| Materials Science |
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| Microstructure and hardness of Cu-12% Fe composite at different drawing strains |
| Xiao-pei Lu, Da-wei Yao, Yi Chen, Li-tian Wang, An-ping Dong, Liang Meng, Jia-bin Liu |
| Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China; China Railway Construction Electrification Bureau Group Co., Ltd., Beijing 100036, China; College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China |
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Abstract 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.
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Received: 12 May 2013
Published: 27 January 2014
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