The Mg–9Al–5Sn−xSb (x = 0.0, 0.3, 0.6, 1.0, 1.5 wt%) alloys were prepared by a simple alloying process followed by hot extrusion with an extrusion ratio of 28.2. The effects of Sb additions on the microstructure and mechanical properties of the Mg–9Al–5Sn alloys were investigated by optical microscopy, X-ray diffraction, transmission electron microscopy, scanning electron microscopy equipped with an energy-dispersive X-ray spectrometer. The results indicated that the phases α-Mg matrix, Mg₂Sn, Mg₃Sb₂ and Mg₁₇Al₁₂ exist in the as-cast Sb-containing alloys. Sb addition results in the precipitation of Mg₃Sb₂. The dendritic size of these alloys decreases with the addition of Sb. Both their ultimate tensile strength and yield strength of extruded alloys increase, and their elongation decreases gradually with increasing the content of Sb. The better mechanical properties of the as-extruded alloys were achieved due to the refined grains and the formation of dispersive second phases Mg₃Sb_2.

Mg-9Al-5Sn- x Sb（x  = 0.0、0.3、0.6、1.0、1.5 wt％）合金是通过简单的合金化工艺制备的，然后以28.2的挤压比进行热挤压。通过光学显微镜，X射线衍射，透射电子显微镜，配有能量色散X射线光谱仪的扫描电子显微镜研究了添加Sb对Mg-9Al-5Sn合金的组织和力学性能的影响。结果表明，铸态含Sb合金中存在相-Mg基体，Mg ₂ Sn，Mg ₃ Sb ₂和Mg ₁₇ Al _12相。锑的添加导致Mg ₃ Sb ₂的沉淀。这些合金的树枝状尺寸随着Sb的添加而减小。随着Sb含量的增加，挤压合金的极限抗拉强度和屈服强度均增加，伸长率逐渐降低。由于精炼晶粒和形成分散的第二相Mg ₃ Sb ₂而获得了更好的机械性能_。