2015 Fiscal Year Final Research Report
Construction of function durability improvement technique of shape memory alloy
| Project/Area Number |
25420024
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Oita University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
SAKUMA TOSHIO 大分大学, 工学部, 客員教授 (10371303)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
|
| Keywords | 形状記憶合金 / 機能劣化 |
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| Outline of Final Research Achievements |
The critical stress for slip of Ti-Ni is larger than the critical stress for inducing martensitic transformation. The critical stress for slip of Ti-Ni heat-treated at 623K is as same as the critical stress for inducing martensitic transformation, however, the critical stresses for slip of Ti-Ni-Cu heat-treated at 723K and 773K are smaller than the critical stresses for inducing martensitic transformation. The superelastic property of Ti-Ni-Cu significantly deteriorates with cycles compared to Ti-Ni. The cumulative residual strains with cycles of Ti-Ni and Ti-Ni-Cu heat-treated at 773K are large compared to those at 637K and 723K. The stress amplitude at first cycle can correlate the failure lives of Ti-Ni and Ti-Ni-Cu.
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| Free Research Field |
材料強度学
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