Microstructure and properties of new Mg-Li-Zn wrought alloys

摘要

Cold-rolling workability, heat treatment characteristics and mechanical properties of Mg-5% — 22%Li-2%Zn(mass fraction) wrought alloys were studied. Density of alloys is between 1.19 and 1. 62 g/ cm~3. The limit of reduction for cold rolling of the β phase alloys at 16% and 22% Li exceeds 90% at room temperature. The properties and microstructures of Mg-Li-Zn alloys were studied, which were homogenized, cold rolled, then annealed at different temperatures. Recrystallization behaviors of the alloys were investigated through microstructures observing and hardness measuring. The results show that the cast billets are suitable for rolling after homogenization at 573K for 12 h for Mg-9Li-2Zn-2Ca alloy and at 523K for 24 h for Mg-9Li-2Zn-2Ca alloy. The cold rolled plates were completely recrystallizated by annealing at 573K for 1 h.