Effect of Heat Treatment on Microstructure, Tensile Properties and Damping Capacity of Mg-Zr Wrought Alloy

摘要

Microstructures, tensile properties, and damping capacity of the hot-rolled and annealed K1A (Mg-0.7%Zr) wrought alloy were investigated in comparison with those of a commercial AZ31 (Mg-3%Al-l%Zn-0.2%Mn) wrought alloy. The Kl A alloy in hot-rolled state shows 116 and 183MPa of tensile yield strength (σ_(ys)) and ultimate tensile strength (σ_(uts)), respectively, which are significantly higher than those (40 and 130MPa) of the K1A casting alloy. The hot-rolled K1A alloy exhibits 10.4% of specific damping index (SDI) and subsequent annealing treatment remarkably enhances its SDI up to 19.7% without sacrificing the tensile strength. Although the annealed AZ31 alloy has 3.9% of low SDI, its tensile properties are still higher than those of the K1A alloy.