobayashi, H. Toda

    Materials Transactions   43 ( 6 )   1381 - 1389   2002.6

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  • Impact toughness of weldments in Al-Mg-Si alloys Reviewed

    VA Mosneaga, T Mizutani, T Kobayashi, H Toda

    MATERIALS TRANSACTIONS   43 ( 6 )   1381 - 1389   2002.6

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    DOI: 10.2320/matertrans.43.1381

  • Dynamic tensile deformation of SiCP/6061Al composite. Part 2 Strain rate sensitivity Reviewed

    L. Qian, Z. Wang, T. Kobayashi, H. Toda

    Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research   16 ( 3 )   289 - 295   2002.6

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  • Dynamic tensile deformation of SiCp/6061Al composite. Part 1 Strain hardening characteristic Reviewed

    L. Qian, Z. Wang, T. Kobayashi, H. Toda

    Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research   16 ( 3 )   285 - 288   2002.6

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  • Dynamic tensile deformation of SiCp/6061 Al composite part 1 strain hardening characteristic Reviewed

    Q. Lihe, Z.G. Wang, T. Kobayashi, H. Toda

    Chinese Journal of Materials Research   16 ( 3 )   285 - 288   2002.3

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  • Dynamic tensile deformation of SiCp/6061 Al composite Part 2 Strain rate sensitivity Reviewed

    Q. Lihe, Z.G. Wang, T. Kobayashi, H. Toda

    Chinese Journal of Materials Research   16 ( 3 )   289 - 295   2002.3

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  • 半凝固プロセスにより作製したアルミニウム合金鋳物の疲労特性 Reviewed

    戸田裕之, 小林俊郎, 野口隆憲, 杉山大吾, 三浦博巳

    鋳物   74 ( 2 )   75 - 82   2002.2

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  • Analysis of test data obtained from charpy V and impact tensile test Reviewed International journal

    T. Kobayashi, H. Toda, T. Masuda

    From Charpy to Present Impact Testing, Elsevier   30   173 - 180   2002.1

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  • Experimental investigations of fatigue characteristics of AC4CH cast aluminum alloys fabricated through rheocast and squeeze cast methods Reviewed International journal

    N. Hayat, H. Toda, T. Kobayashi, N. Wade

    Proceedings of ICAA-8, Materials Science Forum   396-402   1353 - 1358   2002.1

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  • Fatigue characteristics of AC4CH aluminium cast alloys fabricated by inclined cooling plate technique Reviewed International journal

    N. Hayat, H. Toda, T. Kobayashi, N. Wade, H.K. Ahn, C.H. Yu, H. Miura

    International Journal of Cast Metals Research   14 ( 5 )   293 - 301   2002.1

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  • 複合材料における組み合わせ応力下の界面剥離基準 Reviewed

    戸田裕之, 植田 毅, 小林俊郎, 合田孝志

    材料   50 ( 12 )   1375 - 1381   2001.12

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  • Thermo-mechanical fatigue of SIC whisker reinforced 6061a1 composites Reviewed

    L. Qian, Z.G. Wang, H. Toda and T. Kobayashi

    Jinshu Xuebao/Acta Metallurgica Sinica   37 ( 11 )   1201 - 1202   2001.12

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  • Strain rate dependency of impact tensile properties in various commercial aluminum alloys Reviewed

    T. Masuda, T. Kobayashi, H. Toda, S. Morita

    International Journal of Materials and Product Technology   ( SPEC ISS. VOL.2 )   823 - 828   2001.12

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  • Isothermal fatigue and in-phase thermo-mechanical fatigue of a 6061Al/SiCw Reviewed

    L. Qian, Z. G. Wang, H. Toda, T. Kobayashi

    International Journal of Materials and Product Technology   ( SPEC ISS. VOL.2 )   799 - 804   2001.12

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  • Interfacial debonding criteria under combined stress in composites Reviewed

    H. Toda, T. Ueda, T. Kobayashi, T. Gouda

    Zairyo/Journal of the Society of Materials Science, Japan   50 ( 12 )   1375 - 1381   2001.12

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    DOI: 10.2472/jsms.50.1375

  • Influence of ECAP and age hardening treatment in 6061 Al alloy Reviewed

    V. A. Mosneaga, T. Kobayashi, H. Toda

    International Journal of Materials and Product Technology   16 ( 8 )   710 - 716   2001.12

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    DOI: 10.1504/IJMPT.2001.001290

  • Expansion behavior of thermally cycled aluminum alloy composites reinforced with aluminum borate whiskers Reviewed

    M. Shibata, Y. Takemoto, T. Kobayashi, H. Toda

    International Journal of Materials and Product Technology   ( SPEC. ISS. VOL.1 )   275 - 280   2001.12

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  • Epoxy-clay nanocomposites using polybenzoxazine as a curing agent Reviewed

    T. Agag, T. Takeichi, H. Toda, T. Kobayashi

    International Journal of Materials and Product Technology   ( SPEC ISS. VOL.2 )   706 - 711   2001.12

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  • Al-X (X= Nb, Cr, Fe) ultra-high strength in-situ composite wire Reviewed

    H. Toda, T. Kobayashi

    International Journal of Materials and Product Technology   ( SPEC. ISS. VOL.1 )   427 - 432   2001.12

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  • High strain rate deformation behavior of Al-Mg alloys Reviewed International journal

    T. Masuda, T. Kobayashi, H. Toda

    Proceedings of Advances in Fracture Research, Elsevier   2001.12

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  • Fracture behavior of a SiCw/6061Al alloy composite under cyclic loading Reviewed International journal

    H. Toda, L. Wang, T. Kobayashi, Z.M. Sun

    Proceedings of Advances in Fracture Research, Elsevier   2001.12

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  • Experimental and analytical investigations of fracture toughness in weldments of 6082 Al alloy Reviewed International journal

    V.A. Mosneaga, T. Mizutani, T. Kobayashi, H. Toda

    Materials Transactions   42 ( 11 )   2386 - 2391   2001.11

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  • Thermo-mechanical fatigue of SiC whisker reinforced 6061Al composites II. Fatigue life and damage mechanism Reviewed

    L. Qian, Z. Wang, H. Toda, T. Kobayashi

    Jinshu Xuebao/Acta Metallurgica Sinica   37 ( 11 )   1203 - 1207   2001.11

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  • Thermo-mechanical fatigue of SiC whisker reinforced 6061Al composites - I. Stress and strain during cycling Reviewed

    LH Qian, ZG Wang, H Toda, T Kobayashi

    ACTA METALLURGICA SINICA   37 ( 11 )   1198 - 1202   2001.11

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  • Experimental and analytical investigations of fracture toughness in weldments of 6082 Al alloy Reviewed

    VA Mosneaga, T Mizutani, T Kobayashi, H Toda

    MATERIALS TRANSACTIONS   42 ( 11 )   2386 - 2391   2001.11

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    DOI: 10.2320/matertrans.42.2386

  • Dynamic fracture toughness of 6061Al composites reinforced with SiC particulates Reviewed

    LH Qian, T Kobayashi, H Toda, ZG Wang

    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   318 ( 1-2 )   189 - 196   2001.11

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    DOI: 10.1016/S0921-5093(01)01267-9

  • Thermo-mechanical fatigue of SiC whisker reinforced 6061Al composites - II. Fatigue life and damage mechanism Reviewed

    LH Qian, ZG Wang, H Toda, T Kobayashi

    ACTA METALLURGICA SINICA   37 ( 11 )   1203 - 1207   2001.11

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    Thermo-mechanical fatigue of SiC whisker reinforced 6061Al composites - II. Fatigue life and damage mechanism
    The In-phase (IP) and out-of-phase (OP) thermo-mechanical fatigue (TMF) life and damage mechanism were studied on 15&#37;SiCW (volume fraction) and 28&#37;SiCW/6061Al. The result indicates that in small strain range, the IP TMF life is longer than that of the OP-TMF; in large strain range it is close to (for 28&#37;SiCW) or even shorter than the OP-TMF life (for 15&#37;SiCW). A comparison of the fatigue lives between the two composites illustrates that in the case of the OP-TMF, 15&#37;SiCW/6061Al shows longer life than 28&#37; SiCW/6061Al, however, in the case of IP-TMF, there is a crossover between the fatigue life curves of the two composites, meaning that the life being longer or shorter depends on strain level. Their damage processes are all related to initiation, growth and coalescence of voids in the matrix around whiskers.

  • Dynamic fracture toughness of 6061Al composites reinforced with SiC particulates Reviewed International journal

    L. Qian, T. Kobayashi, H. Toda, Z.G. Wang

    Materials Science & Engineering. A   318 ( 1-2 )   189 - 196   2001.11

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  • Thermo-mechanical fatigue of SiC whisker reinforced 6061Al composites - II. Fatigue life and damage mechanism Reviewed

    L. Qian, Z.G. Wang, H. Toda, T. Kobayashi

    Acta Metallurgica Sinica   37 ( 11 )   1203 - 1207   2001.11

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  • Thermo-mechanical fatigue of SiC whisker reinforced 6061Al composites - I. Stress and strain during cycling Reviewed

    L. Qian, Z.G. Wang, H. Toda, T. Kobayashi

    Acta Metallurgica Sinica   37 ( 11 )   1198 - 1202   2001.11

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  • Fatigue properties of Al-Si alloys fabricated through semi-solid process International journal

    H. Toda, T. Kobayashi, T. Noguchi, N. Wade, H.K. Ahn, C.H. Yu

    EUROMAT 2001, FEMS, Rimini, Italy   CD-ROM.   2001.9

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  • Strain rate dependency of strength in TiB particle reinforced Ti matrix composite Reviewed

    K. Osako, H. Toda, T. Kobayashi

    Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan   87 ( 9 )   619 - 622   2001.9

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    DOI: 10.2355/tetsutohagane1955.87.9_619

  • TiB粒子強化Ti基複合材料の強度の歪み速度依存性 Reviewed

    大迫和久, 戸田裕之, 小林俊郎

    鉄と鋼   87 ( 9 )   619 - 622   2001.9

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  • Effects of coarse intermetallic particles on fracture toughness of wrought aluminum alloys International journal

    H. Toda, T. Kobayashi, A. Takahashi

    THERMEC'2000, Las Vegas, USA(October 2001)   117/3 ( CDROM, Section A2 )   2001.8

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  • Shape memory alloy particles dispersed titanium composite Reviewed International journal

