Clarification of the origin of embrittlement of beta-Ti alloys, and the improvement of their mechanical properties by focusing on the deformation induced omega-phase transformation
Project/Area Number |
20760471
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Research Category |
Grant-in-Aid for Young Scientists (B)
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Allocation Type | Single-year Grants |
Research Field |
Structural/Functional materials
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Research Institution | Osaka University |
Principal Investigator |
HAGIHARA Koji Osaka University, 工学研究科, 助教 (10346182)
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Project Period (FY) |
2008 – 2009
|
Project Status |
Completed (Fiscal Year 2009)
|
Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2009: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2008: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
|
Keywords | β-Ti合金 / ω相 / 疲労 / 疲労軟化 / 単結晶 / 脆化 / 力学特性 / 塑性異方性 / 相安定性 / 応力誘起 |
Research Abstract |
We found the peculiar phenomenon of the dynamical precipitation of ω-phase during the cyclic deformation in a kind of β-Ti single crystals (Ti-35Nb-10Ta-5Zr) for the first time. We clarified that the crystal orientation (variant) of the formed ω-phase can be controlled by changing the Burgers vector of the dislocation moving during the cyclic deformation. This demonstrates that the formation mechanism of the cyclic deformation induced ω-phase is directly related to the to-and-fro motion of dislocations. In addition, we clarified that the β-Ti single crystal containing the oriented ω-phases shows strong plastic anisotropy depending on the loading orientation, which strongly affects the brittle features of the Ti-crystal in which the ω-phases were precipitated.
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Report
(3 results)
Research Products
(14 results)