研究了富铈混合稀土对挤压铸造AZ81合金的显微组织和力学性能的影响.结果表明:加入不同含量富铈混合稀土的合金中都出现了一种新相Al11(Ce,La)3相Al11(Ce,La)3相数量增多而Mg17Al12相则减少.能细化合金的组织晶粒,其细化作用在添加了1.5%富铈混合稀土的镁合金中尤为明显,但是当富铈混合稀土加入量大于2.0%时,合金中Al11(Ce,La)3相开始长大以粗大长杆状存在;在富铈混合稀土含量为1.5%时,AZ81合金的室温和150℃的综合力学性能达到最佳效果,超过2.0%时合金的室温和150℃综合力学性能开始下降;合金试样的拉伸断口带有局部韧窝的解理断裂和韧性断裂的混合特征.
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