中文摘要：

采用快速凝固法制备了Mg65＋x（Cu0．66Y0．34）30-x Zn5（x=0、5、10、15）合金样品，并通过X射线衍射（XRD）、扫描电子显微镜（sEM）对制得样品的结构和组织进行了表征。结果表明，x=O的s1样品主要由基体相、尺寸较小的块状Mg2Cu相和少量的MgZnY相组成，随着Mg含量的增加，样品中还会出现片状的Mg相及颗粒状的MgZnY相，同时Mg相会有所增加，且其尺寸也增大。通过测试合金的压缩应力应变曲线，发现x=10的S-3样品具有高的强度和良好的塑性，其最大压缩强度达到1098MPa，断裂时的应变值高达14％。

英文摘要：

Mg65＋x（Cu0.66Y0. 34） 30-x Zn5 （x= 0,5,10,15） alloys are prepared by rapid solidification. The micro structures of the samples are characterized by X-ray diffraction（XRD）, scanning electron microscope（SEM）. The results show that S-1 samples at x=0 consist of matrix,small block Mg2Cu phase and a few of MgZnY phase, and it is found that flake shaped Mg phase and MgZnY particles appear with the Mg content increases. Mg phase increases and became larger with the increase of the Mg content. The value of fracture strength and compression strain of all sam- ples is determined by compression test. It is found that S-3 sample has high strength and good ductility. The maximum compressive strength of S-3 sample at x=10 is 1098MPa and the fracture strain is up to 14%.