2014 Fiscal Year Final Research Report
Design principle of super long life shape memory alloy by controlling topological defect of diffusionless transformation
| Project/Area Number |
24686077
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Partial Multi-year Fund |
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| Research Field |
Structural/Functional materials
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Keywords | マルテンサイト変態 / 形状記憶合金 / 疲労損傷 / ドメイン組織 / 電子顕微鏡 / 格子欠陥 |
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| Outline of Final Research Achievements |
The relationship between topological defect at domain interface that is the source of the fatigue damage and the preferential microstructure was investigated in some Ti-based shape memory alloy to reveal the design principle of the super long life shape memory alloy for biomedical use and energy harvesting. It was revealed that the twist-angle at the interfaces between martensite domains (an indicator of the incompatibility of microstructure) determines the preferential microstructure and defect structure. In addition, the twist-angle can be controlled by the lattice parameters that are determined by the alloy composition. This indicates that the development of the super long life shape memory alloy is possible by controlling simultaneously the twist-angle of the topological defect and the transformation temperature of the martensitic transformation.
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| Free Research Field |
金属組織学
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