Updated on 2024/10/04

Information

 

写真a

 
FUJIHARA HIRO
 
Organization
Faculty of Engineering Department of Mechanical Engineering Assistant Professor
School of Engineering (Concurrent)
Graduate School of Engineering Department of Mechanical Engineering(Concurrent)
Title
Assistant Professor
Contact information
メールアドレス
Tel
0928023215
External link

Research Areas

  • Nanotechnology/Materials / Structural materials and functional materials

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Mechanics of materials and materials

Degree

  • Dr. Eng.

Research History

  • Kyushu University Faculty of Engineering Assistant Professor

    2021.10 - Present

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    Country:Japan

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Education

  • Kyushu University   School of Engineering   Department of Mechanical Engineering

    2016.3

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    Country: Japan

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  • Kyushu University   Faculty of Engineering   Department of Mechanical Engineering

    2021.9

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    Country: Japan

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  • Kyushu University   Faculty of Engineering   Department of Mechanical Engineering

    2018.3

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    Country: Japan

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Research Interests・Research Keywords

  • Research theme:水素脆化

    Keyword:水素脆化

    Research period: 2024

  • Research theme:放射光X線イメージング

    Keyword:放射光X線イメージング

    Research period: 2024

  • Research theme:アルミニウム合金

    Keyword:アルミニウム合金

    Research period: 2024

Awards

  • 令和5年度軽金属論文賞

    2023.11   Suppression of Hydrogen Embrittlement due to Local Partitioning of Hydrogen to Dispersed Intermetallic Compound Particles in Al–Zn–Mg–Cu Alloys

    Hiro Fujihara, Kazuyuki Shimizu, Hiroyuki Toda, Akihisa Takeuchi, Masayuki Uesugi

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  • 第74回金属組織写真賞 優秀賞

    2024.3   日本金属学会   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

  • 令和5年度日刊工業新聞社賞

    2023.11   日刊工業新聞   Suppression of Hydrogen Embrittlement due to Local Partitioning of Hydrogen to Dispersed Intermetallic Compound Particles in Al–Zn–Mg–Cu Alloys

  • 令和5年度軽金属論文新人賞

    2023.11   Suppression of Hydrogen Embrittlement due to Local Partitioning of Hydrogen to Dispersed Intermetallic Compound Particles in Al–Zn–Mg–Cu Alloys

    Hiro Fujihara

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  • 優秀講演表彰

    2023.9   日本機械学会材料力学部門   マルチモーダル3Dイメージベース解析を用いたAl-Zn-Mg合金における水素脆化挙動評価

  • 優秀学生講演賞

    2021.5  

  • 口頭発表優秀賞

    2019.6  

  • 平成29年度軽金属学会希望の星賞

    2018.3  

  • Excellent Poster Award for Young Scientist

    2016.8  

  • 口頭発表優秀賞

    2016.6  

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Papers

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

    Hiro Fujihara, Hiroyuki Toda, Ken-ichi Ebihara, Masakazu Kobayashi, Tsuyoshi Mayama, Kyosuke Hirayama, Kazuyuki Shimizu, Akihisa Takeuchi, Masayuki Uesugi

    International Journal of Plasticity   174   103897 - 103897   2024.3   ISSN:0749-6419 eISSN:1879-2154

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    Hydrogen can strongly embrittle aluminum alloys by accumulating at precipitate interface and triggering transgranular cracking, due to stress-driven hydrogen diffusion towards crack tip and grain boundaries. However, although mechanical features near crack tip and grain boundaries, and hydrogen diffusion/trapping processes have been extensively studied separately, very few quantitative information regarding the local interactions between hydrogen distribution and stress fields with full spatial complexity has been revealed. The present study attempts to fill this gap, by using a multi-modal three-dimensional image-based simulation that combines a crystal plasticity finite element method with hydrogen diffusion analysis, to fully capture the actual stress distribution and its effect on hydrogen distribution, and more importantly on cracking probability, near a real propagating hydrogen-induced crack. Stress-diffusion-trapping coupled simulations indicate the intergranular crack transitioned to a quasi-cleavage crack in the region where the interfacial cohesive energy of semi-coherent interface of the MgZn2 precipitate was reduced by hydrogen accumulation near the crack tip. The multi-modal three-dimensional image-based simulation used in the present study successfully bridged nanoscopic debonding and macroscopic hydrogen embrittlement fracture behavior.

    DOI: 10.1016/j.ijplas.2024.103897

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  • Role of retrogression and reaging in suppressing hydrogen-induced transgranular cracking in 7xxx Al alloys

    Yafei Wang, Hiroyuki Toda, Hiro Fujihara, Kazuyuki Shimizu, Kyosuke Hirayama, Akihisa Takeuchi, Masayuki Uesugi

    Scripta Materialia   255   116383   2025.1

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  • Surrogate model-based assessment of particle damage behaviour of Alsingle bondZnsingle bondMg alloy Reviewed

    Hiroyuki Toda, Yuki Fukuda, Han Li, Kyosuke Hirayama, Hiro Fujihara, Kazuyuki Shimizu, Yafei Wang, Jianwei Tang, Akihisa Takeuchi, Masayuki Uesugi

    Acta Materialia   281   120391   2024.12

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  • Multimodal assessment of mechanically induced transformation and damage in TRIP steels using X-ray nanotomography and pencil-beam diffraction tomography

    Hiroyuki Toda, Chiharu Koga, Kyosuke Hirayama, Akihisa Takeuchi, Masayuki Uesugi, Hiro Fujihara

    Acta Materialia   281   120412   2024.12

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  • Advancing the hydrogen tolerance of ultrastrong aluminum alloys via nanoprecipitate modification

    Yafei Wang, Jianwei Tang, Hiro Fujihara, Nozomu Adachi, Yoshikazu Todaka, Yuantao Xu, Mainak Saha, Taisuke Sasaki, Kazuyuki Shimizu, Kyosuke Hirayama, Akihisa Takeuchi, Masayuki Uesugi, Hiroyuki Toda

    Corrosion Science   240   112471   2024.11

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  • Multi-Modal 3D Image-Based Simulation of Hydrogen Embrittlement Crack Initiation in Al-Zn-Mg Alloy International journal

    Higa Ryota, Fujihara Hiro, Toda Hiroyuki, Kobayashi Masakazu, Ebihara Kenichi, Takeuchi Akihisa

    MATERIALS TRANSACTIONS   65 ( 8 )   899 - 906   2024.8   ISSN:13459678 eISSN:13475320

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Japan Institute of Metals and Materials  

    <p>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 <i>in-situ</i> 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.</p><p> </p><p>This Paper was Originally Published in Japanese in J. JILM <b>73</b> (2023) 530–536. Abstract was slightly modified.</p>

    DOI: 10.2320/matertrans.mt-l2024007

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  • Hydrogen Induced Debonding of Mg<sub>2</sub>Si Particle/Aluminum Interface in Al-Mg-Si Alloy International journal

    Toda Hiroyuki, Fujihara Hiro, Hirayama Kyosuke, Shimizu Kazuyuki, Wang Yafei, Bhupendra Sharma, Tang Jianwei, Takeuchi Akihisa, Uesugi Masayuki

    MATERIALS TRANSACTIONS   65 ( 7 )   763 - 772   2024.7   ISSN:13459678 eISSN:13475320

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Japan Institute of Metals and Materials  

