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Liu J.B.,China Jiliang University | Liu J.B.,Zhejiang University | Zhang L.,University of Science and Technology Beijing | Dong A.P.,China Railway Construction Electrification Bureau Group Co. | And 3 more authors.
Materials Science and Engineering A

Cu-6. wt.% Ag with Cr and Zr additions were melt and cast and then cold drawn to wires. For the specimens at various drawing strains, the microstructure was observed, and tensile strength and electrical conductivity were determined. Simply adding Cr obviously increases strength but decreases electrical conductivity. Co-adding Cr and Zr further increases strength and slightly improves electrical conductivity. Together adding Cr and Zr not only produces Cr and Zr-rich particles but also changes the amount of Ag-rich phase in Cu-6. wt.% Ag, which are responsible for the changes of the properties. © 2011 Elsevier B.V. Source

Lu X.-P.,Zhejiang University | Yao D.-W.,Zhejiang University | Chen Y.,Zhejiang University | Wang L.-T.,China Railway Construction Electrification Bureau Group Co. | And 3 more authors.
Journal of Zhejiang University: Science A

Cu-12% Fe (in weight) composite was prepared by casting, pretreating, and cold drawing. The microstructure was observed and Vickers hardness was measured for the composite at various drawing strains. Cu and Fe grains could evolve into aligned filaments during the drawing process. X-ray diffraction (XRD) was used to analyze the orientation evolution during the drawing process. The axial direction of the filamentary structure has different preferred orientations from the radial directions. The strain of Fe grains linearly increases with an increase in the drawing strain up to 6.0, and deviates from the linear relation when the drawing strain is higher than 6.0. With an increase in the drawing strain, the microstructure scales of Fe filaments exponentially decrease. The density of the interface between Cu and Fe phases exponentially increases with an increase in the aspect ratio of Fe filaments. There is a similar Hall-Petch relationship between the hardness and Fe filament spacing. The refined microstructure from drawing deformation at drawing strains lower than 3.0 can induce a more significant hardening effect than that at drawing strains higher than 3.0. © 2014 Zhejiang University and Springer-Verlag Berlin Heidelberg. Source

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