National Center for Copper Smelting and Process Engineering Technology Research

Ganzhou, China

National Center for Copper Smelting and Process Engineering Technology Research

Ganzhou, China
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Li Y.,Jiangxi University of Science and Technology | Li Y.,National Center for Copper Smelting and Process Engineering Technology Research | Liu R.,Jiangxi University of Science and Technology | Liu R.,National Center for Copper Smelting and Process Engineering Technology Research | And 2 more authors.
Advanced Materials Research | Year: 2012

Cu-10Fe-3Ag in situ composites containing (0-0.30%) Ce elements were prepared by cold drawing and intermediate heat treatments. Microstructure was observed, and mechanical properties and electrical conductivity were measured for alloys at various drawing strain ratio. Adding Ce element could reduce the size of primary Fe and Cu dendrites of Cu-10Fe-3Ag. Ultimate tensile strength increased but electrical conductivity decreased with the increase of drawing strain. Ce additions in Cu-10Fe-3Ag slightly increased the strength at low strain and effectively improved the conductivity at high strain. Both strain hardening rate and conductivity loss of Cu-10Fe-3Ag containing Ce were reduced at lower strain than Cu-10Fe-3Ag. © (2012) Trans Tech Publications.


Li Y.,Central South University | Li Y.,National Center for Copper Smelting and Process Engineering Technology Research | Yi D.-Q.,Central South University | Liu R.-Q.,National Center for Copper Smelting and Process Engineering Technology Research | Sun S.-P.,Central South University
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2011

The deformation-processed Cu-10Fe-3Ag in-situ composite was prepared using fusion cast in air. After aging 6 h at different temperatures, the microstructure of Cu-10Fe-3Ag in-situ composite was studied by SEM, the lattice space of Cu-10Fe-3Ag in-situ composite was tested by XRD, and the mechanism of Ag element was analyzed during ageing treatment. The results show that the presence of Ag can not only accelerate γ-Fe precipitation from the Cu matrix, but also reduce the thermal stability of Fe fibers. The hardness and conductivity of Cu-10Fe-3Ag in-situ composite increase at first and then decrease with the ageing temperature increasing. The conductivity of Cu-10Fe-3Ag in-situ composite can reach 58.4% IACS when ageing at 475°C for 6 h. The fractures of the alloy are all ductile rupture and the dimples become smaller with the ageing temperature increasing.


Li Y.,Central South University | Li Y.,National Center for Copper Smelting and Process Engineering Technology Research | Yi D.-Q.,Central South University | Liu R.-Q.,National Center for Copper Smelting and Process Engineering Technology Research
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2011

Effect of aging treatment on microhardness, tensile strength and electric conductivity of Cu-0.15Ag-0.1Fe alloy was studied. The results show that the microhardness and the tensile strength of Cu-0.15Ag-0.1Fe alloy increased rapidly with increasing the aging time and temperature and then decreased slowly. Higher microhardness and tensile strength can be obtained for the alloy after solution at 960°C for 1 h and aging at 500°C for 2 h, the microhardness is 124 HV and the tensile strength is 442 MPa. After aging at 500°C for 6 h, the electric conductivity reaches 82.5%IACS. The strengthening phase in the alloy is γ-Fe particle by transmission electron microscopy, which is different from the previous reports that the strengthening phase is α-Fe in Cu-Fe alloys.


Li Y.,Central South University | Li Y.,National Center for Copper Smelting and Process Engineering Technology Research | Yi D.-Q.,Central South University | Liu R.-Q.,National Center for Copper Smelting and Process Engineering Technology Research | Sun S.-P.,Central South University
Cailiao Kexue yu Gongyi/Material Science and Technology | Year: 2011

To improve the wear performance of contact wire of Cu-Ag alloys, trace iron was added, and the influence of electrical current, sliding speed and load on the wear morphology and wear rate of Cu-Ag-Fe alloys were studied. The results show that the wear rates of Cu-Ag-Fe alloys increase with the increasing of electrical current, sliding speed and load. The wear morphologies indicate that the adhesive wear, abrasive wear and electrical erosion are the dominant mechanisms during the electrical sliding processes. And with the electrical current increased, the phenomena of the adhesive wear have intensified. The electrical sliding wear resistance of Cu-Ag-Fe alloys is 2 times of that of Cu-Ag alloys because of the aging strengthening action of iron, which increases the service life of Cu-Ag alloys.

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