    <p>Recent research has shown that some intermetallic compound particles with high interfacial hydrogen trap energies (e.g., Mg<sub>2</sub>Si) are prone to damage at high hydrogen concentrations. In this study, the acceleration of particle damage in an A6061 alloy was observed <i>in-situ</i> 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 Mg<sub>2</sub>Si 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 Mg<sub>2</sub>Si 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 Mg<sub>2</sub>Si particle/aluminum matrix interface. According to the analysis, reduction of the diameter and simplification of the shape of Mg<sub>2</sub>Si particles are effective method for suppressing such hydrogen-induced debonding.</p>

    DOI: 10.2320/matertrans.mt-m2024026

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

    Hiroyuki Toda, Kyosuke Hirayama, Han Li, Rafael Batres, Seo Dowon, Hiro Fujihara

    Computational Materials Science   243   113115 - 113115   2024.7   ISSN:0927-0256 eISSN:1879-0801

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    DOI: 10.1016/j.commatsci.2024.113115

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

    Hideki Tsuruta, Hiroyuki Toda, Kyosuke Hirayama, Kazuyuki Shimizu, Hiro Fujihara, Akihisa Takeuchi, Masayuki Uesugi

    Materials Science and Engineering: A   902   146607 - 146607   2024.6   ISSN:09215093

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    DOI: 10.1016/j.msea.2024.146607

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  • Numerical verification for the effect of suppressing hydrogen embrittlement by Sn doping in the Al–Zn–Mg alloy

    Ken-ichi Ebihara, Hiro Fujihara, Kazuyuki Shimizu, Masatake Yamaguchi, Hiroyuki Toda

    International Journal of Hydrogen Energy   2024.5   ISSN:0360-3199

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    DOI: 10.1016/j.ijhydene.2024.05.146

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  • Dominant Factors Controlling the Initiation of Hydrogen Embrittlement in Al-Zn-Mg Alloy International journal

    Toda Hiroyuki, Hirayama Kyosuke, Yamaguchi Shogo, Fujihara Hiro, Higa Ryota, Shimizu Kazuyuki, Takeuchi Akihisa, Uesugi Masayuki

    Journal of the Japan Institute of Metals and Materials   88 ( 3 )   39 - 47   2024.3   ISSN:00214876 eISSN:18806880

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

    <p>The surrogate-based microstructural optimization was applied to describe the relationship between local crystallographic microstructure and intergranular hydrogen embrittlement in an Al-Zn-Mg alloy. The support vector machine with an infill sampling criterion was used to realise high-accuracy optimisation with a limited size of data set. The methodology integrates thoroughgoing microstructural quantification, a couple of coarsening processes and the surrogate modelling. An objective function was defined together with 66 design parameters, which quantitatively express the size, shape, orientation and damage during specimen machining for surface grain boundaries and grains. The number of design parameters was then reduced from 66 to 3 during the two-step coarsening process. It has been clarified that intergranular crack initiation is described using the simple size of grains and grain boundaries together with grain boundary orientation with respect to the loading direction. It can be inferred that those design parameters are of crucial importance for crack initiation through the elevation in stress normal to grain boundaries. Correlation between the selected design parameters and crack initiation was rather weak compared to the past application of a similar technique to particle damage. The reason for this was discussed. The present approach offers a cost-efficient solution for the prevention of hydrogen embrittlement through 3D design of crystallographic microstructure, which cannot be obtained with the conventional approaches for developing materials.</p><p> </p><p>Mater. Trans. <b>64</b> (2023) 2729-2738に掲載</p>

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

    Jianwei Tang, Yafei Wang, Hiro Fujihara, Kazuyuki Shimizu, Kyosuke Hirayama, Kenichi Ebihara, Akihisa Takeuchi, Masayuki Uesugi, Hiroyuki Toda

    Scripta Materialia   239   2024.1   ISSN:1359-6462 eISSN:1872-8456

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    Stress corrosion cracking (SCC) behaviors induced by the combination of external and internal hydrogen (H) in an Al-Zn-Mg-Cu alloy were systematically investigated via in-situ 3D characterization techniques. SCC of the Al-Zn-Mg-Cu alloy could initiate and propagate in the potential crack region where the H concentration exceeded a critical value, in which the nanoscopic H-induced decohesion of η-MgZn2 precipitates resulted in macroscopic cracking. External H that penetrated the alloy from the environment played a crucial role during the SCC of the Al-Zn-Mg-Cu alloy by generating gradient-distributed H-affected zones near the crack tips, which made Al alloys in water environment more sensitive to SCC. Additionally, the pre-existing internal H was driven toward the crack tips during plastic deformation. It was involved in the SCC and made contributions to both the cracks initiation and propagation.

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  • Growth Behavior of Pores and Hydrogen Desorption Behavior in Pure Aluminum and A6061 Aluminum Alloys Reviewed

    Shono Yaegashi, Kazuyuki Shimizu, Yasuhiro Kamada, Hiroyuki Toda, Hiro Fujihara, Masayuki Uesugi, Akihisa Takeuchi

    MATERIALS TRANSACTIONS   65 ( 1 )   85 - 92   2024.1   ISSN:1345-9678 eISSN:1347-5320

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    DOI: 10.2320/matertrans.mt-l2023017

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  • Dominant Factors Controlling the Initiation of Hydrogen Embrittlement in Al-Zn-Mg Alloy Reviewed International journal

    Hiroyuki Toda, Kyosuke Hirayama, Shogo Yamaguchi, Hiro, Fujihara, Ryota Higa, Kazuyuki Shimizu, Akihisa Takeuchi, Masayuki Uesugi

    MATERIALS TRANSACTIONS   64 ( 12 )   2729 - 2738   2023.12   ISSN:13459678 eISSN:13475320

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    Dominant Factors Controlling the Initiation of Hydrogen Embrittlement in Al-Zn-Mg Alloy

    DOI: 10.2320/matertrans.MT-M2023116

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

    Higa Ryota, Fujihara Hiro, Toda Hiroyuki, Kobayashi Masakazu, Ebihara Kenichi, Takeuchi Akihisa

    Journal of Japan Institute of Light Metals   73 ( 11 )   530 - 536   2023.11   ISSN:04515994 eISSN:18808018

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    Language:Japanese   Publisher:The Japan Institute of Light Metals  

    <p>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.</p>

    DOI: 10.2464/jilm.73.530

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

    Hiroyuki Toda, Han Li, Rafael Batres, Kyosuke Hirayama, Hiro Fujihara

    Acta Materialia   257   119188 - 119188   2023.9   ISSN:1359-6454 eISSN:1873-2453

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    DOI: 10.1016/j.actamat.2023.119188

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  • Growth behavior of pores and hydrogen desorption behavior in pure aluminum and A6061 aluminum alloys

    Yaegashi Shono, Shimizu Kazuyuki, Kamada Yasuhiro, Toda Hiroyuki, Fujihara Hiro, Uesugi Masayuki, Takeuchi Akihisa

    Journal of Japan Institute of Light Metals   73 ( 5 )   212 - 217   2023.5   ISSN:04515994 eISSN:18808018

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    Growth behavior of pores and hydrogen desorption behavior in pure aluminum and A6061 aluminum alloys

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

    Kazuyuki Shimizu, H Toda, Hiro Fujihara, Masatake Yamaguchi, Masayuki Uesugi, Akihisa Takeuchi, Masahiko Nishijima, Yasuhiro Kamada

