Updated on 2024/09/13

Information

 

写真a

 
KAWAHARA YASUHITO
 
Organization
Faculty of Engineering Department of Materials Science and Engineering Assistant Professor
School of Engineering (Joint Appointment)
Title
Assistant Professor
Contact information
メールアドレス
Tel
0928022969
Profile
金属材料特性と微細構造の間には密接な相関があることから、微細構造の詳細な理解に基づく材料組織制御が重要である。特に近年、金属材料において、組織設計が原子スケールにまで及んでいることを鑑みると、金属材料に添加された合金元素の存在状態や、金属材料中に発現した結晶欠陥構造を原子スケールで理解し、金属材料特性と相関づけることが必要不可欠であると考えられる。そこで私は、透過型電子顕微鏡(TEM)を用いることにより、TEM内その場引張・加熱観察や原子分解能TEM観察などを行うことで、金属材料における微細構造を原子スケールで理解し、かつ金属材料の加工熱処理に伴う微細構造の変化を追随することで、未解明であった金属材料特性の起源の解明に取り組んでいる。

Research Areas

  • Nanotechnology/Materials / Metallic material properties

  • Nanotechnology/Materials / Inorganic materials and properties

  • Nanotechnology/Materials / Structural materials and functional materials

Degree

  • Ph.D

Research History

  • Kyushu University Faculty of Engineering Assistant Professor

    2024.4 - Present

      More details

  • Japan Society for the Promotion of Science

    2023.10 - 2024.3

      More details

  • Japan Society for the Promotion of Science

    2021.4 - 2023.9

      More details

Education

  • Kyushu University   Faculty of Engineering

    2021.4 - 2023.9

      More details

Research Interests・Research Keywords

  • Research theme:金属材料

    Keyword:金属材料

    Research period: 2024

  • Research theme:透過型電子顕微鏡

    Keyword:透過型電子顕微鏡

    Research period: 2024

  • Research theme:転位

    Keyword:転位

    Research period: 2024

  • Research theme:析出

    Keyword:析出

    Research period: 2024

  • Research theme:クラスタ―

    Keyword:クラスタ―

    Research period: 2024

  • Research theme:Nano-structural characterization of metallic materials by 4D-STEM

    Keyword:low-carbon steel, austenitic stainless steel, aluminum alloy, cluster, dislocation, scanning transmission electron microscopy, 4D-STEM

    Research period: 2022.9

  • Research theme:The interaction between clusters and dislocations in metallic materials

    Keyword:low-carbon steel, austenitic stainless steel, aluminum alloy, cluster, dislocation, transmission electron microscopy

    Research period: 2021.4

Awards

  • The Awards for Excellent Academic Research

    2023.9   Kyushu University  

     More details

  • ICAS2022 Poster Award

    2022.5   ICAS2022  

  • エネルギーウィーク2022 奨励賞

    2022.1   エネルギーウィーク2022  

  • エネルギーウィーク2022 奨励賞

    2022.1   エネルギーウィーク2022  

     More details

  • 優秀口頭発表賞(第64回シンポジウム)

    2021.11   日本顕微鏡学会  

  • Paper Award Kyushu MMIJ(2021年度講演大会)

    2021.5   資源・素材学会九州支部  

  • 努力賞(第180回春季大会)

    2021.3   日本鉄鋼協会  

  • エネルギーウィーク2021 銅賞

    2021.1   エネルギーウィーク2021  

  • Paper Award Kyushu MMIJ(2020年度講演大会)

    2020.5   資源・素材学会九州支部  

  • ポスター優秀発表賞(2019年度講演大会)

    2019.12   日本顕微鏡学会九州支部  

  • Outstanding Student Award Kyushu MMIJ

    2019.3  

▼display all

Papers

  • Combined effect of interstitial-substitutional elements on dislocation dynamics in nitrogen-added austenitic stainless steels

    Yasuhito Kawahara, Shunya Kobatake, Kenji Kaneko, Taisuke Sasaki, Tadakatsu Ohkubo, Chikako Takushima, Jun Ichi Hamada

