The chemical composition of the tested alloy used in the present study is Mg–8.49 wt.%Gd–4.49 wt.%Y–0.74 wt.%Zn–0.38 wt.%Zr alloy. The as–cast ingot with Φ165 mm4000 mm was prepared by semi-continuous casting. The cylindrical samples with Φ8 mm12 mm were prepared from the as–cast ingot.