    CORROSION   79 ( 8 )   818 - 830   2023.4   ISSN:0010-9312 eISSN:1938-159X

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Association for Materials Protection and Performance ({AMPP})  

    <jats:p>7xxx aluminum alloys are representative high-strength aluminum alloys; however, mechanical property degradation due to hydrogen hinders further strengthening. We have previously reported that hydrogen embrittlement in 7xxx alloys originates from trapped hydrogen at the MgZn2 precipitate interface, providing high hydrogen trapping energy. We propose the dispersion of Mn-based second-phase particles as a novel technique for preventing 7xxx aluminum alloy hydrogen embrittlement. In this study, the deformation and fracture behaviors of high hydrogen 7xxx alloys containing 0.0% Mn and 0.6% Mn are observed in situ using synchrotron radiation X-ray tomography. Although no significant differences appear between the two alloys regarding the initiation of quasicleavage cracks, the area fractions of final quasicleavage fractures are 16.5% and 1.0% for 0.0%Mn and 0.6%Mn alloys, respectively; this finding indicates that the Mn addition reduces hydrogen-induced fractures. The obtained macroscopic hydrogen embrittlement is quantitatively analyzed based on hydrogen partitioning in alloys. Adding 0.6% Mn, generating second-phase particles with high hydrogen trapping abilities, significantly suppresses hydrogen-induced quasicleavage fracture. The results of an original hydrogen partitioning analysis show that the dispersion of Mn-based particles (Al12Mn3Si) with high hydrogen trapping abilities reduces the hydrogen concentration at the semicoherent MgZn2 interface and suppresses hydrogen embrittlement.</jats:p>

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

    Valary Tubei, Hiroyuki Toda, Worapol Ketanond, Hiro Fujihara, Osamu Takakuwa, Akihisa Takeuchi, Masayuki Uesugi

    International Journal of Fatigue   168   107428 - 107428   2023.3   ISSN:0142-1123 eISSN:1879-3452

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    DOI: 10.1016/j.ijfatigue.2022.107428

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

    Yafei Wang, Bhupendra Sharma, Yuantao Xu, Kazuyuki Shimizu, Hiro Fujihara, Kyosuke Hirayama, Akihisa Takeuchi, Masayuki Uesugi, Guangxu Cheng, Hiroyuki Toda

    Nature Communications   13 ( 1 )   6860   2022.11   eISSN:20411723

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    Hydrogen drastically embrittles high-strength aluminum alloys, which impedes efforts to develop ultrastrong components in the aerospace and transportation industries. Understanding and utilizing the interaction of hydrogen with core strengthening elements in aluminum alloys, particularly nanoprecipitates, are critical to break this bottleneck. Herein, we show that hydrogen embrittlement of aluminum alloys can be largely suppressed by switching nanoprecipitates from the η phase to the T phase without changing the overall chemical composition. The T phase strongly traps hydrogen and resists hydrogen-assisted crack growth, with a more than 60% reduction in the areal fractions of cracks. The T phase-induced reduction in the concentration of hydrogen at defects and interfaces, which facilitates crack growth, primarily contributes to the suppressed hydrogen embrittlement. Transforming precipitates into strong hydrogen traps is proven to be a potential mitigation strategy for hydrogen embrittlement in aluminum alloys.

    DOI: 10.1038/s41467-022-34628-4

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  • Suppression of Hydrogen Embrittlement due to Local Partitioning of Hydrogen to Dispersed Intermetallic Compound Particles in Al–Zn–Mg–Cu Alloys Reviewed

    Hiro Fujihara, Kazuyuki Shimizu, Hiroyuki Toda, Akihisa Takeuchi, Masayuki Uesugi

    MATERIALS TRANSACTIONS   63 ( 10 )   1406 - 1415   2022.10   ISSN:13459678 eISSN:13475320

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    <p>Recent studies have revealed that hydrogen embrittlement in Al–Zn–Mg alloys appears to be dominated by hydrogen partitioning to MgZn<sub>2</sub> precipitates. A method has recently been proposed for reducing the hydrogen concentration at MgZn<sub>2</sub> precipitates by adding specific intermetallic compound particles that have high hydrogen trap energy. In the present study, the effectiveness of Al<sub>7</sub>Cu<sub>2</sub>Fe particles on suppression of hydrogen embrittlement in Al–Zn–Mg–Cu alloys was evaluated using X-ray microtomography. Quasi-cleavage cracks were found to be initiated in regions where local volume fractions of the Al<sub>7</sub>Cu<sub>2</sub>Fe particles were relatively low. Hydrogen partitioning to the MgZn<sub>2</sub> precipitate interface was suppressed, even in high hydrogen concentration material, by adding Al<sub>7</sub>Cu<sub>2</sub>Fe particles. However, the fractional area of the quasi-cleavage fracture in the material with high hydrogen concentration was higher due to insufficient hydrogen diffusion inside the Al<sub>7</sub>Cu<sub>2</sub>Fe particles and at the interface between the aluminum matrix and the particles. It appears that finely distributed small Al<sub>7</sub>Cu<sub>2</sub>Fe particles might effectively suppress hydrogen embrittlement.</p>

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  • Influence of Hydrogen on the Damage Behavior of IMC Particles in Al–Zn–Mg–Cu Alloys Reviewed

    Ryoichi Oikawa, Kazuyuki Shimizu, Yasuhiro Kamada, Hiroyuki Toda, Hiro Fujihara, Masayuki Uesugi, Akihisa Takeuchi

    MATERIALS TRANSACTIONS   63 ( 12 )   1607 - 1616   2022.10   ISSN:1345-9678 eISSN:1347-5320

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

    DOI: 10.2320/matertrans.mt-l2022020

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

    Yuantao Xu, Hiroyuki Toda, Kazuyuki Shimizu, Yafei Wang, Baptiste Gault, Wei Li, Kyosuke Hirayama, Hiro Fujihara, Xuejun Jin, Akihisa Takeuchi, Masayuki Uesugi

    Acta Materialia   236   118110 - 118110   2022.9   ISSN:1359-6454 eISSN:1873-2453

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    The pursuit of strong and ductile Al alloys with superior resistance to hydrogen embrittlement (HE) is practically significant across the aerospace and transportation industries among others. Unfortunately, effective ways to progress on the strength-HE trade-off for Al-alloys remain elusive. A strategy of suppressing HE by introducing intermetallic compound (IMC) particles to achieve hydrogen redistribution in various trapping sites was proposed. Here, we systematically induce the precipitation of a constant volume fraction of intermetallic compound (IMC) particles by adding one of 14 elements in a ternary Al-Zn-Mg high-strength alloy. We show a strong correlation between hydrogen trapping energies of the IMC obtained from ab initio calculations with the resistance to HE. Mn-rich Al11Mn3Zn2 particles exhibit the highest hydrogen trapping energy (0.859 eV/atom), leading to a decrease by approximately 5 orders of magnitude in the hydrogen occupancy in eta(2) (MgZn2) phase interfaces and grain boundaries, where HE cracks initiate. The Mn-addition did not deteriorate the ductility and most Al11Mn3Zn2 particles remained intact during plastic deformation which was revealed by in-situ 3D X-ray tomography. Hydrogen-induced strain localization at eta(2) phase interfaces and grain boundaries were inhibited due to strong hydrogen trapping capacity of Al11Mn3Zn2, hence preventing HE cracks initiation. Our approach effectively suppresses hydrogen-induced cracks without sacrificing the ductility, and our strategy can help the design roadmap of HE-tolerant high-strength metallic alloys. (C) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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

