在AE41镁合金中添加质量分数0.8%Ca及0.2%～0.8%Si,制得了不同成分的镁合金,采用光学显微镜、X射线衍射仪、扫描电镜及能谱仪和压入蠕变试验设备等研究了钙和不同硅含量对AEA1镁合金的压入蠕变性能和显微组织的影响.结果表明:加入钙可提高AE41合金的蠕变性能,再添加硅可进一步提高其蠕变性能,且蠕变性能随硅含量的增加而升高;AE41合金中的析出相主要为杆状Al11Nd3相和少量颗粒状Al2Nd相,加入钙后有骨骼状Al2Ca析出,且Al2Nd相析出增多;再加入硅后,合金中有汉字状Mg2Si相和较复杂的相析出,且随硅含量的增加,杆状、短杆状和颗粒状相增多;蠕变后,AE41合金中颗粒状Al2Nd相增多,添加钙的合金无新相析出,但Al2Ca相减少,添加钙和硅的合金中骨骼状相减少,但短杆状和颗粒状相增多.
AE41 magnesium alloys with different chemical compositions were prepared by adding 0.8%Ca and 0.2%-0.8%Si. The effects of Ca and different Si contents on the indention creep and microstructure of AE41magnesium alloys were investigated by using OM, XRD, SEM, EDS and indentation creep testing. The results show that the creep property of AE41 alloy was improved by adding Ca, and improved further by adding Si, and the creep property of the alloys increased with the increase of Si content. The precipitated phases of AE41 magnesium alloy were rod phase Al11Nd3 and granular phase Al2Nd. There was bone phase Al2Ca precipitated after adding Ca, and the content of Al2Nd increased. Chinese script phase Mg2Si and complicated phases of the magnesium alloysappeared after further adding Si. The contents of rod, short-rod and particle phases increased with the increase of Si. The content of granular phase Al2 Nd of AE41 alloy increased after creep, no new phase precipitated in the alloy contained Ca, but the content of Al2Ca decreased. The content of bone phase in the alloys containing Ca and Si decreased but the short-rod and particle phases increased during the creep deformation.
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