The effect of heat treatment process on the microstructure and mechanical properties of wrought Mg-6.5Gd-3.5Y-1Zn-0.5Zr alloy was analysed by OM and SEM,etc.The results show that the wrought al-loy has the highest elongation,and the alloy has an excellent strong-tough match after T5 heat treatment,with a tensile strength of 430 MPa,a yield strength of 330 MPa,and an elongation of 10%or more,and the strength is improved by nearly 20%compared with the wrought state.This is mainly due to aging pre-cipitation strengthening and fine grain strengthening,and the fracture form is microporous aggregation frac-ture.
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