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利用光学显微镜、扫描电镜、透射电镜、能谱仪、X射线衍射分析及力学性能测试,研究了稀土元素Er对Mg-Nd-Zn-Zr合金铸态显微组织及力学性能的影响。结果表明:在Mg-Nd-Zn-Zr合金中添加0.5wt%Er后,元素Er主要以白色小颗粒形貌分布在晶间,合金达到峰值时效的时间更短,且有大量细小的相均匀析出,时效强化效果更好;加入Er后,合金抗拉强度、屈服强度和伸长率分别达到283.4、170.2 MPa和4%;在Mg-Nd-Zn-Zr-Er合金室温拉伸断口中有高度不一的解理台、撕裂棱和少量韧窝,韧窝中的颗粒物主要含Er、Nd,说明该合金具有较好的塑性;Er的加入并没有改变合金的断裂方式,两种合金时效态都以准解理断裂为主。
The effects of rare earth element Er on the as-cast microstructure and mechanical properties of Mg-Nd-Zn-Zr alloy were investigated by optical microscope, scanning electron microscopy, transmission electron microscopy, energy dispersive spectroscopy, X-ray diffraction analysis and mechanical properties tests. The results show that the addition of 0.5wt% Er in the Mg-Nd-Zn-Zr alloy results in the distribution of the elemental Er mainly in the form of small white particles in the intergranular phase. The peak aging time of the alloy is shorter and a large number of fine phase equilibria The tensile strength, yield strength and elongation of the alloy reached 283.4,170.2 MPa and 4% respectively. In the room temperature tensile fracture of Mg-Nd-Zn-Zr-Er alloy, the tensile strength, Different cleavage table, tearing edge and a small number of dimples, dimples in the main particles containing Er, Nd, indicating that the alloy has good ductility; Er did not change the alloy fracture mode, the two alloys aging State quasi-cleavage-based fracture.