2022 Fiscal Year Final Research Report
Experimental Clarification of Intrinsic Elemental Interaction and Principles of Phase Stability in High-Entropy Alloys
| Project Area | High Entropy Alloys - Science of New Class of Materials Based on Elemental Multiplicity and Heterogeneity |
|---|
| Project/Area Number |
18H05456
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
|
| Allocation Type | Single-year Grants |
|---|
| Review Section |
Science and Engineering
|
|---|
| Research Institution | Tohoku University |
|---|
Principal Investigator |
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
荒木 秀樹 大阪大学, 大学院工学研究科, 教授 (20202749)
杉山 和正 東北大学, 金属材料研究所, 教授 (40196762)
井上 耕治 東北大学, 金属材料研究所, 准教授 (50344718)
|
|---|
| Project Period (FY) |
2018-06-29 – 2023-03-31
|
| Keywords | ハイエントロピー合金 / 規則化・相分離 / ナノ解析 / 放射光 / 三次元アトムプローブ / 陽電子消滅 / 第一原理計算 |
|---|
| Outline of Final Research Achievements |
To elucidate the fundamental principles of phase stability in high entropy alloys and to establish the guiding principle for microstructure design based on such principles, the following research subjects, (1) Clarification of phase stability in multi-component high alloys based on thermodynamics and microstructure characterization, (2) Statistical analyses of ordering/clustering using synchrotron X-ray scattering and 3D atom probe techniques, (3) Experimental and theoretical quantification of vacancy-solute interactions. Then, spinodal-ordering or short-range ordering in Fe-based medium entropy alloys and medium-range ordering and anisotropic bonding in amorphous alloys etc., were found. Furthermore, the experimental verification of vacancy formation/migration energy in a fcc high entropy alloy and its subsystems was successively made.
|
| Free Research Field |
金属組織学，鉄鋼材料学
|
| Academic Significance and Societal Importance of the Research Achievements |
本計画研究の学術的意義は，構成元素間の短距離－中距離の多体間相互作用の熱力学をX 線回折，3 次元アトムプローブなどの先端手法を用いて解析し，均一な固溶体に内在する原子レベルの構造，組成，規則度の不均一性などの変化から，ハイエントロピー合金の相安定性原理を実験的に解明するところにある．ナノ・ミクロレベルでの組織の時間変化とも関連させて相安定性原理を解明することで，ハイエントロピー合金の組織設計原理が明確化された意義は大きい．その原理に基づく力学特性の組織最適化は，ハイエントロピー合金のみならず一般の合金設計にもあてはまるものであり，広範な材料創製・プロセス設計の加速化に大きく貢献できる．
|
