利用SEM、X射线衍射等手段研究了微量元素Ce和Sb及时效处理对Mg-Al-Zn系铸造合金组织和性能的影响.结果表明:Ce和Sb元素显著地细化了试验合金铸态组织,改善B相形貌及分布,并形成呈粒状弥散分布Mg_3SB_2、Al_(11)Ce_3、CeCu_6的新相;Mg-10Zn-2Al-1Cu+0.5%(Ce+Sb)试验合金的时效沉淀过程中弥散析出粒状、杆状析出相(Mg_(32)(Al,Zn)_(49)、Mg_(32)Al_(47)Cu_7、Mg_3ZN_2、Mg_3SB_2、CeCu_6等),且其析出相的形成、析出速度和长大速度等都远远小于AZ91D合金,显示较好的时效强化效应.
Effects of addition of Ce and Sb and aging treatment on microstructure and mechanical properties of Mg-Zn-Al casting magnesium alloy were studied by SEM and XRD. The results show that the addition of Ce and Sb results in grain refinement of the as-cast Mg-Zn-Al alloy and improves the morphology and distribution of β-phase,and granular phasea of Mg_3SB_2 ,Al_(11)Ce_3 and CeCu_6 dispersively distributed in the alloy are observed. The precipitation process of Mg-10Zn-2Al-1Cu alloy containing 0. 5% Ce and 0.5% Sb during aging is as follows : supersaturated solid solution(SSSS)→precipitation of granular,disciform and rod-shaped phases of Mg_(32) (Al,Zn)_(49) ,Mg_(32) Al_(47)Cu_7 ,Mg_3ZN_2 ,Mg_3SB_2 ,and CeCu_6. The precipitation process of Mg-10Zn-2Al-1Cu alloy is much slower than that of AZ91D alloy.
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