Effects of Transition Layer on Bending Resistance in Copper-Clad Aluminum Composite Casting
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JMEPEG (2019) 28:3560–3566 https://doi.org/10.1007/s11665-019-04136-6
Effects of Transition Layer on Bending Resistance in Copper-Clad Aluminum Composite Casting Shuying Chen, Lei Zhang, Shengnan Ma, Xudong Yue, and Guowei Chang (Submitted June 10, 2018; in revised form February 23, 2019; published online June 18, 2019) The performance of the transition layer in a Cu/Al composite casting directly affects the quality of subsequent plastic deformation processing; however, there are no universal or standardized measurement indices for the performance of the transition layer. In this study, Cu/Al composite castings were prepared using the pouring aluminum method, and the resulting solidification microstructures on the bending resistance were investigated. The results of this study lay a theoretical foundation for the development of the plastic processing technologies of these composite castings. A thinner transition layer in the Cu/Al composite casting led to improved bending resistance. In addition, for a fixed total thickness of the transition layer, the bending resistance was mainly controlled by the c/b interface and b + eutectic (a + b) microstructure, and the thickness of the c phase had a negligible effect on the bending resistance. The c/b interface cracked first when the transition layer bore the tensile and shear stress during the bending process, which resulted in the transition layer easily separating from the copper. The bending resistance of the transition layer can be feasibly judged by measuring the bending angle of the specimen tip, which can be easily performed when the specimen bends toward the aluminum direction, suggesting that our proposed method has considerable practical significance. Keywords
bending resistance, composite, copper-clad aluminum, measurement index, transition layer
1. Introduction Many methods for the preparation of copper-clad aluminum (CCA) have been developed (Ref 1-15). Meanwhile, the microstructures and formation process of the transition layer have also been investigated by many researchers (Ref 16-25). However, research on the performance of the transition layer is relatively lacking. For example, Xie et al. (Ref 26) prepared CCA ingots using the bimetallic horizontal continuous casting method and observed that the compound layer in the transition layer controlled the shear performance of the resulting material. Kim et al. (Ref 27) prepared Cu/Al/Cu samples using the solid– solid composite method and investigated the bending behavior as well as the crack formation process. Uscinowicz (Ref 28) prepared a Cu-Al composite work blank using the solid–solid composite method, rolled the work blank into a sheet, and measured the tensile properties of the sheet in different directions to determine the relationship between the tensile properties of the composite sheet and those of pure Cu and pure Al. Eslami et al. (Ref 29) compared the shear strength of coldwelded and diffusion-bonded Al/Cu bimetallic rods produced using the ECAE process. The CCA ingots were prepared and processed in
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