2023 Fiscal Year Final Research Report
Elucidation of factors controlling the peculiar mechanical properties of high-entropy alloys
| Project Area | High Entropy Alloys - Science of New Class of Materials Based on Elemental Multiplicity and Heterogeneity |
|---|
| Project/Area Number |
18H05451
|
|---|
| 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 | Kyoto University |
|---|
Principal Investigator |
INUI HARUYUKI 京都大学, 工学研究科, 教授 (30213135)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
佐藤 裕之 弘前大学, 理工学研究科, 教授 (10225998)
田中 將己 九州大学, 工学研究院, 教授 (40452809)
土谷 浩一 国立研究開発法人物質・材料研究機構, 若手国際研究センター, センター長 (50236907)
|
|---|
| Project Period (FY) |
2018-06-29 – 2023-03-31
|
| Keywords | ハイエントロピー合金 / 降伏強度 / 引張伸び / 破壊靭性 / クリープ強度 / 積層欠陥エネルギー / 短範囲規則 / 転位 |
|---|
| Outline of Final Research Achievements |
Many high-entropy alloys are known to exhibit peculiar mechanical properties which conventional alloys cannot achieve. In the planned research, atomic structure, atomic diffusion and dislocations that carry plastic flow in high-entropy alloys were investigated down to an atomistic level by effective combinations of some advanced characterization methods such as nano-mechanical testing, scanning transmission electron microscopy, synchrotron X-ray diffraction and three-dimensional atom-probe, and factors controlling the peculiar mechanical properties based on the high-entropy effects of high-entropy alloys, high-entropy glasses and high-entropy ceramics were elucidated in order to reveal the essence of these high-entropy materials.
|
| Free Research Field |
材料物性（材料工学、構造・機能材料）
|
| Academic Significance and Societal Importance of the Research Achievements |
(1) ハイエントロピー合金の異常に高い低温降伏強度，(2)異常に高い低温引張延性・靭性と低温域における強度と延性の正の相関，(3)高温における異常に高い降伏強度，(4)強度の特異な結晶粒径依存性，(5)原子拡散に関連した高温クリープ強度について重点的に実験研究を行い，2元系や3元系の通常の合金には現れない特異な力学特性の発現メカニズム・ハイエントロピー効果の本質を根源的に解明し，卓越した研究成果を広く社会に発信できた学術的意義は非常に高い．これらの研究成果を，「強くてねばい」夢の革新的構造材料を幅広い材料系で実現するための指針提案に繋げる事ができ，社会実装の観点からもその社会的意義も高い．
|
