| Project/Area Number |
26820315
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Structural/Functional materials
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| Research Institution | Osaka University |
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Principal Investigator |
Todai Mitsuharu 大阪大学, 工学(系)研究科(研究院), 助教 (10610800)
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| Co-Investigator(Renkei-kenkyūsha) |
NAKANO TAKAYOSHI 大阪大学, 大学院工学研究科, 教授 (30243182)
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| Project Period (FY) |
2014-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2014: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | 生体材料 / Ti合金 / ω相変態 / 単結晶 / 疲労試験 / バリアント / 構造・機能材料 / 結晶工学 / 結晶成長 / 格子欠陥 / β型Ｔｉ-Nb合金 / 転位運動 |
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| Outline of Final Research Achievements |
The cyclic deformation behavior and dislocation microstructure in Ti-xNb single crystals were investigated by a fatigue test and the subsequent observation of transmission electron microscopy (TEM), respectively.
An anomalous softening appears in the Ti-34Nb crystal fatigued at a total strain amplitude of Δε = 0.9% and number of cycles, number of cycle over 200 accompanied by the precipitation of ω phase. In contrast, neither fatigue softening nor precipitation of ω phase was found out in the Ti-40Nb crystal. It is concluded that the fatigue softening in the Ti-34Nb crystal is closely related to the stability of β matrix and the precipitation of ω phase induced by dislocations.
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