研究業績
研究業績（2021年度以前の論文、獲得外部資金など）の詳細はresearchmapをご覧ください
研究論文 (2022年度以降)
2025
1. K Hirayama, T Miyabe, J Nakajima, S Lin, H Okuda
Three-dimensional tomographic characterization of nanostructures in aluminum alloy multilayers by small-and wide-angle X-ray scattering
Results in Materials 29, 100870, (2026)
https://doi.org/10.1016/j.rinma.2025.100870
2. H. Okuda, S. Lin, K. Hirayama, K. Mase
Anomalous small-angle scattering analysis of solute clusters in Si-excess Al-Mg-Si alloys aged at 413 K
Japanese Journal of Applied Physics 65, 050904, (2026)
https://doi.org/10.35848/1347-4065/ae48a9
3. H. Okuda, S. Lin, K Hirayama, S Inoue, Y Kawamura, N Ohta
Effect of deformation in dilute Mg-Y-Zn alloys for rapid formation of cluster arranged layers examined by in-situ small-and wide-angle X-ray scattering
Japanese Journal of Applied Physics 65, 030902, (2026)
https://doi.org/10.35848/1347-4065/ae3af1
4 Y Wang, H Toda, H Fujihara, K Shimizu, K Hirayama
Quantitative insights into hydrogen embrittlement in two-step aged 7xxx aluminum alloys
Corrosion Science 260, 113590, (2026)
https://doi.org/10.1016/j.corsci.2025.113590
5 H. Fujihara, H. Toda, T. Takefuji, K. Hirayama, A. Takeuchi, M. Uesugi, K. Ishikawa, T. Yokoyama
Multi-modal image-based analysis of mechanically induced transformation behavior during bending deformation in TRIP steel
ISIJ international 65, 1377-1383, (2025)
https://doi.org/10.2355/isijinternational.ISIJINT-2025-047
6 J. Tang, Y. Wang, H. Fujihara, Y. Xu, K. Shimizu, K. Hirayama, A. Takeuchi, M. Uesugi, L. Chen, H. Toda
Exceptional stress corrosion cracking resistance-strength synergy of Al-Zn-Mg-Cu alloys via tailored nano-sized particles
Materials Research Letters, 13, 567-576, (2025)
https://doi.org/10.1080/21663831.2025.2480165
2024
1. H. Toda, C. Koga, K. Hirayama, A. Takeuchi, M. Uesugi, K. Ishikawa, T. Yokoyama, H. Fujihara
Multimodal assessment of mechanically induced transformation and damage in TRIP steels using X-ray nanotomography and pencil-beam diffraction tomography
Acta Materialia 281, 120412, (2024)
https://doi.org/10.1016/j.actamat.2024.120412
2. K. Hirayama, J. Oishi, H. Okuda, Y. Maegawa, M. Yamasaki, Y. Kawamura, N. Ohta
Analysis of Microstructure Formation Process of MgCoY Amorphous Ribbon by TEM Observation and In-Situ Small Angle Scattering Measurement
Materials Transactions, 65, 1384-1389, (2024)
https://doi.org/10.2320/matertrans.MT-L2024008
3. K. Shimizu, H. Toda, K. Hirayama, H. Fujihara, T. Tsuru, M. Yamaguchi, T. Sasaki, M. Uesugi, A. Takeuchi
Hydrogen embrittlement in Al–Zn–Mg alloys: Semispontaneous decohesion of precipitates
International Journal of Hydrogen Energy, 109, 1421-1436, (2025)
https://doi.org/10.1016/j.ijhydene.2025.02.123
1. H. Toda, K. Hirayama, H. Li, R. Batres, S. Dowon, H. Fujihara
Maximising mechanical properties of aluminium alloys by microstructural optimisation using a coarsened surrogate model
Computational Materials Science 243, 113115, (2024)
https://doi.org/10.1016/j.commatsci.2024.113115
2. O. Takakuwa, T. Iwano, K. Hirayama, H. Toda, A. Takeuchi, M. Uesugi
In situ 3D crystallographic characterization of deformation-induced martensitic transformation in a metastable Fe–Cr–Ni austenitic alloy by X-ray microtomography
Scientific Reports 14, 14445, (2024)
https://doi.org/10.1038/s41598-024-65505-3
3. H. Tsuruta, H. Toda, K. Hirayama, K. Shimizu, H. Fujihara, A. Takeuchi, M. Uesugi
The spatial and temporal characterization of type IV creep fracture in notched specimen of modified 9Cr–1Mo steel
Materials Science and Engineering A 902, 146607, (2024)
https://doi.org/10.1016/j.msea.2024.146607
4. A. Ahmed, K. Uttarasak, T. Tsuchiya, S. Lee, K. Nishimura, N. Nunomura, K. Shimizu, K. Hirayama, H. Toda, M. Yamaguchi, T. Tsuru, S. Ikeno, K. Matsuda
Morphology evolution of β-phase in Al-Mg-Si alloys during aging treatment
Journal of Alloys and Compounds, 988, 174234, (2024)
https://doi.org/10.1016/j.jallcom.2024.174234
5. 戸田裕之，平山恭介，山口翔吾，藤原比呂，比嘉良太，清水一行，竹内晃久，上椙真之
Al-Zn-Mg合金の水素脆化発生の支配因子
日本金属学会誌, 88, 39-47, (2024)
https://doi.org/10.2320/jinstmet.J2023028
6. K. Onaka, K. Hirayama, M. Matsuda
Self-Accommodation and Deformation Microstructure of Martensite in Ti30Ni50Zr20 Alloy
Materials Transactions, 65, 268-273, (2024)
