| Project/Area Number |
12650704
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Structural/Functional materials
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| Research Institution | Niihama National College of Technology |
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Principal Investigator |
TAKAHASHI Tomoshi Department Mater. Eng. Professor, 材料工学科, 教授 (30110159)
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| Co-Investigator(Kenkyū-buntansha) |
MINAMINO Yoritoshi Graduate School, Osaka University, 大学院・工学研究科応用理工学系, 教授 (30116107)
SHIGA Shinya Niihama National College of Technology, Associate Professor, 材料工学科, 助教授 (60235512)
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 2002: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 2001: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2000: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Keywords | Ti-Al-Cr alloy system / Ultra-impact high pressure / L1_2 structure / Interdiffusion / Functionally gradient microstructure / Ll_2構造 / Ti-Al-Cr合金 |
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| Research Abstract |
The interdiffusion experiments and the formation experiments of gradient microstructure have been performed in a temperature range from 1273 to 1573 K by using the diffusion couples of Ti/Ti-Al-Cr, Ti-Al/Ti-Cr and Ti-Al-Cr (Ll1_0) /TrAl-Cr (L1_2) alloys. Furthermore, the high-speed impact deformation experiments have been carried out in the above Ti alloys. (1)The gradient microstructure have been observed in each temperature. In the Ti/Ti-Al-Cr couples, the martensitic structure are formed near the Matano interface. The alloy couples soften at the composition hi the terminal alloy side, because of the formation of retained β phase.
(2)The concentration profiles indicate that the diffusion distance of Cr is longer than that of Al in the solid solutions. The diffusion paths S-shaped curves. The binary and ternary interdiffusion coefficients are not sensitive to the solute concentrations.
(3)The change in microstructure and hardness of Ti-38.1Al-4.8Cr (L1_0) alloys depend on cooling rate after the heat treatment at 1473 K for 24 h.
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