    Hiroyuki Toda, Kyosuke Hirayama, Kai Okamura, Takafumi Suzuki, Akihisa Takeuchi, Masayuki Uesugi, Hiro Fujihara

    Acta Materialia   234   117956 - 117956   2022.8   ISSN:13596454 eISSN:18732453

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    A combination of X-ray nano-tomography and pencil-beam diffraction tomography was utilized for multimodal assessment of the mechanically induced transformation of individual retained austenite grains during tensile deformation in a 0.1C-5Mn-1Si multi-phase steel. In the present study, a newly developed high energy (20 - 30 keV) and high resolution (spatial resolution of 0.16 µm in this study) X-ray nano-tomography technique was applied for the first time to the in-situ observation of a steel under external loading. The gradual transformation, plastic deformation, and rotation behaviour of the individual austenite grains were clearly observed in 3D. It was revealed that the early stage of the transformation was dominated by the stress-assisted transformation that can be associated with measured mechanical driving force, whilst the overall transformation was dominated by the strain-induced transformation that is interrelated with measured dislocation multiplication. The transformation behaviour of individual grains was classified according to their initial crystallographic orientation and size. Noteworthy was the high stability of coarse austenite grains (i.e., 2.5 μm or larger in diameter), contrary to past reports in the literature. Characteristic rotation behaviour and wide data dispersion were also observed in the case of the individual austenite grains. It was conclusively demonstrated that such characteristic behaviour partly originated from interactions with surrounding soft and hard phases. The origins of these characteristics are discussed by combining the image-based and diffraction-based information.

    DOI: 10.1016/j.actamat.2022.117956

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

    Oikawa Ryoichi, Shimizu Kazuyuki, Kamada Yasuhiro, Toda Hiroyuki, Fujihara Hiro, Uesugi Masayuki, Takeuchi Akihisa

    Journal of Japan Institute of Light Metals   72 ( 7 )   411 - 419   2022.7   ISSN:04515994 eISSN:18808018

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    Influence of hydrogen on the damage behavior of IMC particles in Al-Zn-Mg-Cu alloys

    DOI: 10.2464/jilm.72.411

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

    Yafei Wang, Hiroyuki Toda, Yuantao Xu, Kazuyuki Shimizu, Kyosuke Hirayama, Hiro Fujihara, Akihisa Takeuchi, Masayuki Uesugi

    Acta Materialia   227   117658 - 117658   2022.4   ISSN:13596454 eISSN:18732453

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    We directly captured, classified, and evaluated 3D particle debonding and fracture behavior in a H-charged 7075 Al alloy throughout the entire tensile deformation using synchrotron X-ray tomography and microstructural feature tracking techniques. The effects of particle size, shape, spatial clustering and stress state on strain-dependent particle damage were identified and isolated from each other. Moreover, state-of-the-art imaging and tracking techniques enabled the establishment of spatially and time-resolved hydrogen distributions during deformation. Based on realistic hydrogen partitioning among various nanoscopic trap sites, the contributions of particles to hydrogen trapping and the hydrogen effect at individual damaged particles were assessed quantitatively. Fracturing of coarse and irregular Al7Cu2Fe particles was found to be the predominant particle damage mode due to the spatial clustering and brittleness of these particles, but a hydrogen effect was not observed. The debonding of Mg2Si particles seemed to be the result of competition between hydrogen and clustering-induced stress localization, but detrimental effects of hydrogen on ductile fracture induced by accelerating interfacial debonding were found to be limited. The quantitative evaluation of particle damage in the present model material clarified a viable strategy for mitigating hydrogen embrittlement, which involves introducing and modifying intermetallic particles with strong hydrogen trapping capacities.

    DOI: 10.1016/j.actamat.2022.117658

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  • Assessment of Hydrogen Accumulation Behavior in Al-Zn-Mg Alloy under Strain with Kelvin Force Microscopy Reviewed International journal

    Fujihara, Hiro, Toda, Hiroyuki, Arita, Makoto, Shimizu, Kazuyuki, Takeuchi, Akihisa, Uesugi, Kentaro

    MATERIALS TRANSACTIONS   62 ( 5 )   636 - 641   2021.5

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    DOI: 10.2320/matertrans.L-M2020873

  • 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

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

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

    Materialia   11   2020.6

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    DOI: 10.1016/j.mtla.2020.100667

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

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

    ENGINEERING FRACTURE MECHANICS   216   2019.7

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    DOI: 10.1016/j.engfracmech.2019.106503

  • Al-8%Zn-1%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 巻 ( 3 号 )   186 - 193   2019.3

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    DOI: 10.2464/jilm.69.186

  • Assessment of hydrogen accumulation behavior in stressed Al-Zn-Mg aluminum alloys by means of Kelvin force microscopy Reviewed

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

    The 16th International Conference on Aluminum Alloys (ICAA16)   2018.6

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  • Hydrogen trapping behavior in Al-Zn-Mg alloys International journal

    Fujihara, Hiro; Toda, Hiroyuki; Shimizu, Kazuyuki; Takeuchi, Akihisa; Uesugi, Kentaro

    The 9th Pacific Rim International Conference on Advanced Materials and Processing (PRICM9)   2016.8

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Presentations

  • 3D analysis of hydrogen embrittlement mechanism in Aluminium alloy by 3D-TEM observation International conference

    Kyosuke Hirayama, Miharu Doi, Hiroyuki Toda, Hiro Fujihara, Kazuyuki Shimizu

    The 19th International Conference on Aluminium Alloys (ICAA19)  2024.6 

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  • Stress corrosion cracking of high strength Al-Zn-Mg-Cu alloy with Mn-rich dispersoid and T phase International conference

    Jianwei Tang, Yafei Wang, Hiro Fujihara, Kazuyuki Shimizu, Kyosuke Hirayama, Hiroyuki Toda

    The 19th International Conference on Aluminium Alloys (ICAA19)  2024.6 

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  • Influence of internal and external hydrogen on stress corrosion cracking behavior in Al-Zn-Mg alloy International conference

    Hiro Fujihara, Hiroyuki Toda, Ken-ich Ebihara, Daiki Shiozawa, Masayuki Uesugi, Akihisa Takeuchi

    The 19th International Conference on Aluminium Alloys (ICAA19)  2024.6 

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  • Hydrogen-tolerant ultra-high-strength aluminum alloy International conference

    Yafei Wang, Hiroyuki Toda, Jianwei Tang, Hiro Fujihara, Nozomu Adachi, Yoshikazu Todaka

    The 19th International Conference on Aluminium Alloys (ICAA19)  2024.6 

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  • Assessment of propagation behavior of intergranular cracks in 7XXX alloy by combining crystal plasticity finite element method and hydrogen diffusion analysis International conference

    Ryota Higa, Hiro Fujihara, Hiroyuki Toda, Ken-ich Ebihara, Masayuki Uesugi, Akihisa Takeuchi

    The 19th International Conference on Aluminium Alloys (ICAA19)  2024.6 

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  • 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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  • 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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    Language:Japanese   Presentation type:Oral presentation (keynote)  

