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研究了Be和Ca元素对Mg 9Al 0 5Zn合金显微组织和力学性能的影响。结果表明 :在Mg 9Al 0 5Zn镁合金中添加 0 1Be导致合金组织粗化和力学性能下降 ,同时在晶粒内部形成粒状γ相 (Mg17Al12 )。在此基础上添加Ca可以使合金组织细化 ,且含量越高 ,细化效果越明显。Mg 9Al 0 5Zn 0 1Be 0 .5Ca合金具有较高的综合力学性能 ,但是进一步增加Ca含量导致合金常温力学性能下降。由于Al2 Ca相良好的高温强化作用 ,因此当Ca含量小于 1%时 ,Mg 9Al 0 5Zn 0 1Be XCa合金具有较高的高温强度 ,进一步增加Ca含量会增大合金脆性
The effects of Be and Ca on the microstructure and mechanical properties of Mg 9Al 0 5Zn alloy were studied. The results show that adding 0 1Be into the Mg 9 Al 0 5 Zn alloy results in the coarsening and mechanical properties of the alloy, and meanwhile forming granular γ phase (Mg17Al12) in the grain. On this basis, adding Ca can refine the alloy structure, and the higher the content, the more obvious the refining effect. Mg 9Al 0 5Zn 0 1Be 0 .5Ca alloy has high comprehensive mechanical properties, but further increase the Ca content lead to the alloy mechanical properties at room temperature decreased. Due to the good high-temperature strengthening effect of Al2 Ca phase, when Ca content is less than 1%, Mg9Al0 5Zn0 1Be XCa alloy has higher high-temperature strength, and further increase of Ca content will increase the brittleness of the alloy