2021 Fiscal Year Final Research Report
Harmonic Microstructure Control and Mechanical Properties of of High Entropy Alloy
| Project/Area Number |
19H02466
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 26040:Structural materials and functional materials-related
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| Research Institution | Ritsumeikan University (2021)
Shizuoka Institute of Science and Technology (2019-2020) |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
感本 広文 静岡理工科大学, 理工学部, 教授 (20273328)
川畑 美絵 (太田美絵) 立命館大学, 総合科学技術研究機構, 准教授 (30710587)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 粉末冶金 / 微細組織制御 / メカニカルミリング / 放電プラズマ焼結 |
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| Outline of Final Research Achievements |
High entropy alloy (HEA) which is a brand-new concept metallic material, has excellent mechanical properties and has attracted a lot of attention. An improvement of the mechanical properties by microstructure control is important even for HEA. A harmonic structure has fine grain regions which are arranged in a three-dimensional network, and coarse grain regions which are arranged between them. The harmonic structure materials exhibit excellent mechanical properties with high strength and high ductility. HEA powder is produced into a harmonic structure HEA by applying the mechanical milling and spark plasma sintering methods. The harmonic structure HEA showed superior mechanical properties with higher strength and higher ductility than the homogeneous grain material. It is clarified that the control of deformation twins is important for improving the mechanical properties of the harmonic structure HEA.
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| Free Research Field |
材料工学
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| Academic Significance and Societal Importance of the Research Achievements |
ハイエントロピー合金は，その概念が発表されてからまだ間もなく，まだ不明点も多いが，多くの研究者による様々な研究が行われており，今後の発展に期待できる新材料である．本研究は，世界的に注目されているハイエントロピー合金の研究と調和組織制御の研究のそれぞれの融合的な位置にある研究であり、優れた研究を組み合わせて、さらに優れた材料開発研究につなげるものである。このようにハイエントロピー合金に調和組織制御を加えることにより、従来のハイエントロピー合金よりもさらに高強度・高靱性を示すことが可能であり、調和組織制御はハイエントロピー合金のもつ力学特性を極限まで引き出すことに大きく貢献できる．
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