| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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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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