利用金相显微镜、SEM 和万能拉伸机等手段对Mg-1.5Zn-0.2Gd 合金热轧、退火后的显微组织、结晶组织及力学性能等进行了研究。结果表明: Mg-1.5Zn-0.2Gd 合金经450℃热轧和350℃退火60min 后，其性能得到显著提高，织构极密度显著降低，最大值仅为2.3; 基面织构沿着TD 方向发生分裂，角度大约为30°; 经热轧、退火处理的合金在室温下的屈服强度和抗拉强度低于热轧状态，但表现出良好的延伸性，延伸率达29.1%; 退火过程中非基面取向的晶粒在原始大角度晶界位置形核长大，是Mg-1.5Zn-0.2Gd 合金织构得到优化的关键原因．

The microstructure,crystal structure and mechanical properties of the hot rolled and annealed Mg-1.5Zn-0.2Gd alloy were investigated by using a metallographic microscope,a SEM and a universal tensile machine.The results show that ( 1) after Mg-1.5Zn-0.2Gd alloy is rolled at 450℃ and subsequently annealed at 350℃ for 60min,the mechanical properties are significantly improved,the texture intensity significantly weakens witha maximum of only 2.3,and the TD split texture appears at ± 30°; ( 2) as compared with the alloys rolled at 450℃,the hot rolled and annealed alloy is of lower yield strength and tensile strength at the room temperature but displaysan excellent elongation which is up to 29.1%; and ( 3) during the annealing,the nucleation in non-basalorientation occurs around the pre-existing grain boundaries,which accounts primarily for the optimized texture ofthe Mg-1.5Zn-0.2Gd alloy.