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Jia S.-G.,Henan University of Science and Technology | Jia S.-G.,Henan Key Laboratory of Advanced Nonferrous Metals | Su J.-H.,Henan University of Science and Technology | Song K.-X.,Henan University of Science and Technology | And 2 more authors.
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2012

Cu-Ag, Cu-Ag-Zr and Cu-Ag-Zr-Ce alloys were produced by using a vacuum induction furnace. The electrical sliding wear properties of different alloys wires were studied by a self-made sliding wear tester that can simulate the tribological conditions of sliding current collectors on contact wires. The morphologies of Cu-Ag-Zr-Ce alloy before and after wear were analyzed by scanning electron microscope. The results show that the wear rate of the Cu-Ag-Zr-Ce alloy increases with increasing electrical current and sliding distance. The adhesive wear, abrasive wear and electrical erosion are the dominant mechanisms of the Cu-Ag-Zr-Ce alloy during the electrical sliding processes. Compared with Cu-Ag and Cu-Ag-Zr alloys under the same test condition, Cu-Ag-Zr-Ce alloy has much better wear resistance. The wear rate of the Cu-Ag alloy is 2-4 times as large as that of Cu-Ag-Zr and Cu-Ag-Zr-Ce alloys.

Zhang Y.,Henan University of Science and Technology | Zhang Y.,Henan Key Laboratory of Advanced Nonferrous Metals | Wang G.,Henan University of Science and Technology | Wang G.,Henan Key Laboratory of Advanced Nonferrous Metals | And 7 more authors.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2013

Influence of DC electric current on maximal conductivity and aging rate of thermally aged Cu-0.86Cr alloy was investigated, and effects of the alloy traditionally aged without DC current were analyzed comparatively. In contrast with traditional condition, the maximal conductivity of the alloy aged with DC current is increased to 48.23 MS/m from 47.92 MS/m, meanwhile, DC electric current can enhance aging rate of the alloy, where the conductivity ratio of the alloy aged for 6h with and without current reaches its maximal conductivity of 98% and 94%, respectively. One reason of enhancing the precipitation can be attributed to the Joule heating due to self-electric resistance, on the other hand, electron wind force exerted by drift electron can promote the mobility of excess vacancies and dislocation, mass dislocation and clusters and pairs of vacancy, which offers the nucleation sites for the precipitation of solute atoms.

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