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  • 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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  • 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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  • 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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  • 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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  • 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回春季講演大会  2024.3 

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  • Surrogate-based Optimization for Fatigue Crack Initiation Behavior in Ti-6Al-4V Alloy

    Feng Shuo, 戸田裕之, 藤原比呂

    日本鉄鋼協会第187回春季講演大会  2024.3 

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  • 3D-TEMによるアルミニウム合金の水素脆化メカニズムの3D解析

    平山 恭介, 土井 実春, 戸田 裕之, 藤原 比呂, 清水 一行

    日本金属学会第174回講演大会  2024.3 

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  • 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, 眞山 剛

    日本金属学会第174回講演大会  2024.3 

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  • 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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  • 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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  • 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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  • Hydrogen embrittlement and its prevention in Al-Zn-Mg alloys

    Hiroyuki Toda, Yafei Wang, Jianwei Tang, Masatake Yamaguchi, Tomohito Tsuru, Kazuyuki Shimizu, Hiro Fujihara, Kyosuke Hirayama, Kenichi Ebihara

    MRM2023/IUMRS-ICA2023  2023.12 

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  • Analysis of hydrogen embrittlement mechanism in Al-Zn-Mg alloy by TEM observation

    Kyosuke Hirayama, Miharu Doi, Hiroyuki Toda, Hiro Fujihara, Kazuyuki Shimizu

    MRM2023/IUMRS-ICA2023  2023.12 

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  • Development of hydrogen-resistant Al-Zn-Mg-Cu alloys by T-phase precipitation and trace element addition

    Kazuyuki Shimizu, Shota Tsuchiya, Hiroyuki Toda, Hiro Fujihara, Masayuki Uesugi, Akihisa Takeuchi, Yasuhiro Kamada

    MRM2023/IUMRS-ICA2023  2023.12 

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  • Stress Corrosion Cracking of High Strength Al-Zn-Mg-Cu Alloy with Mn-rich Dispersoid and T(Al2Mg3Zn3) Phase

    Jianwei Tang, Yafei Wang, Hiro Fujihara, Kyosuke Hirayama, Kazuyuki Shimizu, Hiroyuki Toda

    MRM2023/IUMRS-ICA2023  2023.12 

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  • Influence of internal and external hydrogen accumulation behavior on stress corrosion cracking behavior in Al-Zn-Mg alloy

    Hiro Fujihara, Hiroyuki Toda, Ken-ichi Ebihara, Masayuki Uesugi, Akihisa Takeuchi

    MRM2023/IUMRS-ICA2023  2023.12 

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  • Hydrogen Embrittlement of Ultra-fine-grained Al-Zn-Mg-Cu Alloys Processed by High Pressure Torsion

    Yafei Wang, Nozomu Adachi, Hiro Fujihara, Yoshikazu Todaka, Hiroyuki Toda

    MRM2023/IUMRS-ICA2023  2023.12 

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  • 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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  • 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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  • T相とMn系分散粒子を含む高強度Al-Zn-Mg合金の応力腐食割れ

    Jianwei Tang, Yafei Wang, 藤原比呂, 清水一行, 平山恭介, 竹内晃久, 上椙昌之, 戸田裕之

    軽金属学会第145回秋期大会  2023.11 

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  • 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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  • ナノ組織を有する高強度アルミニウム合金の水素脆化防止

    Yafei Wang, Jianwei Tang, 足立望, 藤原比呂, 戸高義一, 清水一行, 平山恭介, 戸田裕之

    軽金属学会第145回秋期大会  2023.11 

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  • Assessment of hydrogen embrittlement behavior in Al-Zn-Mg alloy via multi-modal 3D imagebased analysis

    Hiro Fujihara, Hiroyuki Toda, Ken-ichi Ebihara, Masakazu Kobayashi, Masayuki Uesugi, Akihisa Takeuchi

    ATEM-iDICs '23  2023.10 

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  • Deformation and fracture behavior of T-Phase precipitated Al-Zn-Mg alloys under Hydrogen influence using synchrotron imaging

    Kazuyuki Shimizu, Shota Tsuchiya, Hiroyuki Toda, Hiro Fujihara, Masayuki Uesugi, Akihisa Takeuchi, Yasuhiro Kamada

    ATEM-iDICs '23  2023.10 

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  • Stress corrosion cracking of high strength Al-Zn-Mg-Cu Alloy with Mn-rich dispersoid and T Phase

    Jianwei Tang, Yafei Wang, Hiro Fujihara, Kyosuke Hirayama, Kazuyuki Shimizu, Hiroyuki Toda

    ATEM-iDICs '23  2023.10 

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  • Multi-modal measurements of 3D crystallographic transformation behaviour in TRIP steel

    Hiroyuki Toda, Chiharu Koga, Hiro Fujihara, Akihisa Takeuchi, Masayuki Uesugi, Kyohei Ishikawa

    ATEM-iDICs '23  2023.10 

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  • Influence of crystal plasticity and hydrogen diffusion under stress on intergranular crack propagation in AlZn-Mg alloy

    Ryota Higa, Hiro Fujihara, Hiroyuki Toda, Kenichi Ebihara, Masakazu Kobayashi

    ATEM-iDICs '23  2023.10 

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  • Hydrogen embrittlement of ultra-finegrained Al-Zn-Mg-Cu alloys processed by high pressure torsion

    Yafei Wang, Jianwei Tang, Hiro Fujihara, Nozomu Adachi, Yoshikazu Todaka, Akihisa Takeuchi, Masayuki Uesugi, Hiroyuki Toda

    ATEM-iDICs '23  2023.10 

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  • 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(JAE, 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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  • 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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  • 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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  • 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(JASRI, 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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  • TRIP鋼の曲げ負荷中における結晶学的因子が損傷破壊挙動に与える影響のマルチモーダル解析

    竹藤剛,藤原比呂,戸田裕之

    日本鉄鋼協会第186回秋季講演大会  2023.9 

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    Language:Japanese   Presentation type:Poster presentation  

    Country:Japan  

  • Assessment of hydrogen embrittlement behavior in Al-Zn-Mg alloys by multimodal 3D image-based simulation

    Hiro Fujihara, Hiroyuki Toda, Kenichi Ebihara, Masakazu Kobayashi

    2023 International Hydrogen Conference  2023.9 

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    Assessment of hydrogen embrittlement behavior in Al-Zn-Mg alloys by multimodal 3D image-based simulation

  • Role of T phase in the hydrogen embrittlement suppression for Al-Zn-MgCu alloys

    Yafei Wang, Bhupendra Sharma, Yuantao Xu, Kazuyuki Shimizu, Hiro Fujihara, Hiroyuki Toda

    2023 International Hydrogen Conference  2023.9 

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    Role of T phase in the hydrogen embrittlement suppression for Al-Zn-MgCu alloys

  • Prevention of hydrogen embrittlement in Al-Zn-Mg alloys by disoression of novel phases

    Kazuyuki Shimizu, Yafei Wang, Hiro Fujihara, Hiroyuki Toda, Masatake Yamaguchi, Masayuki Uesugi, Akihisa Takeuchi

    2023 International Hydrogen Conference  2023.9 

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    Event date: 2023.9

    Language:English   Presentation type:Poster presentation  

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  • マルチモーダル3Dイメージベース解析を用いた Al-Zn-Mg合金における水素脆化挙動評価