    T. Kobayashi, H. Toda

    Proceedings of the International Symposium on Smart Materials and Structural Systems, JSME   85 - 91   2001.8

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  • アルミニウム合金中の粗大な金属間化合物粒子の損傷が力学的性質に与える影響の実験的評価 Reviewed

    戸田裕之, 高橋明宏, 小林俊郎

    軽金属   51 ( 7 )   361 - 367   2001.7

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  • Experimental evaluation of effects of damage evolution at coarse secondary phase particles on mechanical properties of aluminum alloys Reviewed

    H. Toda, A. Takahashi, T. Kobayashi

    Keikinzoku/Journal of Japan Institute of Light Metals   51 ( 7 )   361 - 367   2001.7

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    DOI: 10.2464/jilm.51.361

  • High strain rate deformation behavior of Al-Mg alloys International journal

    T. Masuda, T. Kobayashi, H. Toda

    Impact engineering and application : proceedings of the 4th International Symposium on Impact Engineering   1   363 - 368   2001.7

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  • 6061アルミニウム合金の力学的性質に及ぼす溶体化処理後の冷却速度の影響 Reviewed

    森田繁樹, 戸田裕之, 高橋明宏, 星山中, 小林俊郎, 永島洋

    軽金属   51 ( 6 )   307 - 312   2001.6

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  • Fabrication and evaluation of shape memory alloy particles dispersed Titanium composites International journal

    H. Toda, T. Hashizume, T. Kobayashi

    ICCM-13, Beijing   ID-1303   1 - 10   2001.6

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  • 中空粒子強化複合材料の各種力学的性質の評価およびその向上のための検討 Reviewed

    戸田裕之, 加賀城央, 細井一良, 伊藤洋輔, 東原隆, 小林俊郎, 合田孝志

    材料   50 ( 5 )   474 - 481   2001.5

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  • Reactivity of coke with CO2 and evaluation of strength after reaction Reviewed

    M. Kawakami, K. Murayama, M. Shibata, T. Takenaka, H. Toda

    Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan   87 ( 5 )   252 - 258   2001.5

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    DOI: 10.2355/tetsutohagane1955.87.5_252

  • Evaluation of mechanical properties of hollow particle reinforced composites and analyses aimed at their improvement Reviewed

    H. Toda, H. Kagajo, K. Hosoi, T. Kobayashi, Y. Ito, T. Higashihara, T. Gohda

    Zairyo/Journal of the Society of Materials Science, Japan   50 ( 5 )   474 - 481   2001.5

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    DOI: 10.2472/jsms.50.474

  • コークスのCO2との反応性と反応後強度の評価 Reviewed

    川上正博, 村山賢吾, 柴田将寛, 竹中俊英, 戸田裕之

    鉄と鋼   87 ( 5 )   252 - 258   2001.5

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  • Al2O3-TiC複合材料の破壊靱性とその向上法 Reviewed

    神谷文彦, 戸田裕之, 小林俊郎, 高巣正信, 岡本 直之

    日本金属学会誌   65 ( 4 )   323 - 330   2001.4

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  • 溶湯攪拌法で作製したSiC/7075アルミニウム合金複合材料の高速超塑性 Reviewed

    彦坂武夫, 今井恒道, 小林俊郎, 戸田裕之

    軽金属   51 ( 3 )   169 - 174   2001.3

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  • High strain rate superplasticity of the SiCp/7075 aluminum alloy composite made by a vortex method Reviewed

    T. Hikosaka, T. Imai, T. Kobayashi, H. Toda

    Keikinzoku/Journal of Japan Institute of Light Metals   51 ( 3 )   169 - 174   2001.3

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    DOI: 10.2464/jilm.51.169

  • Fracture toughness of various zones in weldments of 6082 aluminum alloy Reviewed

    H. Toda, T. Mizutani, A. Takahashi, T. Kobayashi, V. A. Mosneaga

    Keikinzoku/Journal of Japan Institute of Light Metals   51 ( 3 )   163 - 168   2001.3

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    DOI: 10.2464/jilm.51.163

  • 6061合金における粗大な金属間化合物粒子の損傷挙動のSEM内その場観察 Reviewed

    戸田裕之, 小林俊郎, 星山中, 高橋明宏

    軽金属   51 ( 2 )   113 - 118   2001.2

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  • Effect of the particle size and volume fraction on superplasticity of SiCp/6061 aluminum alloy composite Reviewed

    T. Hikosaka, T. Imai, T. Kobayashi, H. Toda

    Keikinzoku/Journal of Japan Institute of Light Metals   51 ( 2 )   86 - 92   2001.2

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    DOI: 10.2464/jilm.51.86

  • SiCp/6061アルミニウム合金複合材料の超塑性に及ぼす粒子径と体積率の影響 Reviewed

    彦坂武夫, 今井恒道, 小林俊郎, 戸田裕之

    軽金属   51 ( 2 )   86 - 92   2001.2

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  • 展伸用アルミニウム合金中の粗大な金属間化合物粒子の損傷によって誘発される破壊の計算機シミュレーション Reviewed

    戸田裕之, 小林俊郎, 高橋明宏, 星山中

    日本金属学会誌   65 ( 1 )   29 - 37   2001.1

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  • Numerical simulation of fracture induced by damage of intermetallic particles in wrought aluminum alloy Reviewed

    H. Toda, T. Kobayashi, A. Takahashi, A. Hoshiyama

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   65 ( 1 )   29 - 37   2001.1

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    DOI: 10.2320/jinstmet1952.65.1_29

  • In-situ SEM study on damage evolution at coarse secondary particles in 6061 aluminum alloy Reviewed

    H. Toda, T. Kobayashi, A. Hoshiyama, A. Takahashi

    Keikinzoku/Journal of Japan Institute of Light Metals   51 ( 2 )   113 - 118   2001.1

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    DOI: 10.2464/jilm.51.113

  • Effects of quenching rate on mechanical properties of 6061 aluminum alloy Reviewed

    S. Morita, H. Toda, A. Takahashi, A. Hoshiyama, T. Kobayashi, H. Nagashima

    Keikinzoku/Journal of Japan Institute of Light Metals   51 ( 6 )   307 - 312   2001.1

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    DOI: 10.2464/jilm.51.307

  • Analysis of fracture toughness and TiC/Al2O3 composites Reviewed

    F. Kamiya, H. Toda, T. Kobayashi, M. Takasu, N. Okamoto

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   65 ( 4 )   323 - 330   2001.1

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    DOI: 10.2320/jinstmet1952.65.4_323

  • Design and evaluation of TiNi particle dispersed titanium matrix composite Reviewed International journal

    T. Kobayashi, H. Toda, T. Hashizume

    Transactions of Materials Research Society of Japan   26 ( 1 )   247 - 250   2001.1

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  • Influence of ECAP and age hardening treatment in 6061 Al alloy Reviewed International journal

    V.A. Mosneaga, T. Kobayashi, H. Toda

    International Journal of Materials and Product Technology   16 ( 8 )   710 - 716   2001.1

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  • Dynamic fracture toughness of a Ti-45Al-1.6Mn alloy at temperature Reviewed International journal

    H. Fukumasu, T. Kobayashi, H. Toda, K. Shibue

    Metallurgical and Materials Transactions. A   31 ( 12 )   3053 - 3061   2000.12

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  • Dynamic fracture toughness of a Ti-45Al-1.6Mn alloy at high temperature Reviewed

    H Fukumasu, T Kobayashi, H Toda, K Shibue

    METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE   31 ( 12 )   3053 - 3061   2000.12

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    Dynamic fracture toughness of a Ti-45Al-1.6Mn alloy at high temperature
    Dynamic fracture toughness of a reactive sintered gamma -base TiAl alloy is studied in the temperature range from 298 to 1073 K, The stop block method is employed in order to observe the crack paths and microcrack distribution ahead of a main crack tip under dynamic loading conditions at high temperature. Fracture surface, crack path, and microcrack observations are carried out using a scanning electron microscope (SEM). Microcrack initiation criteria and crack-tip stress shielding effect caused by crack deflection are discussed. The experimental results demonstrate that the dynamic fracture toughness, J(Id). increases with increasing temperature, and after attaining the maximum value at 873 K, the toughness decreases. Crack path morphology varies with temperature. The stress shielding effect at the crack tip caused by main crack deflection was found to affect the difference in crack extension energy for each temperature. The number of microcracks ahead of a main crack varies with temperature. The stress shielding effect at the crack tip caused by microcracking was found to contribute to toughening around 873 K.

  • Al-X (X=Nb, Cr, Fe) ultra-high strength in-situ composite wire Reviewed International journal

    H. Toda, T. Kobayashi

    Proceedings of ISAEM-2000, International Journal of Materials Product Technology, Special Issue, SPM1   427 - 432   2000.10

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  • High temperature low cycle fatigue and thermo-mechanical fatigue of a 6061 A1 reinforced with SiCW Reviewed

    L. Qian, Z. G. Wang, H. Toda, T. Kobayashi

    Materials Science and Engineering A   291 ( 1-2 )   235 - 245   2000.10

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    DOI: 10.1016/S0921-5093(00)00892-3

  • High temperature low cycle fatigue and thermo-mechanical fatigue of a 6061Al reinforced with SiCW Reviewed

    LH Qian, ZG Wang, H Toda, T Kobayashi

    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   291 ( 1-2 )   235 - 245   2000.10

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    High temperature low cycle fatigue and thermo-mechanical fatigue of a 6061Al reinforced with SiCW
    The high temperature isothermal low cycle fatigue (IF) and thermo-mechanical fatigue (TMF) of a 6061Al alloy reinforced with 28 vol.&#37; silicon carbide whiskers were studied. IF experiments were conducted at a temperature of 300 degrees C, and two types of TMF tests, i.e. in-phase (IP) and out-of-phase (OP), were performed with temperature cycling between 150 and 300 degrees C. All experiments were carried out under mechanical strain range control. Experimental results of mechanical behavior and mean stresses for TMF and IF loadings are provided. It can be seen that both IP and OP-TMF show continuous cyclic softening until failure, while IF loading initially shows several cycles of cyclic hardening followed by cyclic softening until final fracture. A comparison of TMF and IF lives has been made and various damage mechanisms operative under different strain ranges and loading conditions have been explained. SEM micrographs show that damage processes under both IF and TMF conditions consist of initiation, growth and coalescence of voids in the matrix around whiskers. Due to the complexity of the relationship between IF and TMF damage: IF data cannot be used to evaluate TMF life. (C) 2000 Elsevier Science S.A. All rights reserved.

