Evolution of interface microstructure of rolled Al-Mg composite plate implanted with Er powder

Abstract

Al-Mg composite plates has excellent mechanical properties and corrosion resistance, but the existence of hard and brittle phases at its interface greatly hinders its application and promotion. In this study, we reported for the first time that the formation of hard and brittle phase at the interface of Al-Mg composite plate was inhibited by implanting Er powder at the interface and multi-pass hot rolling process. The results show that the implantation of Er powder can effectively inhibit the formation of intermetallic compounds (IMC) at the interface of Al-Mg composite plates. Specifically, at the interface of Al-Mg composite plate without Er, there is 5–8 μm discontinuous IMC. But there is only 0.2 μm polycrystalline mixed structure at the interface of the Al-Mg composite plate with Er implantation. Meanwhile, compared with Al-Mg composite plate without Er, the implantation of Er can enhance the interface peeling strength of Al-Mg composite plates. Therefore, this provides a new idea for inhibiting the formation of IMC at Al-Mg interface and preparing advanced Al-Mg composites.