研究了Al5TiB对Mg-8Zn-4Al-0.3Mn铸造镁合金显微组织的影响.结果表明,Mg-8Zn-4Al-0.3Mn铸造镁合金的显微组织主要由Mg相、φ(Al2Mg5Zn2)相、τ(Mg32(Al,Zn)49)相组成.加入0.5%的Al5TiB可显著细化合金的铸态组织,晶粒大小由120～130μm减少到30～40μm.随着Al5TiB加入量的增加,合金的共晶α(Mg)相数量和合金的显微硬度均呈增加趋势.
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