2020 Fiscal Year Final Research Report
Atomistic investigation for understanding dislocation climbing using timescale extending atomistic modeling
| Project/Area Number |
19K23487
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0301:Mechanics of materials, production engineering, design engineering, fluid engineering, thermal engineering, mechanical dynamics, robotics, aerospace engineering, marine and maritime engineering, and related fields
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| Research Institution | Osaka University |
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Principal Investigator |
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| Project Period (FY) |
2019-08-30 – 2021-03-31
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| Keywords | 転位上昇 / 時間拡張モデリング / ナノ構造材料 / 原子モデリング |
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| Outline of Final Research Achievements |
In this study, the atomistic mechanism of the peculiar dislocation climbing process in nanoscale crystalline material was investigated using timescale extended atomistic modeling. Atomistic simulations based on two different methods were performed to obtain atomistic detail of the dislocation climbing process as the time evolution of concentration distribution and direct atomic motion near dislocation. The results obtained in this study will be basic information for understanding the mechanism of peculiar dislocation climbing in nanoscale material.
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| Free Research Field |
計算材料力学
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| Academic Significance and Societal Importance of the Research Achievements |
ナノスケール材料はその優れた化学特性から近年エレクトロニクス分野やエネルギー分野で広く応用が試みられており，また力学特性に関しても従来のマクロ材料と比べ優れていることから実用化が期待されている．したがって，力学的負荷を受ける環境下での挙動を予測することはナノスケール材料を利用するうえで重要である．本課題では，近年実験において観察されたナノスケール材料特有の特異な変形現象である室温での転位上昇に着目し，その原子論的メカニズムの調査を実施した．本課題で得られた成果は実用環境下におけるナノ材料の強度や寿命を予測するうえで役立つ知見となる．
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