    DOI: 10.1016/S0921-5093(00)00892-3

  • Isothermal fatigue and in-phase thermo-mechanical fatigue of a 6061Al/SiCw Reviewed International journal

    L. Qian, Z.G. Wang, H. Toda, T. Kobayashi

    Proceedings of ISAEM-2000, International Journal of Materials Product Technology, Special Issue, SPM1,   799 - 804   2000.10

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  • Expansion behavior of thermally cycled aluminium alloys reinforced with aluminium borate whiskers Reviewed International journal

    M. Shibata, Y. Takemoto, T. Kobayashi, H. Toda

    Proceedings of ISAEM-2000, International Journal of Materials Product Technology, Special Issue, SPM1,   275 - 280   2000.10

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  • Epoxy-clay nanocomposites using polybenzoxazine as a curing agent Reviewed International journal

    T. Agag, T. Takeichi, H. Toda, T. Kobayashi

    Proceedings of ISAEM-2000, International Journal of Materials Product Technology, Special Issue, SPM1,   706 - 711   2000.10

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  • Strain rate dependency of impact tensile properties in various commercial aluminum alloys Reviewed International journal

    T. Masuda, T. Kobayashi, H. Toda, S. Morita

    Proceedings of ISAEM-2000, International Journal of Materials Product Technology, Special Issue, SPM1,   823 - 828   2000.10

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  • 計装化シャルピー衝撃試験における計測荷重に及ぼす衝撃刃形状と歪ゲージ貼付位置の影響 Reviewed

    小林俊郎, 大谷昌弘, 森田繁樹, 戸田裕之

    鉄と鋼   86 ( 9 )   25 - 31   2000.9

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  • 5083アルミニウム合金O材の極低温から高温における動的破壊靱性 Reviewed

    高橋明宏, 小林俊郎, 戸田裕之, 水谷道

    軽金属   50 ( 8 )   386 - 391   2000.8

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  • Effect of testing temperature from cryogenic to high temperatures on dynamic fracture properties in 5083 aluminum alloy Reviewed

    A. Takahashi, T. Kobayashi, H. Toda, T. Mizutani

    Keikinzoku/Journal of Japan Institute of Light Metals   50 ( 8 )   386 - 391   2000.8

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    DOI: 10.2464/jilm.50.386

  • Thermo-mechanical fatigue of a SiCw/6061A1 composite Reviewed International journal

    L. Qian, Z.G. Wang, H. Toda, T. Kobayashi, Q. Yao

    Materials Transactions, JIM   41 ( 6 )   651 - 655   2000.6

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  • Thermo-mechanical fatigue of a SiCW/6061Al composite Reviewed

    L. Qian, Z.G. Wang, H. Toda, T. Kobayashi, Q. Yao

    Materials Transactions, JIM   41 ( 6 )   651 - 655   2000.6

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    DOI: 10.2320/matertrans1989.41.651

  • Al-X (X=Nb, Cr, Fe) Ultra-High Strength In-Situ Composite Wire Reviewed

    Toshiro Kobayashi, Hiroyuki Toda

    Materials Science Forum, Proc of 7th International Conference on Aluminum Alloys (ICAA-7)   331-337   1133 - 1138   2000.5

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    Al-X (X=Nb, Cr, Fe) Ultra-High Strength In-Situ Composite Wire

    DOI: 10.4028/www.scientific.net/msf.331-337.1133

  • Al-X(X=Nb, Cr, Fe) ultra-high strength in-situ composite wire Reviewed International journal

    H. Toda, T. Kobayashi

    ICAA-7, Charlottesville, Virginia   331-337   1133 - 1138   2000.4

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  • Effects of damaged coarse inclusion particles on mechanical properties of wrought aluminum alloys Reviewed International journal

    H. Toda, A. Takahashi, T. Kobayashi

    ICAA-7, Charlottesville, Virginia   331-337   1261 - 1266   2000.4

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  • Mechanical analysis of toughness degradation due to premature fracture of course inclusions in wrought aluminium alloys Reviewed

    H Toda, T Kobayashi, A Takahashi

    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   280 ( 1 )   69 - 75   2000.3

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    Mechanical analysis of toughness degradation due to premature fracture of course inclusions in wrought aluminium alloys
    The present work is aimed at numerical analyses of toughness degradation due to damage evolution at coarse inclusions, with particular interests on microstructural control for toughness enhancement by controlling the damage initiation. The investigation employs a combination of crack-tip singularity and Eshelby internal stress analysis within each inclusion. The essential feature of the model is to predict crack initiation toughness and crack path morphology using a mixed-mode fracture criterion. The procedure accounts a criterion for the damage evolution, effects of a deflected crack-tip, and shielding/antishielding effects due to the damaged inclusions. The toughness is found to be degraded by increasing the grain size of the matrix and the volume fraction of the inclusion, and also by decreasing the fracture strength of the inclusion and hence its coarsening. The effects are remarkably pronounced when the inclusions are agglomerated. Especially, weak inclusions agglomerated on grain boundary act to deflect the crack along the grain boundary even when inferior crack propagation resistance within grain boundary PFZ is not considered. The in-situ fracture strengths of several inclusions are also estimated in the lights of the numerical results. (C) 2000 Elsevier Science S.A. All rights reserved.

  • Mechanical analysis of toughness degradation due to premature fracture of course inclusions in wrought aluminium alloys Reviewed

    H. Toda, T. Kobayashi, A. Takahashi

    Materials Science and Engineering A   280 ( 1 )   69 - 75   2000.3

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    DOI: 10.1016/S0921-5093(99)00658-9

  • Effect of loading velocity and testing temperature on the fracture toughness of a SiCw/6061Al alloy composite Reviewed

    L. Wang, T. Kobayashi, H. Toda, M. Hayakawa

    Materials Science and Engineering A   280 ( 1 )   214 - 219   2000.3

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    DOI: 10.1016/S0921-5093(99)00669-3

  • Effect of loading velocity and testing temperature on the fracture toughness of a SiCw/6061Al alloy composite Reviewed

    L Wang, T Kobayashi, H Toda, M Hayakawa

    MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   280 ( 1 )   214 - 219   2000.3

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  • Fracture behaviour of TiC particles dispersed Al2O3 ceramics Reviewed International journal

    F. Kamiya, T. Kobayashi, H. Toda, M. Takasu, N. Okamoto

    Proceedings of the 10th IKETANI conference   365 - 366   2000.1

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  • Effects of striker shape and attached position of strain gage on measured load in Instrumented Charpy impact test Reviewed

    T. Kobayashi, M. Otani, S. Morita, H. Toda

    Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan   86 ( 9 )   595 - 601   2000.1

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    DOI: 10.2355/tetsutohagane1955.86.9_595

  • 溶湯攪拌法で作製したSiC/6061アルミニウム合金複合材料の超塑性に及ぼす圧延加工の影響 Reviewed

    彦坂武夫, 今井恒道, 小林俊郎, 戸田裕之

    軽金属   49 ( 12 )   600 - 606   1999.12

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  • Initiation stress of delamination cracking in A2091 Al-Li alloy Reviewed

    A. Takahashi, T. Kobayashi, H. Toda

    International Journal of Materials and Product Technology   14 ( 2-4 )   217 - 228   1999.12

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  • Effect of CTBN addition on mechanical properties of epoxy resins filled with SiO2 particles Reviewed

    T. Kobayashi, T. Higashihara, H. Yamaya, K. Hosoi, H. Toda

    Zairyo/Journal of the Society of Materials Science, Japan   48 ( 12 )   1386 - 1392   1999.12

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    DOI: 10.2472/jsms.48.1386

  • シリカ充填エポキシ樹脂の力学的特性に及ぼすゴム変成の影響 Reviewed

    小林俊郎, 東原隆, 山谷勇登, 細井一良, 戸田裕之

    材料   48 ( 12 )   1386 - 1392   1999.12

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  • Effects of loading velocity on fracture toughness of a SiCw/A6061 composite at elevated temperatures Reviewed International journal

    L. Wang, T. Kobayashi, H. Toda, M. Hayakawa

    Materials Transactions, JIM   40 ( 10 )   1056 - 1062   1999.10

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  • Effects of loading velocity on fracture toughness of a SiCw/A6061 composite at elevated temperatures Reviewed

    L. Wang, T. Kobayashi, H. Toda, M. Hayakawa

    Materials Transactions, JIM   40 ( 10 )   1056 - 1062   1999.10

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    DOI: 10.2320/matertrans1989.40.1056

  • Al-Si-Cu合金鋳物の疲労亀裂伝播特性に及ぼすミクロ組織の影響 Reviewed

    姚強, 小林俊郎, 戸田裕之, 北岡山治

    軽金属   49 ( 9 )   443 - 449   1999.9

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  • 2091アルミニウム合金の層状割れ発生基準 Reviewed

    高橋明宏, 小林俊郎, 戸田裕之

    軽金属   46 ( 6 )   249 - 252   1999.6

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  • Stress criterion of delamination cracking in 2091 aluminum alloys Reviewed

    A. Takahashi, T. Kobayashi, H. Toda

    Keikinzoku/Journal of Japan Institute of Light Metals   49 ( 6 )   249 - 252   1999.6

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    DOI: 10.2464/jilm.49.249

  • バイモーダルな粒子形状及びサイズ分布を有するシリカ粒子充填エポキシ樹脂の疲労特性 Reviewed

    小林俊郎, 東原隆, 山谷勇登, 細井一良, 戸田裕之

    材料科学   36 ( 6 )   320 - 326   1999.6

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  • Al-Li系合金の破壊挙動に及ぼす介在物の影響のSEM内その場観察 Reviewed

    高橋明宏, 小林俊郎, 戸田裕之

    軽金属   49 ( 4 )   166 - 171   1999.4

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  • Fabrication process of metal matrix composite with nano-size SiC particle produced by vortex method Reviewed

    A. Kawabe, A. Oshida, T. Kobayashi, H. Toda

    Keikinzoku/Journal of Japan Institute of Light Metals   49 ( 4 )   149 - 154   1999.4

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    DOI: 10.2464/jilm.49.149

  • 溶湯攪拌法によるナノサイズSiC粒子のアルミニウム合金への複合化 Reviewed

    河部昭雄, 押田篤, 小林俊郎, 戸田裕之

    軽金属   49 ( 4 )   149 - 154   1999.4

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  • Initiation stress of delamination cracking in A2091 Al-Li alloy Reviewed International journal

