Inhibition effect of longitudinal alternating current during annealing on growth of interfacial layers of copper cladding aluminum composite

摘要

The effect of longitudinal alternating current (LAC) on the growth of the interfacial layers of the copper cladding aluminum (CCA) composite flat bar during isothermal annealing was investigated. The results showed that the application of LAC could remarkably inhibit the growth of interfacial compounds as well as improve the interfacial bonding property of the CCA composite. When the CCA flat bars were annealed at temperatures ranging from 723 to 773 K for 1 h with a LAC density higher than 0.625 A/mm2, the total thickness of the interfacial compound layers was reduced by more than 75% in comparison to CCA flat bars annealed without LAC. The reduction of the thickness of the interfacial layers resulted in an improvement of the bonding strength of the CCA composite. The mechanism of the inhibition effect was that the application of LAC could accelerate the vacancy annihilation in component metals.