    Scientific Reports   14 ( 1 )   4360   2024.12   ISSN:2045-2322 eISSN:2045-2322

     More details

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

    Combined addition of interstitial-substitutional elements has been acknowledged to contribute to the increase in the strengths of steels. For further improvements in mechanical properties, their atomic-scale interaction mechanisms with dislocations are required to be examined. In this study, both high-resolution transmission electron microscopy and atom-probe tomography were used to correlate interstitial-substitutional elements with dislocation characteristics in austenitic stainless steels. Three types of dislocation core structures are identified and associated with their strain fields as well as N and Cr atoms in the N-added steels. It is revealed that N atoms interact elastically with the dislocations, followed by the segregation of Cr atoms via the chemical interaction between N and Cr atoms. This insight significantly improves the understanding of the multiple alloying mechanism in metallic materials such as interstitial alloys and high-entropy alloys.

    DOI: 10.1038/s41598-024-54852-w

    Web of Science

    Scopus

    PubMed

    researchmap

  • Chirality in Singlet Fission: Controlling Singlet Fission in Aqueous Nanoparticles of Tetracenedicarboxylic Acid Ion Pairs

    Ilias Papadopoulos, Joseph Ka‐Ho Hui, Masa‐aki Morikawa, Yasuhito Kawahara, Kenji Kaneko, Kiyoshi Miyata, Ken Onda, Nobuo Kimizuka

    Advanced Science   e2405864   2024.8   eISSN:2198-3844

     More details

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

    DOI: 10.1002/advs.202405864

    Web of Science

    Scopus

    PubMed

    researchmap

  • Formation of core-shell structured carbides via interphase precipitations in V-Nb microalloyed steels

    Yasuhito Kawahara, Asaka Tokuhisa, Takuya Maeda, Hiroyuki Shirahata, Ryuji Uemori, Kenji Kaneko

    Scripta Materialia   249   2024.8   ISSN:1359-6462 eISSN:1872-8456

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.scriptamat.2024.116169

    Web of Science

    Scopus

    researchmap

  • Influence of Nitrogen Content and Deformation Temperatures on Dislocation Structures in Austenitic Stainless Steels

    Yabuki Soh, Kawahara Yasuhito, Kobatake Shunya, Takushima Chikako, Hamada Jun-ichi, Kaneko Kenji

    Tetsu-to-Hagane   110 ( 10 )   779 - 787   2024.8   ISSN:00211575 eISSN:18832954

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Iron and Steel Institute of Japan  

    <p>Nitrogen-added austenitic stainless steels exhibit excellent work-hardenability due to planar slips of dislocations. Two mechanisms of the planar slip have been proposed so far: glide plane softening mechanism and stacking-fault energy (SFE) reduction mechanism, which are thought to be dependent on nitrogen content and deformation temperature. In this study, conventional TEM, STEM-EDS and HR-STEM characterizations were carried out to clarify the influences of deformation temperature and nitrogen content on the dislocation characteristics of austenitic stainless steels. In the case of the nitrogen-added steel, the dislocation configurations became planar at a high temperature, 973 K. HR-STEM analysis revealed that SFE decreased with N addition and increased with temperature increase. Weak-beam TEM and HR-STEM analyses revealed that the planar dislocations were composed of 60° mixed-dislocations and SFs at room temperature, and edge-dislocation and SFs at 973 K. These results suggested that the edge components of defects interacted elastically with N and N-Cr pairs and contributed to the origin of the planar slips.</p>

    DOI: 10.2355/tetsutohagane.tetsu-2024-054

    Scopus

    CiNii Research

    researchmap

  • Combined effect of interstitial-substitutional elements on dislocation dynamics in nitrogen-added austenitic stainless steels