    A. Takahashi, T. Kobayashi, H. Toda

    International Journal of Materials and Product Technology   14 ( 2/3/4 )   217 - 228   1999.2

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  • Micromechanisms of fracture in wrought aluminum alloy containing coarse inclusion particles Reviewed International journal

    H. Toda, T. Kobayashi, A. Takahashi

    Aluminum Transactions   1 ( 1 )   109 - 116   1999.1

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  • In-situ SEM study on effect of inclusion particles on fracture behavior in Al-Li system alloy Reviewed

    A. Takahashi, T. Kobayashi, H. Toda

    Keikinzoku/Journal of Japan Institute of Light Metals   49 ( 4 )   166 - 171   1999.1

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    DOI: 10.2464/jilm.49.166

  • Effect of the hot roll working on the superplasticity of the SiCp/6061 aluminum alloy composite made by a Vortex method Reviewed

    T. Hikosaka, T. Imai, T. Kobayashi, H. Toda

    Keikinzoku/Journal of Japan Institute of Light Metals   49 ( 12 )   600 - 606   1999.1

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    DOI: 10.2464/jilm.49.600

  • Effect of specimen size on the load calibration in the instrumented impact test Reviewed

    T. Kobayashi, N. Inoue, A. Sakaguchi, H. Toda

    Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan   85 ( 1 )   78 - 83   1999.1

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    DOI: 10.2355/tetsutohagane1955.85.1_78

  • Effect of microstructure on fatigue crack propagation characteristic of Al-Si-Cu die casting alloys Reviewed

    Q. Yao, T. Kobayashi, H. Toda, S. Kitaoka

    Unknown Journal   49 ( 9 )   443 - 449   1999.1

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    DOI: 10.2464/jilm.49.443

  • 計装化シャルピー衝撃試験における荷重較正と試験片サイズの影響 Reviewed

    小林俊郎, 井上 直也, 坂口明, 戸田裕之

    鉄と鋼   85 ( 1 )   78 - 83   1999.1

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    DOI: 10.2355/tetsutohagane1955.85.1_78

  • Cyclic creep behavior of SiCw/6061Al composites at high temperatures Reviewed

    P. L. Liu, Z. G. Wang, H. Toda, T. Kobayashi

    Key Engineering Materials   ( 149 PART II )   655 - 660   1998.12

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  • The cyclic creep behavior of SiCw/6061 Al composite at high temperatures Reviewed International journal

    P.L.Liu, Z.G.Wang, H. Toda, T. Kobayashi

    Key Engineering Materials   145-149 ( 1&2 )   655 - 660   1998.11

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  • Finite element analysis of observed high strengthening in composites with regularly segregated microstructures Reviewed

    H Toda, T Gouda, T Kobayashi

    MATERIALS SCIENCE AND TECHNOLOGY   14 ( 9-10 )   925 - 932   1998.9

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  • Finite element analysis of observed high strengthening in composites with regularly segregated microstructures Reviewed

    H. Toda, T. Gouda, T. Kobayashi

    Materials Science and Technology   14 ( 9--10 )   925 - 932   1998.9

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  • Numerical analysis of crack initiation and propagation behavior in aluminum matrix composites Reviewed International journal

    H. Toda, T. Kobayashi, T. Goda

    Proceedings of 6th International Conference on Aluminum Alloys, Their Physical and Mechanical Properties   1873 - 1878   1998.7

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  • Strain rate dependence of impact tensile properties in 6061 aluminum alloy Reviewed International journal

    S. Morita, T. Kobayashi, H. Toda

    Proceedings of 6th International Conference on Aluminum Alloys, Their Physical and Mechanical Properties   1998.7

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  • Fatigue behavior in Al-Si-Cu die cast alloys Reviewed International journal

    Q. Yao, T. Kobayashi, H. Toda, S. Kitaoka

    Proceedings of 6th International Conference on Aluminum Alloys, Their Physical and Mechanical Properties   1373 - 1378   1998.7

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  • Impact tension properties in A2091 aluminum-lithium alloy Reviewed International journal

    A. Takahashi, T. Kobayashi, H. Toda

    Proceedings of 6th International Conference on Aluminum Alloys, Their Physical and Mechanical Properties   505 - 510   1998.7

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  • Effects of microstructural variation on mechanical properties of hypereutectic Al-Si casting alloys Reviewed International journal

    H. Kojima, T. Kobayashi, H. Toda, Q. Yao

    Proceedings of 6th International Conference on Aluminum Alloys, Their Physical and Mechanical Properties   565 - 570   1998.7

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  • 強化材凝集部の導入によって二相混合組織とした複合材料における高強度発現機構 Reviewed

    戸田裕之, 小林俊郎, 田中幸哉, 合田孝志

    日本金属学会誌   62 ( 5 )   488 - 496   1998.5

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  • Effect of frequency on cyclic creep behavior of SiCw/6061 composite at high temperatures Reviewed

    P. Liu, Z. Wang, H. Toda, T. Kobayashi

    Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research   12 ( 2 )   213 - 216   1998.4

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  • Modeling and simulation of fracture behavior of MMC Reviewed International journal

    T. Kobayashi, H. Toda

    Proceedings of the EUROMEC 373 Colloquium, Modeling and control of adaptive mechanical structures, ADAMES   89 - 94   1998.3

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  • Superior strengthening mechanisms in dual phase composites having reinforcement agglomeration Reviewed

    H. Toda, T. Kobayashi, Y. Tanaka, T. Gouda

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   62 ( 5 )   488 - 496   1998.1

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    DOI: 10.2320/jinstmet1952.62.5_488

  • Toughness enhancement based on fracture mechanical simulation of Al-SiCw composite Reviewed

    T. Kobayashi, H. Toda

    Materials Science Forum   242   193 - 198   1997.12

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  • 鋳造鍛造アルミニウム合金鋳物の破壊靱性に及ぼすミクロ組織の影響 Reviewed

    姚強, 小林俊郎, 戸田裕之, 堀久司

    軽金属   47 ( 11 )   613 - 619   1997.11

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  • Static creep and cyclic creep behaviour of SiCw/6061Al and SiCp/2024Al composites at elevated temperature Reviewed

    P. Liu, Z. Wang, W. Wang, H. Toda, T. Kobayashi

    Jinshu Xuebao/Acta Metallurgica Sinica   33 ( 11 )   1231 - 1232   1997.11

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  • Effect of microstructure on fracture toughness of cast and forged aluminum casting alloys Reviewed

    Q. Yao, T. Kobayashi, H. Toda, H. Hori

    Keikinzoku/Journal of Japan Institute of Light Metals   47 ( 11 )   613 - 619   1997.11

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    DOI: 10.2464/jilm.47.613

  • Simulation of crack propagating in discontinuously reinforced metal matrix composite Reviewed International journal

    H. Toda, T. Kobayashi

    Metallurgical and Materials Transactions. A   28 ( 10 )   2149 - 2157   1997.10

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  • Simulation of crack propagating in discontinuously reinforced metal matrix composite Reviewed

    H Toda, T Kobayashi

    METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE   28 ( 10 )   2149 - 2157   1997.10

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  • Effect of frequency on cyclic creep of SiCw/6061Al composite at high temperatures Reviewed

    PL Liu, ZG Wang, H Toda, T Kobayashi

    JOURNAL OF MATERIALS SCIENCE LETTERS   16 ( 19 )   1603 - 1605   1997.10

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    DOI: 10.1023/A:1018532805098

  • Effect of frequency on cyclic creep of SiCw/6061Al composite at high temperatures Reviewed International journal

    P.L. Liu, Z.G. Wang, H. Toda, T. Kobayashi

    Journal of Materials Science Letters   16 ( 19 )   1603 - 1605   1997.10

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  • Toughness enhancement based on fracture mechanical simulation of Al-SiCw composite Reviewed International journal

    H. Toda, T. Kobayashi

    5th. International Conference on Aluminum Alloys, Their Physical and Mechanical Properties, Grenoble, Materials Science Forum   242   193 - 198   1997.9

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  • Effect of cyclic stress on the high temperature creep behavior of SiCw/6061Al composite Reviewed International journal

    P.L. Liu, Z.G. Wang, H. Toda, T. Kobayashi

    Scripta Metallurgica   36 ( 7 )   807 - 812   1997.4

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  • Effect of cyclic stress on the high temperature creep behavior of SiCw/6061Al composite Reviewed

    PL Liu, ZG Wang, H Toda, T Kobayashi

    SCRIPTA MATERIALIA   36 ( 7 )   807 - 812   1997.4

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    DOI: 10.1016/S1359-6462(96)00454-X

  • アルミニウム合金基複合材料の変形特性に及ぼすマトリクス不均質ミクロ組織の影響の数値解析 Reviewed

    戸田裕之, 小林俊郎, 井上直也

    日本金属学会誌   61 ( 2 )   120 - 127   1997.2

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  • Numerical analysis of effects of inhomogeneous matrix microstructures on deformation characteristics in aluminum matrix composites Reviewed

    H. Toda, T. Kobayashi, N. Inoue

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   61 ( 2 )   120 - 127   1997.1

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    DOI: 10.2320/jinstmet1952.61.2_120

  • Improvement of mechanical properties by RRA treatment in AL-SiCw composite Reviewed

    T. Kobayashi, H. Toda

    Materials Science Forum   217-222 ( PART 2 )   1127 - 1132   1996.12

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  • Enhancement of mechanical properties by RRA treatment Reviewed International journal

    T. Kobayashi, H. Toda

    Proceedings of 5th International Symposium on Processing and Fabrication of Advanced Materials   255 - 264   1996.10

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  • Cyclic deformation and low cycle fatigue behavior in a SiCw/6061Al composite at elevated temperature Reviewed

    L Wang, ZM Sun, T Kobayashi, H Toda

    MATERIALS TRANSACTIONS JIM   37 ( 10 )   1561 - 1567   1996.10

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    Cyclic deformation and low cycle fatigue behavior in a SiCw/6061Al composite at elevated temperature
    The cyclic deformation and low cycle fatigue behavior of a SiC whisker reinforced 6061 aluminum alloy matrix composite were investigated at elevated temperatures with total strain controlled method. TEM and SEM were used to examine the microstructure and fracture surfaces of the specimens. The mechanical test results demonstrated that the composite materials maintained initial cyclic hardening at the elevated temperature. The fatigue resistance to cyclic strain of the composite was found to be inferior to that of the matrix material in the total strain controlled testing, while the composite material showed superior fatigue strength in the low cycle fatigue region within the temperature range in the present research. The fatigue failure of the composite is believed to be caused by a mechanism of nucleation, growth and coalescence of voids.