    藤原比呂, 戸田裕之, 海老原健一, 小林正和

    日本機械学会 M&M・CMD若手シンポジウム2023  2023.8 

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  • 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, 竹内晃久, 上椙真之

    軽金属学会第144回春季講演大会  2023.5 

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  • 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回春季講演大会  2023.5 

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  • 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回春季講演大会  2023.3 

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  • 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

    日本金属学会第172回春期講演大会  2023.3 

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  • 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

    日本金属学会第172回春期講演大会  2023.3 

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  • Al-Zn-Mg合金の水素脆化防止法

    戸田裕之, 清水一行, 平山恭介, 藤原比呂, Sharma Bhupendra, Yafei Wang

    軽金属学会第143回秋期大会  2022.11 

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  • Al-Zn-Mg-Cu合金の時効析出と水素脆化挙動

    小野竜司, 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143回秋期大会  2022.11 

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  • Al-Zn-Mg合金におけるT相の水素トラップと水素脆化防止

    清水一行, 戸田裕之, 藤原比呂, 平山恭介, 山口正剛

    軽金属学会第143回秋期大会  2022.11 

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  • 破面座標の逆追跡による延性破壊起点特定とその応

    戸田裕之, 藤原比呂, 平山恭介, 清水一行

    第17回フラクトグラフィシンポジウム  2022.10 

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  • X線マルチモーダル計測による針状γを含むTRIP鋼の加工誘起変態挙動評価

    古賀智遥, 戸田裕之, 藤原比呂, 平山恭介, 竹内晃久, 上椙真之

    材料シンポジウム 「若手学生研究発表会」  2022.10 

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    Language:Japanese  

    Country:Other  

  • 7000系アルミニウム合金における水素脆化亀裂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, 平山恭介, 清水一行

    日本金属学会第171回秋季講演大会  2022.9 

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    Event date: 2022.9

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  • マルチモーダル3Dイメージベース解析を用いたAl-Zn-Mg合金における水素脆化亀裂進展挙動評価

    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, 比嘉良太

    日本金属学会第171回秋季講演大会  2022.9 

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  • Effect of high temperature aging on hydrogen embrittlement in 7XXX alloys

    Ryuji Ono, Kazuyuki Shimizu, Yasuhiro Kamada, Hiroyuki Toda, Hiro Fujihara, Akihisa Takeuchi

    The 18th International Conference on Aluminium Alloys (ICAA18)  2022.9 

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  • Hydrogen embrittlement in Al-Zn-Mg alloys: Semi-spontaneous interfacial decohesion of precipitates Invited

    Hiroyuki Toda, Masatake Yamaguchi, Tomohiro Tsuru, Kazuyuki Shimizu, Hiro Fujihara, Kyosuke Hirayama, Kenichi Ebihara, Kenji Matsuda

    The 18th International Conference on Aluminium Alloys (ICAA18)  2022.9 

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    Language:English   Presentation type:Oral presentation (keynote)  

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  • Prevention of hydrogen embrittlement via preferential hydrogen partitioning to particles Invited

    Kazuyuki Shimizu, Hiroyuki Toda, Hiro Fujihara, Kyosuke Hirayama, Masatake Yamaguchi, Akihisa Takeuchi

    The 18th International Conference on Aluminium Alloys (ICAA18)  2022.9 

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

    Ryota Higa, Hiro Fujihara, Hiroyuki Toda, Kenichi Ebihara, Masakazu Kobayashi, Tsuyoshi Mayama

    2022.9 

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  • Influence of hydrogen accumulation behavior under stress on hydrogen embrittlement in Al-Zn-Mg alloy with multi-modal 3D image-based analysis

    Hiro Fujihara, Hiroyuki Toda, Kenichi Ebihara, Masakazu Kobayashi, Akihisa Takeuchi, Masayuki Uesugi

    The 18th International Conference on Aluminium Alloys (ICAA18)  2022.9 

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  • Improved hydrogen embrittlement resistance by switching age-hardening precipitates in high-strength Al alloys

    Yafei Wang, Hiroyuki Toda, Yuantao Xu, Bhupendra Sharma, Kazuyuki Shimizu, Hiro Fujihara, Kyosuke Hirayama, Akihisa Takeuchi, Masayuki Uesugi

    The 18th International Conference on Aluminium Alloys (ICAA18)  2022.9 

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  • Al-Zn-Mg 合金における水素脆化亀裂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, 平山恭介, 清水一行, 海老原健一

    第107回軽金属学会九州支部例会  2022.7 

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  • Al-Zn-Mg合金における水素脆化亀裂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, 平山恭介, 清水一行, 海老原健一

    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  2022.6 

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    Event date: 2022.6

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  • 7075アルミニウム合金の金属間化合物粒子の水素誘起損傷挙動の統計学的解析

    福田祐輝, 藤原比呂, 平山恭介, 戸田裕之, 竹内晃久, 上椙真之

    軽金属学会第142回春季講演大会  2022.5 

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  • Al-Mg-Si合金の金属間化合物粒子の水素誘起損傷挙動の3D/4D解析

    藤原比呂, 田中敦基, 戸田裕之, 平山恭介, 清水一行, 竹内晃久, 上椙真之

    軽金属学会第142回春季講演大会  2022.5 

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  • Hydrogen embrittlement prevention in Al-Zn-Mg by Sn addition

    Bhupendra Sharma, Yafei Wang, Hiro Fujihara, Kazuyuki Simizu, Kyosuke Hirayama, Akihisa Takeuchi, Masayuki Uesugi, Hiroyuki Toda

    2022.5 

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  • Al-Zn-Mg合金における水素脆化亀裂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, 平山恭介, 清水一行, 海老原健一

    軽金属学会第142回春季講演大会  2022.5 

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  • Metamodel analysis of crystallographic initiation behavior of hydrogen embrittlement cracks in Al-Zn-Mg alloy

    2022.5 

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  • Al-Zn-Mg-Cu系合金の水素脆化における高温時効の影響

    小野竜司, 清水一行, 鎌田康寛, 戸田裕之, 藤原比呂, 竹内晃久

    軽金属学会第142回春季講演大会  2022.5 

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  • Al-Mg-Si合金中のブリスターの高温曝露下での成長挙動

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

    軽金属学会第142回春季講演大会  2022.5 

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  • ナノ~マクロを繋ぐトモグラフィー:界面の半自発的剥離

    戸田裕之, 清水一行, 藤原比呂, 平山恭介

    自動車技術会2022年春季大会  2022.5 

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  • 3Dイメージベース解析を用いたAl-Zn-Mg合金の水素脆化挙動評価

    藤原比呂, 戸田裕之, 海老原健一, 小林正和

    日本鉄鋼協会第183回春季講演大会  2022.3 

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    Venue:オンライン   Country:Other  

  • 微量添加元素XによるAl-Zn-Mg-X合金の水素脆化防止

    清水一行, 戸田裕之, 藤原比呂, 平山恭介, 上椙真之, 竹内晃久

    日本鉄鋼協会第183回春季講演大会  2022.3 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン  

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  • Al-Zn-Mg合金における水素脆化亀裂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