https://doi.org/10.2320/matertrans.MT-M2023200
7. H. Fujihara, H. Toda, K. Ebihara, M. Kobayashi, T. Mayama, K. Hirayama, K. Shimizu, A. Takeuchi, M. Uesugi
Assessment of hydrogen embrittlement behavior in Al-Zn-Mg alloy through multi-modal 3D image-based simulation
International Journal of Plasticity, 174, 103897, (2024)
https://doi.org/10.1016/j.ijplas.2024.103897
8. J. Tang, Y. Wang, H. Fujihara, K. Shimizu, K. Hirayama, K. Ebihara, A. Takeuchi, M. Uesugi, H. Toda
Stress corrosion cracking induced by the combination of external and internal hydrogen in Al-Zn-Mg-Cu alloy
Scripta Materialia 239, 115804, (2024)
https://doi.org/10.1016/j.scriptamat.2023.115804
2023
1. H. Toda, H. Li, R. Batres, K. Hirayama, H. Fujihara
Surrogate-based optimization of microstructural features of structural materials
Acta Materialia 257, 119188, (2023)
https://doi.org/10.1016/j.actamat.2023.119188
2. Y. Maegawa, H. Okuda, T. Shimada, K. Hirayama, M. Yamasaki, Y. Kawamura
Small-angle X-ray scattering analysis on the in-plane cluster distribution during heating amorphous Mg85Y9Cu6 alloys
Japanese Journal of Applied Physics 62, 090903, (2023)
https://doi.org/10.35848/1347-4065/acf4d9
3. 伊藤孝憲，永見裕介，加藤淳，今井英人，竹内晃久，上椙真之，平山恭介，戸田裕之
μ-CT 法を用いた引張試験応力下における炭素繊維強化プラスチック (CFRP) の構造変化の研究
SPring-8/SACLA Research Report 11, 247-253, (2023)
https://doi.org/10.18957/rr.11.4.247
4. T. Tsuchiya, K. Uttarasak, S. Lee, A. Ahmed, Š. Mikmeková, K. Nishimura, N. Nunomura, K. Shimizu, K. Hirayama, H. Toda, M. Yamaguchi, T. Tsuru, J. Nakamura, S. Ikeno, K. Matsuda
Existence of hexagonal tabular β-phase in Al-Mg-Si alloys containing noble metal elements
Materials Today Communications 35, 106198, (2023)
https://doi.org/10.1016/j.mtcomm.2023.106198
5. H. Toda, K. Hirayama, S. Yamaguchi, H. Fujihara, R. Higa, K. Shimizu, A. Takeuchi, M. Uesugi
Dominant Factors Controlling the Initiation of Hydrogen Embrittlement in Al-Zn-Mg Alloy
Materials Transactions 64, 2729-2738, (2023)
https://doi.org/10.2320/matertrans.MT-M2023116
6. I. Ando, K. Kudo, K. Hirayama, Y. Shigeta, K. Shinagawa, A. Takeuchi, M. Uesugi, Y. Ozaki
Quantitative estimation of contribution of pore size and the distance between nearest neighbour pores on high cycle fatigue (HCF) crack initiation in Ti-6Al-4V MIM-sintered materials
International Journal of Fatigue, 171, 107557, (2023)
https://doi.org/10.1016/j.ijfatigue.2023.107557
2022
1. K. Hirayama, Y. Sek, T. Suzuki, K. Shimizu, H. Toda, M. Uesugi, A. Takeuchi and W. Ludwig
Crystallographic analysis of behavior of hydrogen embrittlement behavior in aluminium alloy using diffraction contrast tomography
Materials Transactions, 63, 586-591, (2022)
https://doi.org/10.2320/matertrans.MT-L2021020
2. K. Hirayama, H. Toda, H. Su, K. Okamura, Y. Suzuki, A. Takeuchi, M. Uesugi and K. Shimizu
High-resolution / high-energy X-ray phase-contrast tomography techniques and their application to structural metals
SPring-8/SACLA Research Report, 10, 51-59, (2022)
https://doi.org/10.18957/rr.10.1.51
3. Y. Wang, B. Sharma, Y. Xu, K. Shimizu, H. Fujihara, K. Hirayama, A. Takeuchi, M. Uesugi, G. Cheng, H. Toda
Switching nanoprecipitates to resist hydrogen embrittlement in high-strength aluminum alloys
Nature Communications, 13, 6860, (2022)
https://doi.org/10.1038/s41467-022-34628-4
4. H. Toda, K. Hirayama, K. Okamura, T. Suzuki, A. Takeuchi, M. Uesugi, H. Fujihara
Multimodal assessment of mechanically induced transformation in metastable multi‐phase steel using X‐ray nano‐tomography and pencil‐beam diffraction tomography
Acta Materialia, 234, 117956, (2022)
https://doi.org/10.1016/j.actamat.2022.117956
2022年5月プレスリリース
5. Y. Xu, H. Toda, K. Shimizu, Y. Wang, B. Gault, W. Li, K. Hirayama, H. Fujihara, X. Jin, A. Takeuchi, M. Uesugi
Suppressed hydrogen embrittlement of high-strength Al alloys by Mn-rich intermetallic compound particles
Acta Materialia, 236, 118110, (2022)
https://doi.org/10.1016/j.actamat.2022.118110
6. Y. Wang, H. Toda, Y. Xu, K. Shimizu, K. Hirayama, H. Fujihara, A. Takeuchi, M. Uesugi
In-situ 3D observation of hydrogen-assisted particle damage behavior in 7075 Al alloy by synchrotron X-ray tomography
Acta Materialia, 227, 117658, (2022)
https://doi.org/10.1016/j.actamat.2022.117658
2022年2月プレスリリース