Effect of heat treatment on LPSO morphology and mechanical properties of Mg–Zn–Y–Gd alloys

The mechanical properties and microstructure were investigated under different Zn content and heat treatment conditions in a Mg–Zn–Y–Gd cast alloy. A part of the long period stacking order (LPSO) phases transformed to W-Mg3Zn3RE2 phases with an increase in Zn content from 0.9 at.% to 1.8 at.%, and the ultimate tensile strength (UTS) increased from 229 MPa to 248 MPa. With solution treatment at 480°C, the content of the LPSO phase and strength...