中文摘要：

鉴于高力量和高锌的镁合金的差的影响坚韧， micro-alloying 的方法被采用由调整 Sb 的增加改进 Mg-10Zn-5Al 高锌镁合金的影响坚韧。结果显示出那：Sb 和 Mg 形成的 dystectic Mg3Sb2 粒子在树突的前面被散布，制止第二等的阶段的生长然后改变第二等的阶段的形态学，它在某程度精制矩阵并且显著地改进合金的影响坚韧。但是随 Sb 增加的另外的增加， Mg3Sb2 粒子集合并且形成像针的 Mg3Sb2 阶段，它分裂矩阵并且导致力量的减小和合金的影响坚韧。因此， ZA105 高锌镁合金的机械繁荣显著地与适当 Sb 增加被改进，它提供一个新方法扩大高锌镁合金的应用程序域。

英文摘要：

In view of high strength and poor impact toughness of the high-zinc magnesium alloys,the method of micro-alloying was adopted to improve the impact-toughness of Mg-10Zn-5Al high zinc magnesium alloys by adjusting the addition of Sb.The results show that：the dystectic Mg3Sb2 particles formed by Sb and Mg are distributed in the front of dendrite,restrain the growth of the secondary phase and then change the morphology of the secondary phases,which refines the matrix in some extent and improves the impact-toughness of the alloy significantly.But with further increase of Sb addition,Mg3Sb2 particles congregate and form needle-like Mg3Sb2 phase,which dissevers the matrix and leads to the reduction of the strength and impact-toughness of the alloys.Hence,the mechanical prosperities of ZA105 high zinc magnesium alloy are significantly improved with appropriate Sb addition,which provides a new way to extend the application fields of high zinc magnesium alloy.