首页|Effects of fine fiber structures on the mechanical and electrical properties of cold rolled Cu-Ag sheet
Effects of fine fiber structures on the mechanical and electrical properties of cold rolled Cu-Ag sheet
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The recent progress in the electrical, electronic, and automobile industries requires conductive materials to possess not only a high conductivity, but also high strength, as well as reasonable cost. In order to reach this goal, extensive studies have been carried out on various Cu alloys including Nb [1], Fe [2], Cr [3] and Ag [4] in situ composite with cold deformation and intermediate heat treatment. Among many Cu composite alloys, Cu-Ag alloy has a eutective two-phase structure. During the cold deformation such as rolling, drawing, forging and swaging, two phases composed of Cu-rich solid solution and Ag-rich solid solution, are compressed and elongated along the direction of deformation; the two phases form a fine fiber microstructure. Severe cold deformed Cu composites have ultra-high tensile strength which is larger than the value predicted by the rule of the mixture of the two materials. The ultra high strength can be explained by the very fine fibrous microstructure and the high dislocation density between the interfaces of two materials. The electricals conductivity is generally inversely proportional to the mechanical property. This problem can be overcome by an intermediate heat treatment which results in the precipitation of a second phase.
Won-Bae Lee、Eui-Han Yoon、Seung-boo Jung
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Department of Advanced Materials Engineering, Sungkyunkwan University, 300 Cheoncheon-dong, Jangan-gu, Suwon 440-746, Korea
Daechang REsearch Center, 4 Na 506, Siwha Industrial Complex, # 1292-4, Jeongwang-dong, Siheung 429-450, Korea
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