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采用光学显微镜、X射线衍射仪(XRD)、扫描电镜(SEM)和力学试验等研究了Mg-10Er-2Zn-0.6Zr合金的组织和力学性能。结果表明,铸态Mg-10Er-2Zn-0.6Zr合金主要由树枝状α-Mg基体以及分布于枝晶间的长周期结构相和Mg_3(Er,Zn)相组成;合金经过500℃×20h固溶后,铸态合金中LPSO相和Mg_3(Er,Zn)相消失,而在晶界处生成WMg_3Er_2Zn_3相;随后炉冷至400℃,α-Mg晶内析出呈平行排列且贯穿晶粒的条纹状LPSO相结构。拉伸条件下,固溶态合金具有最佳的力学性能,其屈服强度、抗拉强度和伸长率分别为117 MPa、227 MPa、17.9%。与拉伸性能相比,压缩条件下合金表现出更优的力学性能。
The microstructure and mechanical properties of Mg-10Er-2Zn-0.6Zr alloy were studied by optical microscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM) and mechanical tests. The results show that the as-cast Mg-10Er-2Zn-0.6Zr alloy is mainly composed of dendritic α-Mg matrix and long-period structure phase and Mg_3 (Er, Zn) phase distributed between dendrites. After dissolution, the LPSO phase and the Mg_3 (Er, Zn) phase disappear in the as-cast alloy and the WMg_3Er_2Zn_3 phase is formed at the grain boundary. After cooling to 400 ° C, the α-Mg precipitates in parallel and runs through the crystal grain Like LPSO phase structure. Tensile conditions, the solid solution alloy has the best mechanical properties, the yield strength, tensile strength and elongation were 117 MPa, 227 MPa, 17.9%. Compared with the tensile properties, the alloys show better mechanical properties under compression.