    Kawahara Yasuhito, Kobatake Shunya, Kaneko Kenji, Sasaki Taisuke, Ohkubo Tadakatsu, Takushima Chikako, Hamada Jun-ichi

    scientific reports   14   4360   2024.2   eISSN:20452322

     More details

    Language:English  

    Combined addition of interstitial-substitutional elements has been acknowledged to contribute to the increase in the strengths of steels. For further improvements in mechanical properties, their atomic-scale interaction mechanisms with dislocations are required to be examined. In this study, both high-resolution transmission electron microscopy and atom-probe tomography were used to correlate interstitial-substitutional elements with dislocation characteristics in austenitic stainless steels. Three types of dislocation core structures are identified and associated with their strain fields as well as N and Cr atoms in the N-added steels. It is revealed that N atoms interact elastically with the dislocations, followed by the segregation of Cr atoms via the chemical interaction between N and Cr atoms. This insight significantly improves the understanding of the multiple alloying mechanism in metallic materials such as interstitial alloys and high-entropy alloys.

    CiNii Research

  • Lessons Through Electron Microscopy Experiment

    Kawahara Yasuhito

    Materia Japan   63 ( 1 )   69 - 69   2024.1   ISSN:13402625 eISSN:18845843

     More details

    Language:Japanese   Publisher:The Japan Institute of Metals and Materials  

    DOI: 10.2320/materia.63.69

    CiNii Research

    researchmap

  • Nucleation and Phase Development of Precipitates in Age-hardenable Aluminium Alloys Studied by 4D-STEM

    Randi Holmestad, Elisabeth Thronsen, Yasuhito Kawahara, Tina Bergh, Jørgen A. Sørhaug, Christoph M. Hell, Ruben Bjørge, Emil F. Christiansen, Kenji Kaneko, Calin D. Marioara

    Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada   29 ( 1 )   305 - 306   2023.7   ISSN:1431-9276 eISSN:1435-8115

     More details

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

    DOI: 10.1093/micmic/ozad067.141

    Scopus

    PubMed

    researchmap

  • Transition from carbon clusters to ε, θ-carbides in a quenched and aged low-carbon ferritic steel

    Yasuhito Kawahara, Kenji Kaneko, Hideaki Sawada, Jun Takahashi

    Acta Materialia   252   2023.6   ISSN:1359-6454 eISSN:1873-2453

     More details

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

    DOI: 10.1016/j.actamat.2023.118919

    Web of Science

    Scopus

    researchmap

  • Characterization of age hardening mechanism of low-temperature aged low-carbon steel by transmission electron microscopy

    Yasuhito Kawahara, Takuya Maeda, Keisuke Kinoshita, Jun Takahashi, Hideaki Sawada, Ryo Teranishi, Kenji Kaneko

    Materials Characterization   183   2022.1   ISSN:1044-5803 eISSN:1873-4189

     More details

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

    Low-temperature aging treatment at 323 K results in the dramatical increase in hardness in low-carbon ferritic steels quenched from 983 K, possibly caused by carbon clusters and/or fine ε-carbides. In this study, transmission electron microscopy (TEM) analysis was carried out to characterize the change of the microstructure during the low-temperature aging treatment. Until the early stage of the peak hardness, the carbon clusters were formed homogeneously with zig-zag structures. At the latter stage of the peak hardness, it was found that the ε-carbides were partially precipitated within the carbon clusters, which suggested that the carbon clusters might have acted as the precursors of ε-carbides. In-situ tensile TEM observations showed that dislocation motions were free-glide type, and carbon clusters and fine-carbides interacted with dislocations via cutting-type. Dislocation interaction force was also evaluated, which suggested that the lattice misfit played as important role of the interaction mechanism.

    DOI: 10.1016/j.matchar.2021.111579

    Web of Science

    Scopus

    researchmap

  • Formation of core-shell type structure in Duplex Martensitic Steel

    Kenji Kaneko, Takuya Maeda, Yasuhito Kawahara, Kazuhiro Ichino, Takuro Masumura, Toshihiro Tsuchiyama, Hiroyuki Shirahata, Ryuji Uemori

    Scripta Materialia   193   112 - 116   2021.3

     More details

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

    DOI: 10.1016/j.scriptamat.2020.10.044

  • Effect of nitrogen addition on the stacking-fault energies in Si-added austenitic stainless steel

