【摘要】 Mg-Sn基合金是应用前景广阔的时效强化型合金，添加合金元素可以细化Mg₂Sn沉淀相，并增强其时效强化效果，合金化元素选择及添加量是优化Mg-Sn合金力学性能的关键因素。本文总结了6种有理和9种无理的Mg₂Sn与Mg基体的取向关系，具有有理取向的Mg₂Sn沉淀位于基面呈板状和棒状，而无理取向的Mg₂Sn沉淀为非基面的板状和盘状。结合形貌和取向，进一步综述合金元素对Mg₂Sn沉淀相形核和生长的影响规律，其中Al、Zn元素促使非基面Mg₂Sn相析出；Ag、Na元素为Mg₂Sn相提供更多的形核位点；Ca和Y元素形成高熔点的三元相，时效效果不理想。基于研究现状，展望了Mg-Sn基合金研究趋势和方向。更多还原

【Abstract】 Mg-Sn based alloys are aging strengthening alloys with broad application prospect. The addition of alloying elements can refine Mg₂Sn precipitates and enhance its aging strengthening effect, and the selection and addition of alloying elements are the key factors to optimize the mechanical properties of Mg-Sn alloys. In this paper, 6 kinds of rational and 9 irrational orientation relationships（ORs） between Mg₂Sn and Mg matrix are summarized. The Mg₂Sn precipitates with rational OR are plate-like and rod-like on the basal plane, while irrationally oriented Mg₂Sn precipitates are lath-like and plate-like on the non-basal plane. Combined with morphology and ORs, the effects of alloying elements on the nucleation and growth of Mg₂Sn precipitates are further reviewed. Al and Zn elements promote the precipitation of non-basal Mg₂Sn phase; Ag and Na elements provide more nucleation sites for the Mg₂Sn phase; Ca and Y elements form a ternary phase with high melting point, and the aging effect is ideal. Based on the research status, the research trends and directions of Mg-Sn-based alloys are prospected.更多还原