Oka Hiroshi

オカヒロシ | Oka Hiroshi

Affiliation and department：
Job title： Associate Professor

Research field (1)： Metallic materials

Research keywords (6)： Radiation effects , Nuclear materials , Additive manufacturing , High entropy alloy , Transmission Electron Microscopy , Oxide Dispersion Strengthened steel

Research theme for competitive and other funds (2)：

2021 - 2024 ボイドスエリングの大幅低減を目指した高燃焼度炉心材料用ハイエントロピー合金の創製
2012 - 2013 高エネルギー粒子線照射下での損傷組織と強度の相関関係式の構築

Papers (38)：

Haotian Sun, Tian Liu, Hiroshi Oka, Naoyuki Hashimoto, Yu Cao, Rui Luo. Role of aging temperature on thermal stability of Co-free Cr0.8FeMn1.3Ni1.3 high-entropy alloy: Decomposition and embrittlement at intermediate temperatures. Materials Characterization. 2024
Haotian Sun, Tian Liu, Naoyuki Hashimoto, Hiroshi Oka. Effects of vacuum heat treatment on novel Co-free Al0·9Cr0·8FeMn0·8Ni2.0 eutectic high entropy alloy: Microstructure evolution and mechanical properties. Vacuum. 2024. 222. 113038-113038
Haotian Sun, Naoyuki Hashimoto, Hiroshi Oka, Shigehito Isobe, Tian Liu. Unveiling the effect of Ni interlayer on diffusion bonded reduced activation Cr0.8FeMnNi medium entropy alloy/316 stainless steel joint: Interfacial microstructure, diffusion behavior and mechanical properties. Materials Characterization. 2023. 206. 113443-113443
Hirotada Hashimoto, Shigehito Isobe, Naoyuki Hashimoto, Hiroshi Oka. Synthesis of Li-Mg-Al-Ti based lightweight high entropy alloys by mechanical alloying and investigation of conditions for solid solution formation. Journal of Alloys and Metallurgical Systems. 2023
Haotian Sun, Zairan Luo, Shuai Wang, Naoyuki Hashimoto, Hiroshi Oka, Qian Liu, Shigehito Isobe. Overcoming strength-ductility trade-off in CoCrNi medium entropy alloy by forming fine crescent grains in laser powder-bed fusion. Materials Letters. 2023. 347. 134644-134644

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Lectures and oral presentations (114)：

Study on microstructure and mechanical property of reduced activation concentrated solid-solution alloys fabricated by two different additive manufacturing methods
(NuMat 2022 (Nuclear Materials Conference 2022) 2022)
Investigation of Co-free high entropy alloys produced by Selective Laser Melting for nuclear applications
(AM-Bench 2022 (Additive Manufacturing Benchmarks 2022))
Investigation of Reduced Activation FCC-type High Entropy Alloys under Au Ion Irradiation
(WOTWISI-6 (The Sixth International Workshop on TEM with In Situ Irradiation) 2022)
73dpaまでイオン照射した低放射化ハイエントロピー合金の組織変化
(日本金属学会講演大会(Web) 2022)
新規多元系Li合金を用いたアンモニア合成
(日本金属学会講演大会(Web) 2022)

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Education (1)：

2011 - 2014 Hokkaido University Graduate School of Engineering Division of Materials Science and Engineering

Professional career (1)：

Doctor of Philosophy (Hokkaido University)

Work history (4)：

2024/04 - 現在 Hokkaido University Faculty of Engineering Division of Materials Science and Engineering
2020/04 - 2024/03 Hokkaido University Faculty of Engineering Division of Materials Science and Engineering Assistant Professor
2018/04 - 2020/03 Japan Atomic Energy Agency Fuels and Materials Department Research Engineer
2014/04 - 2018/03 Japan Atomic Energy Agency Fast Reactor Fuel Cycle Technology Development Department Research Engineer

Awards (4)：

2024/03 - 北海道大学大学院工学研究院令和5年度若手教員奨励賞
2022/03 - 日本原子力学会材料部会第4回日本原子力学会材料部会 Best Figure賞 3Dプリンティングを用いて作製した低放射化ハイエントロピー合金の微細構造
2018/09 - 日本原子力学会材料部会第10回日本原子力学会材料部会奨励賞 9Cr-ODS鋼の微細組織と高温強度に及ぼす不純物窒素の影響
2015/10 - Forschungszentrum Jülich - ICFRM-17 ICFRM-17 Poster Award in Session 1 Effect of thermo-mechanical treatment on nano-structure of 9Cr-ODS steel

Association Membership(s) (4)：

ATOMIC ENERGY SOCIETY OF JAPAN , THE JAPAN INSTITUTE OF METALS AND MATERIALS , The Minerals, Metals & Materials Society , Materials Research Society

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