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利用光学显微镜、扫描电子显微镜、透射电子显微镜、X-射线衍射仪、电子探针、拉伸测试仪研究Cu元素的添加对铸态ZK60镁合金显微组织和力学性能的影响,并讨论了添加Cu改善合金拉伸性能的机制。结果表明,Cu可有效消除ZK60镁合金中存在的晶内偏析,随着Cu含量的增加,合金的晶粒尺寸得到明显细化。在含Cu镁合金中,出现了一种具有面心立方结构的MgZnCu三元共晶相,该相主要富集在晶界处且在合金发生塑性变形时成为微裂纹源。拉伸实验表明,当Cu添加量为0.5%~1%时,ZK60镁合金的力学性能得到改善,当添加量达到2%时,合金的力学性能下降。
The effects of Cu addition on the microstructure and mechanical properties of as-cast ZK60 magnesium alloy were investigated by optical microscope, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, electron probe and tensile tester. Mechanism of Cu on Tensile Properties of Alloy. The results show that Cu can effectively eliminate the intragranular segregation existing in ZK60 magnesium alloy. With the increase of Cu content, the grain size of the alloy is obviously refined. In Cu-containing alloys, a ternary MgZnCu eutectic phase with a face-centered cubic structure appears, which mainly accumulates at the grain boundaries and becomes a microcrack source when the alloy is plastically deformed. Tensile tests show that the mechanical properties of ZK60 magnesium alloy are improved when the addition amount of Cu is 0.5% ~ 1%, and the mechanical properties of ZK60 magnesium alloy decrease when the addition amount reaches 2%.