| Project/Area Number |
03650548
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
金属加工(含鋳造)
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
IKEDA Keisuke TOHOKU UNIVERSITY, DEPT. OF ENG., PROF., 工学部, 教授 (40005921)
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| Co-Investigator(Kenkyū-buntansha) |
NISHIMURA Keio TOHOKU UNIVERSITY, DEPT. OF ENG., RESEARCH ASIST., 工学部, 助手 (00218190)
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| Project Period (FY) |
1991 – 1992
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| Project Status |
Completed (Fiscal Year 1992)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1992: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1991: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | Cu-Nb alloy / Mechanical properties / Electric conductivity / Residual resistivity ratio / 導電率 / 残留抵抗比 / 電気伝導度 / HIP / CuーNb合金 / せん維強化 / 強化機構 / 比抵抗 |
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| Research Abstract |
Mechanical properties and electric conductivities were evaluated for heavily cold-drawn wires of copper-niobium alloys containing 10, 15 and 20 wt% Nb. The strength of these alloy wires at room temperature increased with both Nb content and overall reduction of area. The maximum strength of Cu-20 wt% NNb wire reduced by 2x10^4 in cross-sectional area was 1.7 GPa, which was drastically higher than the value predicted by the rule of mixture. The strength of the Cu-Nb wire was proportional to d^<-1/2> (d;diameter of Nb filament). The strength and specific resistivity dropped by annealing. The annealing temperature where the specific resistivity began to decrease varied depending on the Nb content. The Cu-10 wt% Nb alloy wire alone presented both conductivity above 70% of pure copper and strength of more than 1 GPa. The residual resistivity ratio, R.R.R. of Cu-Nb wires was about 10, which was a tenth of the value for pure copper. This results suggests that the electron scattering on the Cu-Nb interface is considerably high. It was tried to fabricate the Cu-Nb wire by extrusion and HIP of the mixture of Cu and Nb powders. However, no sound product obtained, because of bad weldability between Cu and Nb particles.
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