    DOI: 10.2320/matertrans1989.37.1561

  • Growth behavior of microstructurally short cracks in the 6061 aluminum alloy with and without 22 vol pct SiC whiskers Reviewed International journal

    H. Toda, T. Kobayashi

    Metallurgical and Materials Transactions. A   27 ( 7 )   2013 - 2021   1996.7

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  • Growth behavior of microstructurally short cracks in the 6061 aluminum alloy with and without 22 vol pct SiC whiskers Reviewed

    H Toda, T Kobayashi

    METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE   27 ( 7 )   2013 - 2021   1996.7

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    DOI: 10.1007/BF02651950

  • Improvement of mechanical properties of Al-SiCw composite by RRA treatment Reviewed International journal

    T. Kobayashi, H. Toda

    5th. International Conference on Aluminum Alloys, Their Physical and Mechanical Properties, Grenoble, Materials Science Forum   217-222   1127 - 1132   1996.7

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  • Cyclic deformation and low cycle fatigue behavior in a 6061A1/22vol% SiC whisker composite Reviewed International journal

    L. Wang, Z.M. Sun, T. Kobayashi, H. Toda

    Materials Transactions JIM   37 ( 4 )   762 - 768   1996.4

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  • Cyclic deformation and low cycle fatigue behavior in a 6061Al/22vol% SiC whisker composite Reviewed

    L. Wang, Z. Sun, T. Kobayashi, H. Toda, Z. G. Wang

    Materials Transactions, JIM   37 ( 4 )   762 - 768   1996.1

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    DOI: 10.2320/matertrans1989.37.762

  • Designing principal to optimize strength of discontinuously-reinforced MMC Reviewed International journal

    H. Toda, Y. Shimasaki, I. Takada, S. Ishimori, T. Kobayashi

    8th. Pacific Conference on Automotive Engng., SAE Japan, Yokohama   2   265 - 270   1995.11

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  • ウィスカー強化MMCの変形特性に及ぼす強化材周囲におけるPFZ層の影響の有限要素法解析 Reviewed

    戸田裕之, 井上直也, 新村良子, 小林俊郎

    日本金属学会誌   59 ( 9 )   925 - 932   1995.9

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    DOI: https://doi.org/10.2320/jinstmet1952.59.9_925

  • Simulation of fracture behavior on Al-SiCw composite Reviewed International journal

    H. Toda, T. Kobayashi

    Proceedings of International Conference on Failure Analysis and Prevention, Failure Analysis and Prevention 1995,International Academic Publishers   225 - 235   1995.6

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  • 破壊力学シミュレーションによる金属基複合材料の破壊じん性評価とミクロ組織制御法の提案 Reviewed

    戸田裕之, 小林俊郎, 和田義治, 井上直也

    日本金属学会誌   59 ( 2 )   198 - 205   1995.2

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    DOI: https://doi.org/10.2320/jinstmet1952.59.2_198

  • 短繊維または粒子で強化した金属基複合材料中を伝播するき裂の破壊力学シミュレーション Reviewed

    戸田裕之, 小林俊郎, 和田義治

    日本金属学会誌   59 ( 1 )   94 - 102   1995.1

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  • Fracture mechanical simulation of a crack propagating in discontinuously-reinforced metal matrix composites Reviewed

    H. Toda, T. Kobayashi, Y. Wada

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   59 ( 1 )   94 - 102   1995.1

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    DOI: 10.2320/jinstmet1952.59.1_94

  • Fracture and fatigue in aluminum alloy matrix composite material Reviewed

    H. Toda, T. Kobayashi

    Journal of Japan Institute of Light Metals   45 ( 11 )   610 - 621   1995.1

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    DOI: 10.2464/jilm.45.610

  • 復元再時効処理によるSiCウィスカー強化アルミニウム合金複合材料のミクロ組織制御 Reviewed

    戸田裕之, 小林俊郎, 新家光雄

    日本金属学会誌   58 ( 9 )   1086 - 1094   1994.9

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  • Growth behavior of microstructurally-short cracks in the 6061 aluminum alloy reinforced with 22vol% SiC whisker Reviewed International journal

    H. Toda, T. Kobayashi

    Proceedings of 10th International Conference on Strength of Materials, J. Inst. Met.   525 - 528   1994.8

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  • SiCウィスカー強化6061アルミニウム合金複合材料の破壊特性に及ぼす時効処理の影響 Reviewed

    戸田裕之, 小林俊郎, 新家光雄

    日本金属学会誌   58 ( 4 )   468 - 475   1994.4

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  • SiCウィスカー強化6061合金複合材料のミクロ組織的微小疲労き裂の伝播 Reviewed

    戸田裕之, 小林俊郎

    日本金属学会誌   58 ( 3 )   337 - 345   1994.3

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  • Effects of aging treatments on fracture characteristics of 6061 aluminum alloy reinforced with SiC whisker Reviewed

    H. Toda, T. Kobayashi, M. Niinomi

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   58 ( 4 )   468 - 475   1994.1

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    DOI: 10.2320/jinstmet1952.58.4_468

  • Microstructurally-short fatigue crack in SiC whisker reinforced 6061 aluminum alloy composite Reviewed

    H. Toda, T. Kobayashi

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   58 ( 3 )   337 - 345   1994.1

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    DOI: 10.2320/jinstmet1952.58.3_337

  • Microstructural control by retrogression and reaging treatment in SiC whisker reinforced aluminum alloy composite Reviewed

    H. Toda, T. Kobayashi, M. Niinomi

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   58 ( 9 )   1086 - 1094   1994.1

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    DOI: 10.2320/jinstmet1952.58.9_1086

  • SiCウィスカー強化6061合金複合材料の時効析出挙動 Reviewed

    戸田裕之, 小林俊郎, 新家光雄

    日本金属学会誌   56 ( 11 )   1303 - 1311   1992.11

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  • SiCウィスカー強化6061合金複合材料の疲労き裂伝播特性 Reviewed

    戸田裕之, 小林俊郎

    日本金属学会誌   56 ( 11 )   1312 - 1321   1992.11

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  • SiC粒子6061アルミニウム合金複合材料の疲労き裂伝播特性 Reviewed

    小林俊郎, 岩成弘美, 袴田眞司, 新家光雄, 戸田裕之

    日本金属学会誌   55 ( 1 )   72 - 78   1991.1

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  • Fatigue crack propagation characteristics in SiCp/6061-T6 composite Reviewed

    T. Kobayashi, H. Iwanari, S. Hakamata, M. Niinomi, H. Toda

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   55 ( 1 )   72 - 78   1991.1

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    DOI: 10.2320/jinstmet1952.55.1_72

  • Study of damage behaviour of cast aluminium alloys fabricated through rheocasting Reviewed International journal

    N. Hayat, H. Toda, T. Kobayashi, N. Wade

    Proceedings of 9th International Conference on Semi-solid Processing of Alloys and Composites   245 - 250   1900

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  • Crack initiation and growth characteristics in the dynamic and static fracture toughness tests of SiC whisker / Al. alloy composite Reviewed International journal

    T. Kobayashi, H. Toda, M. Murakami

    Proceedings of 10th International Conference on Strength of Materials, J. Inst. Met.   529 - 532   1900

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  • Evaluation of fracture toughness and proposal of microstructurally-controlled composites by fracture-mechanical simulation Reviewed International journal

    T. Kobayashi, H. Toda

    Proceedings of International Symposium on Processing and Fabrication of Advanced Materials Ⅳ, TMS   69 - 78   1900

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  • Cyclic deformation and low cycle fatigue behaviors in a SiCw/6061 Al composite at different temperatures Reviewed International journal

    L. Wang, H. Toda, T. Kobayashi

    Proceedings of International Symposium on Advanced Engineering Material '97, Toyohashi, JSPS 156th Advanced Engineering Committee   553 - 558   1900

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  • Effects of PFZ layers around reinforcements on deformation behaviors in age-hardenable aluminum matrix composites Reviewed International journal

    H. Toda, N. Inoue, T. Kobayashi

    Proceedings of International Symposium on Advanced Engineering Material '97, Toyohashi, JSPS 156th Advanced Engineering Committee   577 - 582   1900

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  • Design and fabrication of shape memory alloy actuated titanium matrix composites Reviewed International journal

    H. Toda, T. Kobayashi, T. Hashizume

    Proceedings of European Congress on Advanced Materials and Processes. Metal Matrix Composites and Metallic Foams, (EUROMAT)   221 - 226   1900

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  • Fracture toughness of various zones in weldments of 6082 Al alloys Reviewed International journal

    V.A. Mosneaga, T. Kobayashi, H. Toda

    Proceedings of The 2nd International Conference on Light Materials for Transportation Systems   653 - 658   1900

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Books

  • X-Ray CT: Hardware and Software Techniques

    H. Toda( Role: Sole author)

    Springer Nature Singapore Pte Ltd.  2021.3 

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  • X線CT―産業・理工学でのトモグラフィー実践活用―

    戸田裕之( Role: Sole author)

    共立出版  2019.2 

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  • "Tomography using magnifying optics", Advanced Tomographic Methods in Materials Research and Engineering, Section 7.1 "Fresnel zone-plate microscopy and microtomography" in Chapter 7

    Y. Suzuki, H. Toda( Role: Joint author)

    Oxford University Press  2008.3 

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  • 「しなやかで強い鉄鋼材料」第3章第4節 位相コントラストイメージングによる二相鋼の破壊挙動解析

    戸田 裕之, SEO DOWON

    エヌ・ティー・エス  2016.12 

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    Language:Japanese  

  • 金属材料の加工と組織

    森永 正彦, 古原 忠, 戸田 裕之( Role: Edit)

    共立出版  2010.3 

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  • 最新フラクトグラフィー各種材料の破面解析とその事例 第2章1節アルミニウム合金のフラクトグラフィー

    戸田 裕之, 共著(全29名)( Role: Joint author)

    テクノシステム  2010.3 

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  • 多孔体の精密制御と機能・物性評価 36. 多孔質金属の力学的特性と破壊挙動

    戸田 裕之, 共著(全95名)( Role: Joint author)

    S&T出版株式会社  2008.3 

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  • プロフェッショナル英和辞典SPED TERRA(物質・工学編)

