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中文摘要：
通过真空感应熔炼技术制备出不同Cu含量的AZ61镁合金,采用光学显微镜（OM）、X射线衍射（XRD）、差热分析（DSC）、扫描电镜（SEM）和能谱分析（EDS）等方法研究了Cu元素对合金组织和力学性能的影响。结果表明：Cu元素以三元AlCuMg相存在于合金中,主要分布在晶界处及枝晶间;添加Cu元素后能够细化合金铸态组织,并使β-Mg17Al12相数量减少、尺寸变细;随着Cu含量增加,挤压态合金强度先上升后下降,而延伸率只有当Cu含量达到1%时才开始显著下降。其中AZ61-1Cu具有最佳的综合力学性能,屈服强度、抗拉强度和延伸率分别为230 MPa、321 MPa和9.7%;当Cu含量为1.5%时,粗大的AlCuMg相割裂了合金基体,使合金力学性能下降。
英文摘要：
Microstructures and mechanical properties of AZ61 with Cu addition are investigated by optical microscope（OM）,X-ray diffraction analysis（XRD）,differential thermal analysis（DSC）,scanning electron microscopy（SEM） and energy spectrum analysis（EDS）.The results show that some ternary AlCuMg phases are observed along the grain boundaries and between dendrites in AZ61-xCu alloys,and they can refine the microstructure of as-cast alloys.Meanwhile,with the addition of Cu,the quantity and the size of β-Mg17Al12 decrease.As Cu content increasing,the strength of as-extruded alloys increase first and then decrease.The elongation has no obvious decrease until Cu content reaches 1.5%.AZ61-1Cu alloy has optimum combination mechanical properties,with σ0.2=230 MPa,σb=321 MPa and δ=9.7%,respectively.When Cu content is 1.5%,the coarse AlCuMg phase splits the matrix and deteriorates mechanical properties.
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