| Project/Area Number |
17560614
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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 | Kanazawa University |
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Principal Investigator |
MONZEN Ryoichi Natural Science and Technology, Professor, 自然科学研究科, 教授 (20166466)
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| Co-Investigator(Kenkyū-buntansha) |
WATANABE Chihiro Natural Science and Technology, Lecturer, 自然科学研究科, 講師 (60345600)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2006: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2005: ¥3,200,000 (Direct Cost: ¥3,200,000)
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| Keywords | High conductivity alloy / Cu-Cr-Ag-Zr alloy / Nano-structure control / ECAP / Thermal stability / Zr addition / Ag addition / Cu-Ni-Si alloy |
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| Research Abstract |
The microstructure and mechanical properties of thermo-mechanically treated Cu-0.5mass%Cr alloys with and without Zr and Ag have been investigated. The addition of 0.15%Zr causes an increase in the strength and the resistance to stress relaxation of the alloy. The increase of strength or stress relaxation resistance is caused by the decrease in inter-precipitate spacing of Cr precipitates and the precipitation of Cu_5Zr phase or by the preferential formation of Cu_5Zr precipitates on dislocations in addition to Cr precipitates on dislocations. The addition of 0.1%Ag improves the strength, the bend formability and the resistance to stress relaxation. The increase in strength or stress relaxation resistance is attributable to the decrease in inter-precipitate, spacing of Cr precipitates and the suppression of recovery during aging or to the Ag-atom-drag effect on dislocation motion. The improvement of bend formability can be explained in terms of the increase in post-uniform elongation. The effect of equal-channel angular pressing (ECAP) and subsequent heat treatment on the mechanical properties of the Cu-Cr-Zr-Ag alloy has also been studied. The heat-treated ECAP alloy shows larger values of 0.2% proof stress, tensile stress and elongation to failure, but lower bend formability and stress relaxation resistance than the thermo-mechanically treated Cu-CrZr-Ag alloy.
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