    堀内克明, 蟹江幸博, 他 -編

    小学館  2004.7 

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  • Metal and ceramic matrix composites

    Edited by, Brian Cantor, Fionn .P.E Dunne, Ian C Stone

    Institute of Physics Publishing, Bristol, UK  2003.11 

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    Metal and ceramic matrix composites

  • 「 アルミニウム合金の強度」 第3編 第6章アルミニウム基複合材料の強度特性(1)

    小林 俊郎, 戸田 裕之, 他11名( Role: Joint author)

    内田老鶴圃  2000.3 

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Presentations

  • Hydrogen embrittlement in Al-Zn-Mg alloys: Semi-spontaneous interfacial decohesion of precipitates Invited International conference

    H. Toda, M. Yamaguchi, T. Tsuru, K. Shimizu, H. Fujihara, K. Hirayama, K. Ebihara, K. Matsuda

    2022.9 

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    Event date: 2022.9

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  • Hydrogen embrittlement mechanism of Al-Zn-Mg alloys: semi-spontaneous interfacial decohesion Invited International conference

    H. Toda, M. Yamaguchi, T. Tsuru, K. Shimizu, K. Hirayama, K. Ebihara, K. Matsuda

    MRM2021 (Materials Research Meeting 2021)  2021.12 

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    Event date: 2021.12

    Language:English   Presentation type:Symposium, workshop panel (public)  

    Country:Japan  

    Other Link: https://mrm2021.jmru.org/

  • Application of high-resolution X-ray tomography to hydrogen embrittlement in aluminium Invited International conference

    H. Toda, K. Hirayama, K. Shimizu, K. Uesugi, A. Tkauchi

    ICAA17 (The 17th International Conference on Aluminium Alloys)  2020.10 

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    Event date: 2020.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:France  

  • Recent progress in high resolution X-ray tomography at high X-ray energies Invited International conference

    H. Toda, K, Hirayama, H. Su, K. Shimizu, O. Takakuwa, A. Takeuchi, K. Uesugi

    PRICM 10(The 10th Pacific Rim International Conference on Advanced Materials and Processing)  2019.8 

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    Event date: 2019.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:China  

  • Assessment of hydrogen embrittlement via in-situ imaging techniques in high Zn Al-Zn-Mg alloys Invited International conference

    H. Toda, H. Su, K. Shimizu, H. Fujihara, K. Hirayama, A. Takeuchi, K. Uesugi

    ECF22(22nd European Conference on Fracture)  2018.8 

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    Event date: 2018.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Application of high-resolution X-ray tomography to hydrogen embrittlement in aluminium Invited International conference

    H. Toda, K. Hirayama, K. Shimizu, K. Uesugi

    THERMEC'2018  2018.7 

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    Event date: 2018.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:France  

  • 4D hydrogen embrittlement behaviour in high strength aluminium alloy Invited

    H. Toda, K. Shimizu, H. Gao, K. Hirayama

    TMS 2018 Annual Meeting & Exhibition  2018.3 

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    Event date: 2018.3

    Language:English   Presentation type:Oral presentation (general)  

    Country:Other  

    4D Hydrogen Embrittlement Behaviour in High Strength Aluminium Alloy

  • Assessment of damage behavior of aluminum using diffraction-amalgamated grain boundary tracking technique Invited International conference

    H. Toda, K. Hirayama, M. Kobayashi, A. Takeuchi, K. Uesugi

    2017 MRS Fall meeting  2017.1 

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    Event date: 2017.1

    Language:English   Presentation type:Oral presentation (general)  

    Country:United States  

  • リバース4D材料エンジニアリングによる3D材料組織設計 Invited

    戸田裕之

    日本学術振興会 加工プロセスによる材料新機能発現 第176委員会 第31回研究会  2016.12 

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    Event date: 2016.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:エッサム神田ホール   Country:Japan  

  • Application of diffraction-amalgamated grain-boundary tracking to deforming aluminium polycrystals Invited International conference

    H. Toda, M. Kobayashi , K. Hirayama

    THERMEC 2016  2016.5 

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    Event date: 2016.5 - 2016.6

    Language:English  

    Country:Austria  

  • Origin of ductile fracture in aluminium alloys Invited

    H. Toda

    IUTAM Symposium on Plastic localization and ductile failure  2015.3 

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    Event date: 2015.3

    Language:English  

    Country:Other  

    Origin of ductile fracture in aluminium alloys

  • シンクロトロン放射光による構造材料損傷破壊挙動の3D/4D解析 Invited

    戸田裕之

    『3次元電子顕微鏡法がみせるナノとマクロの架け橋(材料系)』シンポジウム,公益社団法人日本顕微鏡学会第58回シンポジウム  2014.11 

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    Event date: 2014.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学病院   Country:Japan  

  • 鉄鋼における3D/4Dイメージングとその基盤技術 Invited

    戸田裕之

    『4Dイメージング実現による鉄鋼材料研究の飛躍的高度化』シンポジウム,日本鉄鋼協会秋季大会基調講演  2014.9 

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    Event date: 2014.9

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:名古屋大学 東山キャンパス   Country:Japan  

  • A new concept breakthrough in materials development: reverse 4D materials engineering Invited International conference

    H. Toda, M. Kobayashi, R. Batres, K. Shimizu, O. Kuwazuru

    Proceedings of the 5th International Symposium on Designing, Processing and Properties of Advanced Engineering Materials  2012.11 

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    Event date: 2012.11

    Language:English   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  • Development of diffraction-amalgamated grain-boundary tracking technique and its application to polycrystalline metals Invited International conference

    H. Toda, D. J. LeClere, T. Kamiko, Y. Suzuki, A. Takeuchi, K. Uesugi, M. Kobayashi

    Proceedings of SPIE  2012.8 

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    Event date: 2012.8

    Language:English   Presentation type:Symposium, workshop panel (public)  

    Country:United States  

  • X線CT画像からの高次情報抽出とその高密度マッピング Invited

    戸田裕之

    日本顕微鏡学会 第3回電子線トモグラフィ法チュートリアルプログラム ―トモグラフィから何が測れるか?(3次元測定の種類と阻害要因)―  2009.11 

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    Event date: 2009.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:工学院大学新宿校舎3階アーバンテックホール   Country:Japan  

  • 金属の3D・4Dイメージング Invited

    戸田裕之

    ワークショップ『高度X線イメージング材料科学の展開』―SPring-8光源性能を活かした応用技術開発の可能性―  2008.7 

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    Event date: 2008.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京ステーションコンファレンス   Country:Japan  

  • X線マイクロナノトモグラフィーによるミクロ組織3Dイメージングとその応用 Invited

    戸田裕之

    日本学術振興会 加工プロセスによる材料新機能発現 第176委員会 第7回研究会  2007.3 

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    Event date: 2007.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:新日本製鐵(株) 代々木倶楽部   Country:Japan  

  • アルミニウム鋳物の熱疲労に関する新しいアプローチと知見 Invited

    戸田裕之

    日本鋳造工学会 小林賞受賞記念講演  2006.5 

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    Event date: 2006.5

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  • 高分解能放射光CTによる軽金属材料の破壊挙動の定量評価 Invited

    戸田裕之

    日本金属学会 第134回春期大会基調講演  2004.3 

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    Event date: 2004.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Hydrogen embrittlement and its prevention in Al-Zn-Mg alloys Invited International conference

    H. Toda, Y. Wang, M. Yamaguchi, T. Tsuru, K. Ebihara, K. Shimizu, H. Fujihara, K. Hirayama

    European Conference on Fracture2024  2024.8 

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    Event date: 2024.8

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:MOZAIK EVENT CENTER, Zagreb, Croatia   Country:Croatia  

  • Multi-modal 3D image-based simulation of propagation behavior of intergranular crakcs in Al-Zn-Mg alloy International conference

    R. Higa, H. Fujihara, H. Toda, K. Ebihara, T. Mayama, M. Uesugi, A. Takeuchi

    European Conference on Fracture2024  2024.8 

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    Event date: 2024.8

    Language:English   Presentation type:Oral presentation (general)  

    Venue:MOZAIK EVENT CENTER, Zagreb, Croatia   Country:Croatia  

  • In situ 3D analysis for deformation-induced martensitic transformation in metastable austenitic alloy by synchrotron X-ray International conference

    T. Iwano, O. Takakuwa, K. Hirayama, H. Toda

    European Conference on Fracture2024  2024.8 

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    Event date: 2024.8

    Language:English   Presentation type:Oral presentation (general)  

    Venue:MOZAIK EVENT CENTER, Zagreb, Croatia   Country:Croatia  

  • Stress corrosion cracking of high strength Al-Zn-Mg-Cu alloy with Mn-rich dispersoid and T phase International conference

    J. Tang, Y. Wang, H. Fujihara, K. Shimizu, K. Hirayama, H. Toda

    19th International Conferences on Aluminum Alloys  2024.6 

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    Event date: 2024.6

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Atlanta,Georgia,USA   Country:United States  

  • Influence of internal and external hydrogen on stress corrosion cracking behavior in Al-Zn-Mg alloy International conference

    H. Fujihara, H. Toda, K. Ebihara, D. Shiozawa, M. Uesugi, A. Takeuchi

    19th International Conferences on Aluminum Alloys  2024.6 

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    Event date: 2024.6

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Atlanta,Georgia,USA   Country:United States  

  • 3D analysis of hydrogen embrittlement mechanism in Aluminium alloy by 3D-TEM observation International conference

    K. Hirayama, M. Doi, H. Toda, H. Fujihara, K. Shimizu

    19th International Conferences on Aluminum Alloys  2024.6 

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    Event date: 2024.6

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Atlanta,Georgia,USA   Country:United States  

  • Hydrogen-induced nanovoid and intergranular cracking in a novel Al-Zn-Mg-Cu alloy International conference

    K. Shimizu, H. Toda, M. Koyama, K. Hirayama, M. Uesugi, A. Takeuch

    19th International Conferences on Aluminum Alloys  2024.6 

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    Event date: 2024.6

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Atlanta,Georgia,USA   Country:United States  

  • Hydrogen-tolerant ultra-high-strength aluminum alloy International conference

    H. Toda, Y. Wang, J. Tang, H. Fujihara, N. Adachi, Y. Todaka

    19th International Conferences on Aluminum Alloys  2024.6  International Conferences on Aluminum Alloys

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    Event date: 2024.6

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Atlanta,Georgia,USA   Country:United States  