    Yasuhito Kawahara, Ryo Teranishi, Chikako Takushima, Jun Ichi Hamada, Kenji Kaneko

    ISIJ International   61 ( 3 )   1029 - 1036   2021.3

     More details

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

    DOI: 10.2355/ISIJINTERNATIONAL.ISIJINT-2020-609

  • Plan-view characterization of intergranular precipitates on grain boundaries by combination of FIB lift out method and TEM analyses: A case study in austenitic stainless steel

    Kousei Sato, Kenji Kaneko, Toru Hara, Yasuhito Kawahara, Jun ichi Hamada, Chikako Takushima, Ryo Teranishi

    Micron   138   2020.11

     More details

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

    DOI: 10.1016/j.micron.2020.102927

  • An answer to the carbon cluster in low-temperature aged ferritic low-carbon steel

    Takuya Maeda, Yasuhito Kawahara, Keisuke Kinoshita, Hideaki Sawada, Jun Takahashi, Ryo Teranishi, Kenji Kaneko

    Materials Characterization   159   2020.1

     More details

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

    DOI: 10.1016/j.matchar.2019.110006

▼display all

Presentations

  • 薄膜プロセスを用いたBa8CuxSi46-x発電材料における組成傾斜領域の微細構造解析

    中島康雄, 河原康仁, 宗藤伸治, 寺西亮

    2024年度日本金属学会, 日本鉄鋼協会, 軽金属学会 九州支部共催  2024.6 

     More details

    Event date: 2024.6

    researchmap

  • V及びNb複合添加鋼におけるコアシェル型合金炭化物の相界面析出現象

    河原 康仁, 徳久 朝佳, 鈴木 良河, 金子 賢治, 植森 龍治, 前田 拓也, 中村 修一

    日本鉄鋼協会第187回春季講演大会  2024.3 

     More details

    Language:Others  

    Country:Other  

  • 2D and 4D high-resolution scanning transmission microscopy of GP-zones in the 6xxx system

    IMC20  2023.9 

     More details

    Language:Others  

    Country:Other  

    2D and 4D high-resolution scanning transmission microscopy of GP-zones in the 6xxx system

  • Al-Mg-Si合金におけるクラスターの原子構造に及ぼすCu添加の影響

    河原康仁, Christoph Martin Hell, Calin Daniel Marioara, Elisabeth Savitri Thrane, Eva Anne Mørtsell, Jostein Røyse, Randi Holmestad, 金子賢治

    日本顕微鏡学会第79回学術講演会  2023.6 

     More details

    Language:Others  

    Country:Other  

  • Atomic-scale study of GP-zones in Al-Mg-Si-Cu alloys by four-dimensional scanning transmission electron microscopy

    IMC20 Satellite Symposium  2023.9 

     More details

    Language:Others  

    Country:Other  

    Atomic-scale study of GP-zones in Al-Mg-Si-Cu alloys by four-dimensional scanning transmission electron microscopy

  • Atomically resolved STEM and 3DAP analysis of the dislocation dragging mechanisms in nitrogen-added Fe-Cr-Ni austenitic stainless steels

    Yasuhito Kawahara, Shunya Kobatake, Chikako Takushima, Jun-ichi Hamada, Taisuke Sasaki, Tadakatsu Ohkubo, Kenji Kaneko

    IMC20  2023.9 

     More details

    Language:Others  

    Country:Other  

    Atomically resolved STEM and 3DAP analysis of the dislocation dragging mechanisms in nitrogen-added Fe-Cr-Ni austenitic stainless steels

  • Dislocation analyses in Nitrogen-added Austenitic Stainless Steels

    Soh Yabuki, Yasuhito Kawahara, Chikako Takushima, Junichi Hamada, Kenji Kaneko

    IMC20 Satellite Symposium  2023.9 

     More details

    Language:Others  

    Country:Other  

    Dislocation analyses in Nitrogen-added Austenitic Stainless Steels

  • Influence of Cu addition on the atomic structure of early-stage precipitates in 6XXX alloys