    日本機械学会 九州支部 九州学生会第53回学生員卒業研究発表講演会  2022.3 

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    Event date: 2022.3

    Language:Japanese  

    Venue:オンライン   Country:Japan  

  • TRIP鋼におけるオーステナイト粒の変態挙動の4Dマルチモーダル解析

    竹藤剛, 藤原比呂, 戸田裕之

    日本機械学会 九州支部 九州学生会第53回学生員卒業研究発表講演会  2022.3 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

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  • Influence of hydrogen accumulation behavior under stress on hydrogen embrittlement in Al-Zn-Mg alloy International conference

    Hiro Fujihara, Hiroyuki Toda, Kenichi Ebihara, Masakazu Kobayashi, Akihisa Takeuchi, Masayuki Uesugi, Shogo Yasuda

    The Material Research Meeting 2021 (MRM2021)  2021.12 

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    Event date: 2021.12

    Language:English   Presentation type:Oral presentation (general)  

    Country:Other  

  • Al-Zn-Mg合金の動的水素分配と水素脆化挙動

    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

    第20回破壊力学シンポジウム  2021.11 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  • 7000系アルミニウム合金の水素脆化挙動とその防止

    戸田裕之, Yafei Wang, Yuantao Xu, 清水一行, 平山恭介, 藤原比呂, 竹内晃久, 上椙真之

    軽金属学会第141回秋季講演大会  2021.11 

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    Event date: 2021.11

    Language:Japanese  

    Venue:オンライン   Country:Japan  

  • Al-Zn-Mg合金の動的水素分配および水素脆化挙動の評価

    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141回秋季講演大会  2021.11 

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    Event date: 2021.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  • 結晶情報を考慮したAl-4&#37;Cu合金の損傷挙動の統計学的解析

    山口翔吾, 戸田裕之, 平山恭介, 藤原比呂, 小林匠冶, 竹内晃久, 上椙真之

    2021年度九州支部合同学術講演会(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共催)  2021.6 

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    Event date: 2021.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  • 2024アルミニウム合金における損傷挙動と粒子・ポア性状の関係の統計学的解析

    福田祐輝, 戸田裕之, 平山恭介, 藤原比呂, 竹内晃久, 上椙真之

    2021年度九州支部合同学術講演会(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共催)  2021.6 

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    Event date: 2021.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  • 結晶塑性有限要素法と水素拡散解析を組み合わせたAl-Zn-Mg合金の応力下での水素濃化挙動評価

    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, 安田匠吾

    第6回マルチスケール材料力学シンポジウム  2021.5 

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    Event date: 2021.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  • 2024アルミニウム合金における損傷挙動と粒子・ポア性状の関係の統計学的解析

    福田祐輝, 戸田裕之, 平山恭介, 藤原比呂, 竹内晃久, 上椙真之

    軽金属学会第140回春季講演大会  2021.5 

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  • Al-Zn-Mg合金の応力下での水素濃化挙動

    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, 安田匠吾

    軽金属学会第140回春季講演大会  2021.5 

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  • 結晶情報を考慮したAl-4%Cu合金の損傷挙動の統計学的解析

    山口翔吾, 戸田裕之, 平山恭介, 藤原比呂, 竹内晃久, 上椙真之, 小林匠冶

    軽金属学会第140回春季講演大会  2021.5 

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  • ヘテロ構造制御によるアルミニム合金の力学特性向上の試み

    戸田裕之, 山口正剛, 都留智仁, 清水一行, 藤原比呂, 平山恭介, 松田健二

    軽金属学会第139回秋期講演大会  2020.11 

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    Event date: 2020.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  • 結晶塑性有限要素法と水素拡散解析を組み合わせたAl-Zn-Mg合金の局所水素分配挙動

    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139回秋期講演大会  2020.11 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  • Al-Zn-Mg-Cu合金の水素脆化抑制における金属間化合物粒子の役割

    藤原比呂, 戸田裕之, 清水一行, 池見優志, 竹内晃久, 上杉健太朗

    軽金属学会第138回春期講演大会  2020.5 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:香川大学 幸町キャンパス(中止)   Country:Japan  

  • Al-Zn-Mg合金の動的水素分配と水素脆化

    戸田裕之, 清水一行, 藤原比呂, 日高純真, 上杉健太朗, 竹内晃久

    軽金属学会第138回春期講演大会  2020.5 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:香川大学 幸町キャンパス(中止)   Country:Japan  

  • Al-Zn-Mg合金の水素分配挙動と擬へき開破壊

    日高純真, 戸田裕之, 清水一行, 藤原比呂, 上杉健太朗, 竹内晃久

    軽金属学会第137回秋期講演大会  2019.11 

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    Event date: 2019.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京農工大学 小金井キャンパス   Country:Japan  

  • Al-Zn-Mg-Cu合金における水素誘起ナノボイドの発生・成長挙動

    清水一行, 戸田裕之, 平山恭介, 藤原比呂, 門川千宙, 上杉健太朗, 竹内晃久

    軽金属学会第137回秋期講演大会  2019.11 

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    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京農工大学 小金井キャンパス   Country:Japan  

  • Assessment of hydrogen accumulation behavior in Al-Zn-Mg alloys during deformation

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

    EUROMAT 2019  2019.9 

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    Event date: 2019.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Sweden  

  • Influence of hydrogen partitioning on deformation and fracture behavior in Al-Zn-Mg alloys

    Kazuyuki Shimizu, Hiroyuki Toda, Hang Su, Hiro Fujihara, Kentaro Uesugi, Akihisa Takeuchi

    EUROMAT 2019  2019.9 

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    Event date: 2019.9

    Language:English   Presentation type:Poster presentation  

    Country:Sweden  

  • 局所的な3D歪み分布に起因する水素濃化挙動のケルビンフォース顕微鏡による直接可視化 Invited

    藤原比呂, 戸田裕之, 清水一行, 竹内晃久, 上杉健太朗

    第101回軽金属学会九州支部例会  2019.7 

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    Event date: 2019.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州工業大学 戸畑キャンパス   Country:Japan  

  • 局所的な3D歪み分布に起因する水素濃化挙動のケルビンフォース顕微鏡による直接可視化

    藤原比呂, 戸田裕之, 清水一行, 竹内晃久, 上杉健太朗

    令和元年度九州支部学術講演会(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共催)  2019.6 

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    Event date: 2019.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:熊本県民交流館パレア   Country:Japan  

  • Assessment of hydrogen embrittlement via in-situ imaging techniques in high Zn Al-Zn-Mg alloys

    Hiroyuki Toda, Hang Su, Kazuyuki Shimizu, Hiro Fujihara, K. Hirayama, Akihisa Takeuchi, Kentaro Uesugi

    22nd European Conference on Fracture (ECF22)  2018.8 

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    Event date: 2018.8

    Language:English   Presentation type:Oral presentation (general)  

    Country:Other  

  • Assessment of hydrogen accumulation behavior in stressed Al-Zn-Mg aluminum alloys by means of Kelvin force microscopy

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

    The 16th International Conference on Aluminum Alloys (ICAA16)  2018.6 

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    Event date: 2018.6

    Language:English   Presentation type:Oral presentation (general)  

    Country:Canada  

  • 高Zn Al-Zn-Mg合金における水素分配と破壊挙動

    清水一行, 戸田裕之, 藤原比呂, 蘇航, 高紅叶, 上杉健太朗, 竹内晃久

    軽金属学会第134回春期講演大会  2018.5 

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    Event date: 2018.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:熊本大学 黒髪南キャンパス   Country:Japan  

