Effect of continuous induction annealing on the microstructure and mechanical properties of copper-clad aluminum flat bars |
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| Authors: | Xin-hua Liu Yan-bin Jiang Hong-jie Zhang Jian-xin Xie |
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| Affiliation: | Key Laboratory for Advanced Materials Processing of the Ministry of Education, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | Copper-clad aluminum (CCA) flat bars produced by the continuous casting–rolling process were subjected to continuous induc-tion heating annealing (CIHA), and the effects of induction heating temperature and holding time on the microstructure, interface, and me-chanical properties of the flat bars were investigated. The results showed that complete recrystallization of the copper sheath occurred under CIHA at 460°C for 5 s, 480°C for 3 s, or 500°C for 1 s and that the average grain size in the copper sheath was approximately 10.0μm. In the case of specimens subjected to CIHA at 460–500°C for longer than 1 s, complete recrystallization occurred in the aluminum core. In the case of CIHA at 460–500°C for 1–5 s, a continuous interfacial layer with a thickness of 2.5–5.5μm formed and the thickness mainly increased with increasing annealing temperature. After CIHA, the interfacial layer consisted primarily of a Cu9Al4 layer and a CuAl2 layer; the average interface shear strength of the CCA flat bars treated by CIHA at 460–500°C for 1–5 s was 45–52 MPa. After full softening annealing, the hardness values of the copper sheath and the aluminum core were HV 65 and HV 24, respectively, and the hardness along the cross section of the CCA flat bar was uniform. |
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| Keywords: | metal cladding copper-clad aluminum annealing interfaces mechanical properties |
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