    INTPART Workshop  2023.4 

     More details

    Language:Others  

    Country:Other  

    Influence of Cu addition on the atomic structure of early-stage precipitates in 6XXX alloys

  • Nucleation and Phase Development of Precipitates in age-hardenable Aluminium Alloys studied by 4DSTEM Invited

    M&M 2023  2023.7 

     More details

    Language:Others  

    Country:Other  

    Nucleation and Phase Development of Precipitates in age-hardenable Aluminium Alloys studied by 4DSTEM

  • オーステナイト系ステンレス鋼におけるN-Crクラスターと転位の相互作用

    河原康仁, 小畠駿哉, 多久島睦子, 濱田純一, 金子賢治

    2023年度日本鉄鋼協会 材料の組織と特性部会 若手金属材料研究者の交流(若手)フォーラム  2023.6 

     More details

    Language:Others  

    Country:Other  

  • Al-Mg-Si合金の析出過程に及ぼすCu添加の影響

    河原康仁, 吉川有太, 金子賢治

    日本顕微鏡学会第78回学術講演会  2022.5 

     More details

    Language:Others  

    Country:Other  

  • Influence of nitrogen addition on the temperature dependences of hardening mechanisms in austenitic stainless steels

    Yasuhito Kawahara, Shunya Kobatake, Chikako Takushima, Jun-ichi Hamada, Kenji Kaneko

    ICAS2022  2022.5 

     More details

    Language:Others  

    Country:Other  

    Influence of nitrogen addition on the temperature dependences of hardening mechanisms in austenitic stainless steels

  • Influences of Cu addition on precipitation hardening mechanisms in Al-Mg-Si alloys

    Yasuhito Kawahara, Yuta Kikkawa, Kenji Kaneko

    ICAA18  2022.9 

     More details

    Language:Others  

    Country:Other  

    Influences of Cu addition on precipitation hardening mechanisms in Al-Mg-Si alloys

