| Project/Area Number |
16F16809
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Single-year Grants |
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| Section | 外国 |
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| Research Field |
Structural/Functional materials
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| Research Institution | Kyushu University |
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Principal Investigator |
陳 強 九州大学, 工学研究院, 教授 (30264451)
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| Co-Investigator(Kenkyū-buntansha) |
HE CHAO 九州大学, 工学(系)研究科(研究院), 外国人特別研究員
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| Project Period (FY) |
2016-11-07 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 2018: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2017: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2016: ¥600,000 (Direct Cost: ¥600,000)
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| Keywords | Ultrasonic Fatigue / Magnesium Alloy / LPSO Phase / Crack Initiation / Crack Propagation / Very High Cycle Fatigue / Magnesium Alloys / Ultrasonic fatigue |
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| Outline of Annual Research Achievements |
In the proposed research, high cycle fatigue properties of an as-extruded Mg-10Gd-3Y-0.5Zr alloy was investigated by focusing on its fatigue crack initiation and early propagation behavior. As a result, several important phenomena were elucidated: (1) only basal slip was activated at low cyclic stress amplitude or in high cycle regime; (2) fatigue crack initiated from the slip bands along the basal plane, leading to the formation of cleavage-like facets on the fracture surface; (3) formation of facets around the crack initiation sites consumed a vast majority of the cyclic loadings in high cycle fatigue regime, and (4) small fatigue crack propagation was significantly retarded by local microstructure heterogeneity of neighboring grains. This can be ascribed to the incompatible deformation at low cyclic stresses, resulting in the localization of slip bands within isolated grains.
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| Research Progress Status |
平成30年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
平成30年度が最終年度であるため、記入しない。
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