Microstructure and mechanical behavior of Mg ZK60/Al 1100 composite plates fabricated by co-extrusion

Abstract

Abstract Mg/Al composite plates containing two different architectures were successfully fabricated by co-extrusion directly from the as-cast alloys, with the aim to disclose the influence of multilayer architecture and interface characteristic on microstructure, texture and mechanical properties of Mg/Al plates. Our results show that texture components of Mg and Al layers in Mg/Al plates hardly change before and after annealing. The Mg layer has a strong basal texture (basal poles parallel to normal direction (ND)) with the basal poles slightly tilting from ND toward extrusion direction (ED). The Al layer exhibits high fraction of Brass, Copper and S components. The extruded Mg/Al-1 plate has yield strength of 131 MPa, but a high elongation of 17%. The extruded Mg/Al-2 plate exhibits similar yield strength (127 MPa) and a much lower elongation (4.0%) than the Mg/Al-1. After annealing at 350 °C for 3 h, both the yield strengths and elongations of Mg/Al-1 and Mg/Al-2 plates significantly decrease.