  • マルテンサイト鋼における損傷挙動の4Dマルチモーダル解析

    藤井翔太,戸田裕之,藤原比呂,石川恭平

    合同学術講演会  2024.6  日本金属学会九州支部、日本鉄鋼協会九州支部、軽金属学会九州支部

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    Event date: 2024.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学(筑紫キャンパス)   Country:Japan  

  • Al-Zn-Mg合⾦における⽔素脆化粒界⻲裂の発⽣挙動

    小森一樹,戸田裕之,藤原比呂,比嘉良太

    合同学術講演会  2024.6  日本金属学会九州支部、日本鉄鋼協会九州支部、軽金属学会九州支部

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    Event date: 2024.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学(筑紫キャンパス)   Country:Japan  

  • Al-Zn-Mg合⾦の疲労破壊における⽔素環境の影響

    稲森彰人,藤原比呂,戸田裕之,清水一行,竹内晃久,上椙真之

    合同学術講演会  2024.6  日本金属学会九州支部、日本鉄鋼協会九州支部、軽金属学会九州支部

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    Event date: 2024.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学(筑紫キャンパス)   Country:Japan  

  • HPT加⼯を施したAl-Zn-Mg合⾦の⽔素脆化挙動とその防⽌

    竹田昌輝,藤原比呂,Wang Yafei,戸田裕之,戸高義一,足立望,竹内晃久,上椙真之,Xu Yuantao

    合同学術講演会  2024.6  日本金属学会九州支部、日本鉄鋼協会九州支部、軽金属学会九州支部

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    Event date: 2024.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学(筑紫キャンパス)   Country:Japan  

  • Al-Zn-Mg合金の疲労破壊における水素環境の影響

    稲森彰人,藤原比呂,戸田裕之,清水一行,竹内晃久,上椙真之

    軽金属学会第146回春期大会  2024.5 

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    Event date: 2024.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学 東山キャンパス(名古屋市)   Country:Japan  

  • Zn・Mg濃度を変化させたT相析出型Al-Zn-Mg-Cu合金の水素脆性挙動

    清水一行,八重樫祥之,戸田裕之,藤原比呂,上椙真之,竹内晃久

    軽金属学会第146回春期大会  2024.5 

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    Event date: 2024.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学 東山キャンパス(名古屋市)   Country:Japan  

  • 3D-TEMを用いたAl-Zn-Mg合金の水素脆化挙動の3D解析

    平山恭介,土井実春,戸田裕之,藤原比呂,清水一行

    軽金属学会第146回春期大会  2024.5 

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    Event date: 2024.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学 東山キャンパス(名古屋市)   Country:Japan  

  • Al-Zn-Mg合金における粒界亀裂進展挙動のマルチモーダル3Dイメージベース解析

    比嘉良太,藤原比呂,戸田裕之,海老原健一,眞山剛,平山恭介,清水一行,竹内晃久,上椙真之

    軽金属学会第146回春期大会  2024.5 

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    Event date: 2024.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学 東山キャンパス(名古屋市)   Country:Japan  

  • Al-Zn-Mg合金の応力腐食割れ挙動に及ぼす局所水素集積の影響

    藤原比呂,戸田裕之,塩澤大輝,海老原健一,眞山剛,平山恭介,清水一行,竹内晃久,上椙真之

    軽金属学会第146回春期大会  2024.5 

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    Event date: 2024.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学 東山キャンパス(名古屋市)   Country:Japan  

  • HPT加工を施したAl-Zn-Mg合金の水素脆化防止

    竹田昌輝,藤原比呂,Wang Yafei,戸田裕之,戸高義一,足立望,竹内晃久,上椙真之

    軽金属学会第146回春期大会  2024.5 

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    Event date: 2024.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学 東山キャンパス(名古屋市)   Country:Japan  

  • 3DAPによるAl-Zn-Mg合金中の粒界・粒内析出物のトラップ水素解析

    阿部李音,清水一行,佐々木泰祐,戸田裕之,鎌田康寛

    軽金属学会第146回春期大会  2024.5 

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    Event date: 2024.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学 東山キャンパス(名古屋市)   Country:Japan  

  • 5000系/7000系クロスオーバーアルミニウム合金の水素脆性解析

    土屋昇大,清水一行,鎌田康寛,戸田裕之,藤原比呂,小山元道,上椙真之,竹内晃久

    軽金属学会第146回春期大会  2024.5 

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    Event date: 2024.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学 東山キャンパス(名古屋市)   Country:Japan  

  • Surrogate-based Optimization for Fatigue Crack Initiation Behavior in Ti-6Al-4V Alloy

    2024.3 

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    Event date: 2024.3

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 曲げ変形を受けるTRIP鋼のγ変態挙動のマルチモーダル解析

    竹藤剛,戸田裕之,藤原比呂,石川恭平,平山恭介,竹内晃久

    日本鉄鋼協会 第187回春期講演大会  2024.3 

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京理科大学 葛飾キャンパス   Country:Japan  

  • Al-Zn-Mg合金における粒界亀裂進展挙動のマルチモーダル3Dイメージベース解析

    比嘉良太,藤原比呂,戸田裕之,海老原健一,眞山剛

    日本金属学会春期(第174回)講演大会  2024.3 

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京理科大学 葛飾キャンパス   Country:Japan  

  • 水素脆化による粒界亀裂の結晶学的発生挙動のメタモデル解析

    小森一樹,藤原比呂,戸田裕之

    日本機械学会 九州支部 九州学生会第55回学生員卒業研究発表講演会  2024.3 

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:琉球大学   Country:Japan  

  • マルテンサイト鋼における損傷挙動の4Dマルチモーダル解析

    藤井翔太,藤原比呂,戸田裕之,石川恭平

    日本機械学会 九州支部 九州学生会第55回学生員卒業研究発表講演会  2024.3 

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:琉球大学   Country:Japan  

  • HPT加工を施した高強度化Al-Zn-Mg合金における水素脆化防止

    竹田昌輝,藤原比呂,戸田裕之,戸高義一,足立望

    日本機械学会 九州支部 九州学生会第55回学生員卒業研究発表講演会  2024.3 

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    Event date: 2024.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:琉球大学   Country:Japan  

  • Analysis of hydrogen embrittlement mechanism in Al-Zn-Mg alloy by TEM observation International conference

    K. Hirayama, M. Doi, H. Toda, H. Fujihara, K. Shimizu

    Materials Research Meeting 2023  2023.12 

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    Event date: 2023.12

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Hydrogen embrittlement and its prevention in Al-Zn-Mg alloys Invited International conference

    H. Toda, Y. Wang, J. Tang, M. Yamaguchi, T. Tsuru, K. Shimizu, H. Fujihara, K. Hirayama, K. Ebihara

    Materials Research Meeting 2023  2023.12 

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    Event date: 2023.12

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Development of hydrogen-resistant Al-Zn-Mg-Cu alloys by T-phase precipitation and trace element addition International conference

    K. Shimizu, S. Tsuchiya, H. Toda, H. Fujihara, M. Uesugi, A. Takeuchi, Y. Kamada

    Materials Research Meeting 2023  2023.12 

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    Event date: 2023.12

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Stress corrosion cracking of high strength Al-Zn-Mg-Cu alloy with Mn-rich dispersoid and T(Al2Mg3Zn3) Phase International conference

    J. Tang, Y. Wang, H. Fujihara, K. Hirayama, K. Shimizu, H. Toda

    Materials Research Meeting 2023  2023.12 

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    Event date: 2023.12

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Hydrogen embrittlement of ultra-fine-grained Al-Zn-Mg-Cu alloys processed by high pressure torsion International conference

    Y. Wang, N. Adachi, H. Fujihara, Y. Todaka, H. Toda

    Materials Research Meeting 2023  2023.12 

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    Event date: 2023.12

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Influence of internal and external hydrogen accumulation behavior on stress corrosion cracking behavior in Al-Zn-Mg alloy International conference

    H. Fujihara, H. Toda, K. Ebihara, M. Uesugi, A. Takeuchi

    Materials Research Meeting 2023  2023.12 

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    Event date: 2023.12

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Al-Zn-Mg合金の水素脆化挙動に対する内部および外部水素の影響

    藤原比呂,戸田裕之,海老原健一,平山恭介,清水一行,竹内晃久,上椙真之

    軽金属学会第145回秋期大会  2023.11 

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    Event date: 2023.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都立大学 南大沢キャンパス(東京都八王子市)   Country:Japan  

  • Al-Zn-Mg合金の電気Znめっきで生じる水素由来欠陥のX線μCTイメージング

    堀川敬太郎,日野実,清水一行,戸田裕之,星野真人,上杉健太朗

    軽金属学会第145回秋期大会  2023.11 

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    Event date: 2023.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都立大学 南大沢キャンパス(東京都八王子市)   Country:Japan  

  • ミュオンスピン緩和法と第一原理計算を利用したAl6Mn中の水素トラップ機構の解明

    西村克彦,松田健二,並木孝洋,布村紀男,土屋大樹,髭本亘,都留智仁,清水一行,戸田裕之

    軽金属学会第145回秋期大会  2023.11 

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    Event date: 2023.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都立大学 南大沢キャンパス(東京都八王子市)   Country:Japan  

  • Stress Corrosion Cracking of High Strength Al-Zn-Mg-Cu Alloy with Mn-rich Dispersoid and T Phase

    J. Tang, Y. Wang, H. Fujihara, K. Shimizu, K. Hirayama, A. Takeuchi, M. Uesugi, H. Toda

    2023.11 

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    Event date: 2023.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Hydrogen embrittlement suppression for high-strength nanostructured aluminum alloys

    Y. Wang, J. Tang, N. Adachi, H. Fujihara, Y. Todaka, K. Shimizu, K. Hirayama, H. Toda

    2023.11 

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    Event date: 2023.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 結晶塑性有限要素法と水素拡散解析によるAl-Zn-Mg合金の粒界亀裂進展挙動の評価

    比嘉良太,藤原比呂,戸田裕之,海老原健一,小林正和,竹内晃久,上椙真之

    軽金属学会第145回秋期大会  2023.11 

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    Event date: 2023.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都立大学 南大沢キャンパス(東京都八王子市)   Country:Japan  

  • Microstructure Analysis of Al-Zn-MgAlloys with Low Zn/Mg ratio

    2023.11 

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    Event date: 2023.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 5000系/7000系クロスオーバーアルミニウム合金の時効析出と耐水素脆性

