The microstructures and mechanical properties of Mg-10Al alloy containing different Sb content at room temperature and 150℃ were investigated. The results show that with an appropriate addition of Sb. lot of acicu-lar Mg1Sb2-phase was formed and dispersive distributed in the Mg-10Al alloy. Meanwhile, the network eutectic structure was suppressed with resulting in a refined microstructure with refined primary α-Mg grains and dispersive distributed β-phase. The best mechanical properties including tensile strength, yield strength and elongation both at room and elevated temperatures were attained in the Mg-10Al alloy containing 0. 5% Sb. The tensile strength and the elongation of Mg-10Al-0. 5Sb alloy at 150β were 180 MPa and 19%, which increase by 30% and 90% compared to those of the Mg-10Al alloy, respectively. Furthermore, the Sb-modified Mg-10Al alloy maintained a higher strength at 150β, equivalent to that at room temperature, while the strength of the unmodified Mg-10Al alloy decreased obviously.%研究了不同Sb含量的Mg-10Al合金的微观组织及在室温和150℃高温下的力学性能.结果表明,加入适量的Sb,Mg-10Al合金中生成了弥散分布的针状Mg3Sb2相,a-Mg初晶显著细化,抑制了网状共晶组织的形成.当Sb含量为0.5％(质量分数)时,组织细化效果最佳.随着Sb含量的增加,室温及高温下合金的抗拉强度、屈服强度和伸长率先升高后降低,均在Sb含量为0.5％(质量分数)时获得最佳综合性能.Mg-10Al-0.5Sb合金在150℃的抗拉强度为180 MPa、伸长率为19％,比Mg-10Al合金分别提高了30％和90％.此外,在150℃条件下,含Sb合金仍保持了与其在室温下相当的强度,而未添加Sb的Mg-10Al合金的强度则明显下降.
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