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采用表面活性元素Sb微合金化的方法制备了Mg-5Al-2Sr-xSb(x=0,0.3,0.6,1.0)合金,通过金相显微镜、X射线衍射仪、扫描电镜和力学性能测试等方法研究了Sb含量对Mg-5Al-2Sr合金微观组织和力学性能的影响.结果表明,Mg-5Al-2Sr-xSb合金铸态组织主要由枝晶α-Mg、沿晶界或分布在枝晶间的层状或离异共晶的Al4Sr相、块状三元Mg9Al3Sr相(τ相)和颗粒状SbSr2相组成,随着Sb含量的增加,Sb-Sr2相的数量逐渐增多,τ相逐渐减少.Sb的质量分数为0.6%时,断续分布的Al4Sr相和细小弥散分布的Sb-Sr2相能够提高Mg-5Al-2Sr合金的室温和高温(150℃)机械性能.
Mg-5Al-2Sr-xSb (x = 0,0.3,0.6,1.0) alloys were prepared by micro-alloying of surface active element Sb. The microstructure, The effect of Sb content on the microstructure and mechanical properties of Mg-5Al-2Sr alloy was studied.The results show that the as-cast microstructure of Mg-5Al-2Sr-xSb alloy mainly consists of dendritic α-Mg, along the grain boundaries or in the interdendritic Layered or divorced eutectic Al4Sr phase, bulk ternary Mg9Al3Sr phase (τ phase) and granular SbSr2 phase composition, with the increase of Sb content, the number of Sb-Sr2 phase gradually increased, τ phase decreased gradually .Sb The mass fraction of 0.6%, the intermittent distribution of Al4Sr phase and fine dispersed Sb-Sr2 phase can improve the Mg-5Al-2Sr alloy at room temperature and high temperature (150 ℃) mechanical properties.