| 研究課題/領域番号 |
17F17732
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| 研究機関 | 九州大学 |
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研究代表者 |
陳 強 九州大学, 工学研究院, 教授 (30264451)
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| 研究分担者 |
SHAO XIAO-HONG 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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| 研究期間 (年度) |
2017-10-13 – 2020-03-31
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| キーワード | Fatigue Mechanism / Microstructure / Magnesium Alloy / LPSO Phase / Characterization |
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| 研究実績の概要 |
It is well known that the deformation modes and deformation texture of LPSO reinforced Mg alloys are significantly different from the Mg alloys free of LPSO structures. The severe strain localization thus should be closely linked to the LPSO phase, dislocations, deformation kink, and deformation twins. Slip bands, LPSO-matrix interface, kink boundaries, and twin boundaries are all possible fatigue crack initiation sites. Further, crack may propagate along above-mentioned interfaces, in matrix, or in LPSO structures, or be blocked by these interfaces. The present work is focused on the clarification of dominated crack initiation and propagation mechanism so as to improve fatigue damage resistance of the magnesium alloys via designing microstructure.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
1. Strong interactions between LPSO structures and deformation twins were systematically characterized.
2. Solute atoms segregation along deformation-induced interfaces was detected in Mg-LPSO alloys.
3. The fatigue crack site was detected to be along basal plane, other than twin boundary, in single phase Mg-RE alloy, which will advance our further understanding of fatigue mechanism of Mg-LPSO alloy.
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| 今後の研究の推進方策 |
1. In order to understand the fatigue behavior of Mg-LPSO phase, we will identify the possible crack nucleation sites and investigate the possible crack evolution mechanisms in Mg-LPSO alloy through SEM and TEM, where the basal plane, LPSO-Mg interface, and twin boundary would be focused on.
2. Possible solute atoms redistribution during fatigue test would be expected due to the cyclic load, and will be elucidated based on the unique deformation process.
3. To highlight the effect of LPSO phases on fatigue behavior of Mg alloys, we will further systematically investigate the different fatigue mechanism, including the nucleation sites and crack propagation, for single phase Mg-RE alloy and Mg-LPSO alloy.
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