  • 鉄鋼材料における炭素クラスターを介した炭化物の析出機構の直接観察

    河原康仁, 高橋淳, 澤田英明, 金子賢治

    九州大学エネルギーウィーク2022  2022.1 

     More details

    Language:Others  

    Country:Other  

  • Al-Mg-Si合金の析出強化に及ぼすCu添加の影響

    河原康仁, 寺西亮, 金子賢治, 宍戸久郎

    日本顕微鏡学会第64回シンポジウム  2021.11 

     More details

    Language:Others  

    Country:Other  

  • その場引張TEM法によるAl-Mg-Si合金の析出強化の定量評価

    河原康仁, 佐藤幸生, 寺西亮, 宍戸久郎, 金子賢治

    日本金属学会第169回講演大会  2021.9 

     More details

    Language:Others  

    Country:Other  

  • その場引張TEM法によるCクラスターと転位の相互作用の解明

    河原康仁, 佐藤幸生, 寺西亮, 金子賢治, 高橋淳, 澤田英明

    日本鉄鋼協会第180回春季講演大会  2021.3 

     More details

    Language:Others  

    Country:Other  

  • その場引張TEM観察によるAl-Mg-Si系合金の析出強化に及ぼすCu添加の影響の解明

    河原康仁, 佐藤幸生, 寺西亮, 宍戸久郎, 金子賢治

    九州大学エネルギーウィーク2021  2021.1 

     More details

    Language:Others  

    Country:Other  

  • 低炭素鋼における炭素クラスターを介した炭化物の析出機構の解明

    河原康仁, 佐藤幸生, 寺西亮, 金子賢治, 高橋淳, 澤田英明

    日本顕微鏡学会第77回学術講演会  2021.6 

     More details

    Language:Others  

    Country:Other  

  • 透過電子顕微鏡法を用いた炭素鋼におけるCクラスターと転位の相互作用の解明

    河原康仁, 佐藤幸生, 寺西亮, 金子賢治, 木下恵介, 高橋淳, 澤田英明

    2020年度資源・素材学会九州支部「若手研究者および技術者の研究発表会」  2021.5 

     More details

    Language:Others  

    Country:Other  

  • 低炭素鋼におけるCクラスターの高分解能TEM観察による原子構造解析

    河原康仁, 佐藤幸生, 寺西亮, 木下恵介, 高橋淳, 澤田英明, 金子賢治

    2020年度資源・素材学会九州支部「若手研究者および技術者の研究発表会」  2020.5 

     More details

    Language:Others  

    Country:Other  

  • 低炭素鋼におけるCクラスターと転位の相互作用の解明

    河原康仁, 佐藤幸生, 寺西亮, 木下恵介, 高橋淳, 澤田英明, 金子賢治

    2020年度日本鉄鋼協会春季大会  2020.3 

     More details

    Language:Others  

    Country:Other  

  • 炭素クラスターと転位の相互作用のその場および静的解析

    河原康仁, 金子賢治, 木下惠介, 澤田英明, 高橋淳

    日本顕微鏡学会第63回シンポジウム「顕微鏡オンラインフォーラム2020」  2020.11 

     More details

    Language:Others  

    Country:Other  

  • SUSXM15J1における積層欠陥の観察

    河原康仁, 佐藤幸生, 寺西亮, 多久島睦子, 松橋透, 金子賢治

    2019年度日本金属学会, 日本鉄鋼協会, 軽金属学会 九州支部共催  2019.6 

     More details

    Language:Others  

    Country:Other  

  • オーステナイト系ステンレス鋼における積層欠陥エネルギーへの窒素添加の影響

    河原康仁, 佐藤幸生, 寺西亮, 多久島睦子, 溝口太一郎, 金子賢治

    2019年度日本顕微鏡学会九州支部会  2019.12 

     More details

    Language:Others  

    Country:Other  

  • 窒素添加オーステナイト系ステンレス鋼における積層欠陥エネルギーの測定

    河原康仁, 佐藤幸生, 寺西亮, 多久島睦子, 松橋透, 金子賢治

    2019年度資源・素材学会九州支部「若手研究者および技術者の研究発表会」  2019.5 

     More details

    Language:Others  

    Country:Other  

  • 鉄鋼材料における炭素クラスターを介した炭化物の析出機構の直接観察

    河原康仁, 高橋淳, 澤田英明, 金子賢治

    九州大学エネルギーウィーク2022  2022.1 

     More details

  • 窒素添加オーステナイト系ステンレス鋼における時効処理が粒内析出物に及ぼす影響

    原子大輝, 河原康仁, 多久島睦子, 濱田純一, 金子賢治

    2024年度日本金属学会, 日本鉄鋼協会, 軽金属学会 九州支部共催  2024.6 

     More details

  • オーステナイト系ステンレス鋼におけるN-Crクラスターと転位の相互作用

    河原康仁, 小畠駿哉, 多久島睦子, 濱田純一, 金子賢治

    2023年度日本鉄鋼協会 材料の組織と特性部会 若手金属材料研究者の交流(若手)フォーラム  2023.6 

     More details

  • V及びNb複合添加鋼におけるコアシェル型合金炭化物の相界面析出現象

    河原 康仁, 徳久 朝佳, 鈴木 良河, 金子 賢治, 植森 龍治, 前田 拓也, 中村 修一

    2024.3 

     More details

  • Nucleation and Phase Development of Precipitates in age-hardenable Aluminium Alloys studied by 4DSTEM Invited

    Randi Holmestad, Elisabeth Thronsen, Yasuhito Kawahara, Tina Bergh, Jørgen A, Sørhaug, Christoph M. Hell, Ruben Bjørge, Kenji Kaneko, Calin Marioara

    M&M 2023  2023.7 

     More details

  • Mg過剰型Al-Mg-Si合⾦における時効硬化に及ぼすCu添加の影響

    田中優大, 河原康仁, 金子賢治

    2024年度日本金属学会, 日本鉄鋼協会, 軽金属学会 九州支部共催  2024.6 

     More details

  • Influences of Cu addition on precipitation hardening mechanisms in Al-Mg-Si alloys

    Yasuhito Kawahara, Yuta Kikkawa, Kenji Kaneko

    ICAA18  2022.9 

     More details

  • Influence of nitrogen addition on the temperature dependences of hardening mechanisms in austenitic stainless steels