    清水一行,土屋昇大,戸田裕之,藤原比呂,平山恭介,竹内晃久,上椙真之

    軽金属学会第145回秋期大会  2023.11 

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    Event date: 2023.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京都立大学 南大沢キャンパス(東京都八王子市)   Country:Japan  

  • Hydrogen embrittlement of ultra-finegrained Al-Zn-Mg-Cu alloys processed by high pressure torsion International conference

    Y. Wang, J. Tang, H. Fujihara, N. Adachi, Y. Todaka, A. Takeuchi, M. Uesugi, H. Toda

    2023.10 

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    Event date: 2023.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Multi-modal measurements of 3D crystallographic transformation behaviour in TRIP steel International conference

    H. Toda, C. Koga, H. Fujihara, A. Takeuchi, M. Uesugi, K. Ishikawa

    2023.10 

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    Event date: 2023.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Assessment of hydrogen embrittlement behavior in Al-Zn-Mg alloy via multimodal 3D image-based analysis International conference

    H. Fujihara, H. Toda, K. Ebihara, M. Kobayashi, M. Uesugi, A. Takeuchi

    2023.10 

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    Event date: 2023.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Influence of crystal plasticity and hydrogen diffusion under stress on intergranular crack propagation in Al-Zn-Mg alloy International conference

    R. Higa, H. Fujihara, H. Toda, K. Ebihara, M. Kobayashi

    2023.10 

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    Event date: 2023.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Deformation and fracture behavior of T-phase precipitated Al-Zn-Mg alloys under hydrogen influence using synchrotron imaging International conference

    K. Shimizu, S. Tsuchiya, H. Toda, H. Fujihara, M. Uesugi, A. Takeuchi, Y. Kamada

    2023.10 

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    Event date: 2023.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Stress corrosion cracking of high strength Al-Zn-Mg-Cu alloy with mnrich dispersoid and T phase International conference

    J. Tang, Y. Wang, H. Fujihara, K. Hirayama, K. Shimizu, H. Toda

    2023.10 

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    Event date: 2023.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 3D measurement of internal microstructures of Al-Zn-Mg based alloy with Ni-P plating by means of synchrotron X-ray CT International conference

    K. Horikawa, M. Hino, K. Shimizu, H. Toda, M. Hoshino, K. Uesugi

    2023.10 

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    Event date: 2023.10

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • T相優先析出によるAl-Zn-Mg-Cu合金における水素誘起粒界・擬へき開破壊の防止

    清水一行,土屋昇大,戸田裕之,藤原比呂,上椙真之,竹内晃久,鎌田康寛

    日本機械学会 M&M2023材料力学カンファレンス  2023.9 

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    Event date: 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:筑波大学 筑波キャンパス   Country:Japan  

  • Al-Zn-Mg合金の応力腐食割れ挙動に対する内部および外部水素の影響

    藤原比呂,戸田裕之,海老原健一,平山恭介,清水一行

    日本機械学会 M&M2023材料力学カンファレンス  2023.9 

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    Event date: 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:筑波大学 筑波キャンパス   Country:Japan  

  • Al-Zn-Mg 合金の粒界亀裂進展に及ぼす水素濃化挙動の影響

    比嘉良太,藤原比呂,戸田裕之,海老原健一,平山恭介,清水一行

    日本機械学会 M&M2023材料力学カンファレンス  2023.9 

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    Event date: 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:筑波大学 筑波キャンパス   Country:Japan  

  • Al-Zn-Mg系合金の表面改質で導入される水素由来欠陥の放射光X線CT解析

    堀川敬太郎,日野実,清水一行,戸田裕之,星野真人,上杉健太朗

    日本機械学会 M&M2023材料力学カンファレンス  2023.9 

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    Event date: 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:筑波大学 筑波キャンパス   Country:Japan  

  • 透過電子顕微鏡観察によるアルミニウム合金の水素脆化メカニズム解析

    平山恭介,土井実春,戸田裕之,藤原比呂,清水一行

    日本機械学会 M&M2023材料力学カンファレンス  2023.9 

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    Event date: 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:筑波大学 筑波キャンパス   Country:Japan  

  • TRIP鋼の曲げ負荷中における損傷破壊挙動のマルチモーダル解析

    竹藤剛,戸田裕之,藤原比呂, 石川恭平

    日本鉄鋼協会 第186回秋季講演大会  2023.9 

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    Event date: 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:富山大学 五福キャンパス   Country:Japan  

  • Prevention of hydrogen embrittlement in Al-Zn-Mg alloys by dispersion of novel phases International conference

    K. Shimizu, Y. Wang, H. Fujihara, H. Toda, M. Yamaguchi, M. Uesugi, A. Takeuchi

    2023.9 

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    Event date: 2023.9

    Language:English  

    Country:United States  

  • Assessment of hydrogen embrittlement behavior in Al-Zn-Mg alloys by multimodal 3D image-based simulation International conference

    H. Fujihara, H. Toda, K. Ebihara, M. Kobayashi, K. Shimizu, A. Takeuchi, M. Uesugi

    2023.9 

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    Event date: 2023.9

    Language:English  

    Country:United States  

  • Role of T phase in the hydrogen embrittlement suppression for Al-Zn-Mg-Cu alloys International conference

    Y. Wang, B. Sharma, Y. Xu, K. Shimizu, H. Fujihara, H. Toda

    2023.9 

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    Event date: 2023.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:United States  

  • Microstructure observation of Al-Zn-Mg alloy with high Mg content International conference

    A. Ahmed, S. Lee, T. Tsuchiya, K. Matsuda, K. Nishimura, N. Numomura, H. Toda, K. Hirayama, K. Shimizu, M. Yamaguchi, T. Tsuru, M. Itakura

    2023.7 

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    Event date: 2023.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Austria  

  • μ-CT法を用いた引張試験中におけるCFRPの観察及び解析

    伊藤孝憲,永見裕介,加藤淳,竹内晃久,上椙真之,平山恭介,戸田裕之

    自動車技術会2023年春季大会  2023.5 

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    Event date: 2023.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:パシフィコ横浜   Country:Japan  

  • K吸収端差分イメージングによるAl-Zn-Mg-Cu合金中の3D/4D粒子損傷解析

    八重樫祥之,清水一行,鎌田康寛,戸田裕之,上椙真之,竹内晃久

    軽金属学会第144回春期大会  2023.5 

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    Event date: 2023.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:香川大学 幸町キャンパス   Country:Japan  

  • Elucidating the Microstructure of Al-Zn-Mg Alloys with Low Zn/Mg ratio

    A. Abrar, S. Lee, T. Tsuchiya, K. Matsuda, K. Nishimura, N. Numomura, H. Toda, K. Hirayama, K. Shimizu, M. Yamaguchi, T. Tsuru, M. Itakura

    2023.5 

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    Event date: 2023.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 7000系アルミニウム合金の4D 応力腐食割れ特性

    藤原比呂,本山裕登,戸田裕之,海老原健一,竹内晃久,上椙真之

    軽金属学会第144回春期大会  2023.5 

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    Event date: 2023.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:香川大学 幸町キャンパス   Country:Japan  

  • Al-Zn-Mg合金における水素脆化による擬へき開破壊メカニズムの解明

    土井実春,平山恭介,戸田裕之

    軽金属学会第144回春期大会  2023.5 

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    Event date: 2023.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:香川大学 幸町キャンパス   Country:Japan  

  • 放射光X線CTを用いた無電解Ni-PめっきAl-Zn-Mg合金の表面近傍組織の解析

    堀川敬太郎,日野実,清水一行,戸田裕之,星野真人,上杉健太朗

    軽金属学会第144回春期大会  2023.5 

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    Event date: 2023.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:香川大学 幸町キャンパス   Country:Japan  

  • 三次元アトムプローブによるAlZn-Mg合金中のトラップ水素解析

    阿部李音,清水一行,佐々木泰祐,戸田裕之,鎌田康寛

    軽金属学会第144回春期大会  2023.5 

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    Event date: 2023.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:香川大学   Country:Japan  

  • T相析出型Al-Zn-Mg合金の水素脆性におけるZr添加の影響

    土屋昇大,清水一行,鎌田康寛,戸田裕之,藤原比呂,上椙真之,竹内晃久

    軽金属学会第144回春期大会  2023.5 

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    Event date: 2023.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:香川大学 幸町キャンパス   Country:Japan  

  • X線マルチモーダル計測によるTRIP鋼の加工誘起変態および損傷破壊挙動評価

    古賀智遥, 戸田裕之, 藤原比呂, 石川恭平, 平山恭介

    日本鉄鋼協会 第185回春期講演大会  2023.3 

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    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京大学 駒場Ⅰキャンパス   Country:Japan  

  • Al-Zn-Mg 合金の水素脆化メカニズムの透過型電子顕微鏡観察による実験的解析

    平山恭介,土井実春,戸田裕之,清水一行,藤原比呂

    日本金属学会春期(第172回)講演大会  2023.3 

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    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京大学 駒場Ⅰキャンパス   Country:Japan  

  • 構造材料の3D/4D損傷・破壊挙動とその制御 Invited

    戸田裕之

    日本金属学会春期(第172回)講演大会  2023.3 

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    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:東京大学 駒場Ⅰキャンパス   Country:Japan  

  • Observation of microstructure morphology in Al-Zn-Mg alloy with low Zn/Mg ratio

    A. Ahmed, S. Lee, T. Tsuchiya, K. Matsuda, K. Nishimura, N. Numomura, H. Toda, K. Hirayama, K. Shimizu, M. Yamaguchi, T. Tsuru, M. Itakura

    2023.3 

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    Event date: 2023.3

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 放射光X線CTによる無電解Ni-Pめっき7075-T6アルミニウム合金の内部構造解析

    堀川敬太郎,日野実,清水一行,戸田裕之,星野真人,上杉健太朗

    日本金属学会春期(第172回)講演大会  2023.3 

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    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京大学 駒場Ⅰキャンパス   Country:Japan  

  • Al-Zn-Mg 合金中のT相優先析出による水素脆化防止挙動

    清水一行,土屋昇大,戸田裕之,藤原比呂,平山恭介

    日本金属学会春期(第172回)講演大会  2023.3 

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    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京大学 駒場Ⅰキャンパス   Country:Japan  

  • シンクロトロン光を用いたX線CT技術とその軽金属への応用 Invited

    戸田裕之

    2022年度第2回あいちSRセミナー  2022.12 

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