中文摘要：

Mg-Y-Sm系耐热镁合金由于具有优良的高温强度和抗蠕变性能,越来越受到重视。综述了Mg-Y-Sm系耐热镁合金的成分设计,介绍了该合金系的组织和性能研究进展,探讨了存在的问题并展望了发展趋势。

英文摘要：

Heat resistant Mg-Y-Sm alloys attach more and more importance due to the good strength and creep resistance at high temperature. The composition designs of heat resistant Mg-Y-Sm alloys were reviewed. The research progress of mierostructure and properties of Mg-Y-Sm alloys was introdued. The existing problems were discussed and the development trend was looked forward.