2023 Fiscal Year Final Research Report
Elucidation of strengthening mechanisms in nano-precipitated aluminum alloys by in-situ TEM observation and dislocation dynamics
| Project/Area Number |
21H01649
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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 | Yokohama National University |
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Principal Investigator |
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | TEM内その場引張試験 / 分子動力学法 / 刃状転位 / 析出強化 / せん断変形 / 転位の張出し / GPゾーン / 強化機構 |
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| Outline of Final Research Achievements |
In this study, in-situ tensile-testing transmission electron microscopy observation was performed on aluminum alloys for correlating nano-scale precipitates with sliding behavior of dislocations, and compared with computational outcomes from a molecular-dynamics simulation. New findings obtained include that small pieces of precipitates sheared by mobile dislocations rotate and then act as obstacles to further dislocation sliding, and that disc-like (111) GP zones exhibit the largest strengthening effect among other types of GP zones with different habit planes (variants).
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| Free Research Field |
金属組織学、計算材料学
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| Academic Significance and Societal Importance of the Research Achievements |
学術的意義としては、従来は溶質原子が集合しているだけとも認識されていたナノ析出強化の概念が変わり、溶質原子の不均一性を積極的に利用する新たな学術領域を創造できたことが挙げられる。また社会的意義としては、構造用金属材料において特に重要な力学特性に及ぼすナノ析出組織の有用性を明確にでき、高強度化と省資源化の両立が望まれる材料開発において、少量添加で大きな硬化が見込まれる合金の開発につながる成果が得られた点が挙げられる。
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