  • KFMを用いたAl-Zn-Mg合金における水素集積挙動の評価

    藤原比呂, 戸田裕之, 清水一行, 竹内晃久, 上杉健太朗

    軽金属学会第134回春期講演大会  2018.5 

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    Event date: 2018.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:熊本大学 黒髪南キャンパス   Country:Japan  

  • Al-Zn-Mg合金における水素集積挙動の評価

    藤原比呂, 戸田裕之, 清水一行, 竹内晃久, 上杉健太朗

    日本鉄鋼協会第175回春季講演大会  2018.3 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:千葉工業大学 新習志野キャンパス   Country:Japan  

  • Al-Zn-Mg合金における変形局在化

    戸田裕之, 清水一行, 高紅叶, 藤原比呂, 上杉健太朗, 竹内晃久

    軽金属学会第132回春期講演大会  2017.5 

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    Event date: 2017.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学 東山キャンパス   Country:Japan  

  • Al-Zn-Mg合金における水素誘起変形局在化

    戸田裕之, 清水一行, 高紅叶, 藤原比呂, 上杉健太朗, 竹内晃久

    日本鉄鋼協会第173回春期講演大会  2017.3 

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    Event date: 2017.3

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:首都大学東京 南大沢キャンパス   Country:Japan  

  • Al-Zn-Mg合金における水素分配と水素脆化

    戸田裕之, 清水一行, 高紅叶, 藤原比呂, 上杉健太朗, 竹内晃久

    日本機械学会M&M2016材料力学カンファレンス  2016.10 

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    Event date: 2016.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:神戸大学 六甲台第二キャンパス   Country:Japan  

  • Al-8.4Zn-1.0Mg合金の水素脆性挙動3D/4D解析

    清水一行, 戸田裕之, 藤原比呂, 上杉健太朗, 竹内晃久

    日本金属学会第159回秋季講演大会  2016.9 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大阪大学 豊中キャンパス   Country:Japan  

  • Hydrogen trapping behavior in Al-Zn-Mg alloys

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

    The 9th Pacific Rim International Conference on Advanced Materials and Processing (PRICM9)  2016.8 

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    Event date: 2016.8

    Language:English   Presentation type:Poster presentation  

    Country:Japan  

  • Al-Zn-Mg系アルミニウム合金中の水素分配挙動と水素脆化 Invited

    藤原比呂, 戸田裕之, 清水一行, 竹内晃久, 上杉健太朗

    第95回軽金属学会九州支部例会  2016.7 

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    Event date: 2016.7

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:㈱神戸製鋼所 長府製造所   Country:Japan  

  • Al-Zn-Mg系アルミニウム合金中の水素分配挙動と水素脆化

    藤原比呂, 戸田裕之, 清水一行, 竹内晃久, 上杉健太朗

    平成28年度九州支部学術講演会(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共催)  2016.6 

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    Event date: 2016.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学 筑紫キャンパス   Country:Japan  

  • Al-Zn-Mg合金における水素トラップ挙動

    藤原比呂, 戸田裕之, 清水一行, 竹内晃久, 上杉健太朗

    軽金属学会第130回春期大会  2016.5 

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    Event date: 2016.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:大阪大学 吹田キャンパス   Country:Japan  

  • 高Zn・Al-Zn-Mg合金における水素脆性挙動の3D/4D解析

    清水一行, 戸田裕之, 佐々木勝郎, 藤原比呂, 上杉健太朗, 竹内晃久

    日本金属学会2016年春期(158回)大会  2016.3 

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    Event date: 2016.3

    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 合金における水素脆性

    清水一行, 戸田裕之, 佐々木勝郎, 藤原比呂, 竹内晃久, 上杉健太朗

    日本機械学会M&M2015材料力学カンファレンス  2015.11 

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    Event date: 2015.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:應義塾大学 矢上キャンパス   Country:Japan  

▼display all

MISC

  • 年間レビュー~組織制御~ Reviewed

    藤原比呂

    軽金属   74 ( 8 )   375 - 377   2024.8

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    Authorship:Lead author, Last author, Corresponding author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

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  • LMコラム~学生時代から現在にかけての歩み~

    藤原比呂

    軽金属   2024.1

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    Language:Japanese  

  • 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

    戸田 裕之, 清水 一行, 藤原 比呂, 平山 恭介

    まてりあ   2023.6

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    Language:Japanese  

    DOI: 10.2320/materia.62.359

  • 水素分配制御によるアルミニウム合金の力学特性最適化

    戸田裕之, 山口正剛, 松田健二, 清水一行, 平山恭介, 蘇航, 藤原比呂, 海老原健一, 板倉充洋, 都留智仁, 西村克彦, 布村紀男, 李昇原, 土屋大樹, 竹内晃久, 上杉健太朗

    鉄と鋼   2019.2

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    Language:Japanese  

    DOI: 10.2355/tetsutohagane.tetsu-2018-083

Professional Memberships

  • The Japan Institute of Metals and Materials

    2022.7 - Present

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  • The Japan Society of Mechanical Engineers

    2021.4 - Present

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  • The Iron and Steel Institute of Japan

    2016.6 - Present

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  • The Japan Institute of Light Metals

    2016.3 - Present

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Committee Memberships

  • 軽金属学会   アルミニウム合金中の水素評価研究部会  

    2024.4 - Present   

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    Committee type:Academic society

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  • 日本鉄鋼協会   材料の組織と特性部会第 若手金属材料研究者の交流フォーラム  

    2023.5 - Present   

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    Committee type:Academic society

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  • 日本金属学会   非鉄金属材料の水素侵入・水素脆化研究グループ  

    2023.3 - Present   

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    Committee type:Academic society

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  • 軽金属学会   アルミニウム中の水素と材料物性研究部会  

    2019.4 - 2024.3   

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    Committee type:Academic society

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  • 軽金属学会   水素と力学特性研究部会  

    2017.1 - 2019.3   

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    Committee type:Academic society

Research Projects

  • Multi-modal 3D image-based analysis of hydrogen embrittlement behavior in Al-Zn-Mg alloy via local hydrogen accumulation

    Grant number:23K13564  2023 - 2024

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Early-Career Scientists

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    Authorship:Principal investigator  Grant type:Scientific research funding

    CiNii Research

  • 高強度アルミニウム合金における局所水素脆化挙動のマルチモーダル3Dイメージベースシミュレーション

    2022

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    Grant type:Donation

  • 高力アルミニウム合金の局所的な水素脆化発生条件の解明

    Grant number:20J11740  2019 - 2021

    科学研究費助成事業  特別研究員

    藤原 比呂

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    Authorship:Principal investigator  Grant type:Competitive funding other than Grants-in-Aid for Scientific Research

    金属中に存在する水素は、材料を脆化させ材料特性に著しい影響を及ぼす。次世代の高強度アルミニウム合金の開発が望まれている中で、高強度化を実現し、実用材料としての信頼性を向上させるためには、この現象を理解することが避けられない。実験と数値解析を組合わせることで、変形中の水素濃度変化の定量評価が可能な手法として確立する。この手法により、脆化の発生点での水素濃度を含む必要不可欠な情報を把握することが可能となる。取得した情報を基に、水素による脆化の発生基準を定量的に解明する研究である。

    CiNii Research

Class subject

  • 機械工学実験第一

    2022.4 - 2024.9   First semester