    Yasuhito Kawahara, Shunya Kobatake, Chikako Takushima, Jun-ichi Hamada, Kenji Kaneko

    2022.5 

     More details

  • Influence of Cu addition on the atomic structure of early-stage precipitates in 6XXX alloys

    Yasuhito Kawahara, Christoph Martin Hell, Calin Daniel Marioara, Elisabeth Savitri Thrane, Eva Anne Mørtsell, Jostein Røyse, Randi Holmestad, Kenji Kaneko

    INTPART Workshop  2023.4 

     More details

  • Dislocation analyses in Nitrogen-added Austenitic Stainless Steels

    Soh Yabuki, Yasuhito Kawahara, Chikako Takushima, Junichi Hamada, Kenji Kaneko

    IMC20 Satellite Symposium  2023.9 

     More details

  • Atomically resolved STEM and 3DAP analysis of the dislocation dragging mechanisms in nitrogen-added Fe-Cr-Ni austenitic stainless steels

    Yasuhito Kawahara, Shunya Kobatake, Chikako Takushima, Jun-ichi Hamada, Taisuke Sasaki, Tadakatsu Ohkubo, Kenji Kaneko

    IMC20  2023.9 

     More details

  • Atomic-scale study of GP-zones in Al-Mg-Si-Cu alloys by four-dimensional scanning transmission electron microscopy

    Yasuhito Kawahara, Christoph Martin Hell, Calin Daniel Marioara, Elisabeth Savitri Thrane, Eva Anne Mørtsell, Jostein Røyse, Randi Holmestad, Kenji Kaneko

    IMC20 Satellite Symposium  2023.9 

     More details

  • Al-Mg-Si合金の析出過程に及ぼすCu添加の影響

    河原康仁, 吉川有太, 金子賢治

    日本顕微鏡学会第78回学術講演会  2022.5 

     More details

  • Al-Mg-Si合金におけるクラスターの原子構造に及ぼすCu添加の影響

    河原康仁, Christoph Martin Hell, Calin Daniel Marioara, Elisabeth Savitri Thrane, Eva Anne Mørtsell, Jostein Røyse, Randi Holmestad, 金子賢治

    日本顕微鏡学会第79回学術講演会  2023.6 

     More details

  • 2D and 4D high-resolution scanning transmission microscopy of GP-zones in the 6xxx system

    Christoph Martin Hell, Yasuhito Kawahara, Jonas Frafjord, Ruben Bjørge, Kenji Kaneko, Randi Holmestad

    IMC20  2023.9 

     More details

▼display all

MISC

  • 電子顕微鏡での研究を通じて

    河原 康仁

    まてりあ   2024.1

     More details

    Language:Japanese  

    DOI: 10.2320/materia.63.69

  • 国際的な交流を進めるうえでの学び

    河原康仁

    軽金属   2023.4

     More details

    Language:Others  

  • 国際的な交流を進めるうえでの学び

    河原康仁

    軽金属   73 ( 4 )   190 - 190   2023.4

     More details

  • Al-Mg-Si合金の析出強化機構へのCu添加量の影響

    吉川有太, 河原康仁, 佐藤幸生, 金子賢治

    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合同学術講演大会講演概要集   2022   2022

Professional Memberships

  • 日本金属学会

  • 日本鉄鋼協会

  • 日本顕微鏡学会

  • 日本顕微鏡学会

      More details

  • 日本鉄鋼協会

      More details

  • 日本金属学会

      More details

▼display all

Committee Memberships

  • 一般社団法人 日本鉄鋼協会 「材料の組織と特性部会」若手フォーラム   大学委員  

    2024.4 - Present   

      More details

  • 一般社団法人 日本鉄鋼協会 「材料の組織と特性部会」若手フォーラム   博士委員  

    2023.4 - 2024.3   

      More details

    Committee type:Academic society

    researchmap

Research Projects

Class subject

  • 材料工学実験第一

    2024.4 - 2024.6   Spring quarter