Investigation on Interface Evolvement Law of Cast-Rolling Cu/Al Composite Plate
XIE Jingpei1,2, LIU Zhe1, WANG Aiqin1, LYU Shijing1, MAO Zhiping3, LIU Shuaiyang1, TIAN Hanwei1
1 College of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023 2 Collaborative Innovation Center of Nonferrous Materials of Henan Province, Luoyang 471023 3 Institute of Physical Science and Engineering, Zhengzhou University, Zhengzhou 450001
Abstract: The microstructure and phase compositions of the interface layer of Cu/Al composite plate prepared by cast-rolling were investigated by means of OM, SEM and XRD. The interfacial evolution law during the rolling and annealing processes were analyzed. The results showed that the process of interface evolution during heat treatment mainly consisted of four stages: the formation of supersaturated solid solution, the nucleation of intermetallic compounds, the intermetallic compounds were laterally joined along the interface and the thickening of interface layer. The interface cracks propagated along the CuAl2 layer in the process of peeling, with the extension of annealing time, the morphology of peeled surface changed from tearing edge and groove to tearing platform and crack. During the rolling process, the interface layer was broken, pure copper and pure aluminum were squeezed into the cracks and forming a direct contact area. With the increase of rolling screwdown ratio, the proportion of direct contact zone accounted for the total length of the interface gradually increased. The broken interfacial intermetallics were embedded between pure copper and pure aluminum and the fragments were in a certain angle with the interface.
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2019, Vol. 33 
