Synergistically improved damping, elastic modulus and mechanical properties of rolled Mg-8Li-4Y–2Er-2Zn-0.6Zr alloy with twins and long-period stacking ordered phase

Abstract Mg-8Li-4Y–2Er-2Zn-0.6Zr alloy with high damping, elastic modulus and mechanical properties was prepared by heat treatment and cold rolling. 18R-type long-period stacking ordered phase, LPSO, is introduced into the alloy after heat treatment at 450 °C for 6 h. After cold-rolling, twins and kinking of the LPSO phase appear, causing the increase of damping capacity from 0.01 to 0.02. The tensile strength is increased from 142 MPa to 221 MPa. Additionally, the elastic modulus of the cold-rolled alloy reaches 48.9 GPa. The effects of the LPSO phase and twins on the damping and mechanical properties of the alloy were investigated. The cause of the high elastic modulus of cold-rolled alloy was analyzed.