Gd含量对Mg-xGd-1.0Y-1.0Zn-0.5Zr镁合金微观组织和力学性能的影响

Effects of Gd on Microstructure and Mechanical Properties of Mg-xGd-1.0Y-1.0Zn-0.5Zr Magnesium Alloys

通过光学金相显微镜(OM)、扫描电镜(SEM)、X射线衍射分析(XRD)、差热分析(DSC)、能谱分析(EDS)和拉伸试验研究了Gd含量对Mg-Gd-1.0Y-1.0Zn-0.5Zr镁合金微观组织和力学性能的影响。结果表明:Mg-Gd-1.0Y-1.0Zn-0.5Zr镁合金铸态微观组织主要由α-Mg、Mg5(Gd,Y)和Mg24(Y,Gd)5相组成。此外,含10.5wt%Gd的铸态合金具有最优良的力学性能,其室温抗拉强度、屈服强度和伸长率分别达到了200MPa、150MPa和5.8%。

The effect of Gd content on the microstructure and mechanical properties of Mg-Gd-1.0Y-1.0Zn-0.5Zr alloy was studied by means of OM, SEM, XRD, EDS and tensile test. The results show that the as-cast Mg-Gd- 1.0Y-1.0Zn-0.5Zr alloy is mainly composed of α-Mg, Mg5(Gd,Y) and Mg24(Y,Gd)5. In addition, the 10.5% Gd-containing alloy shows optimal mechanical properties at room temperature, and its tensile strength, yield strength and elongation reach 200 MPa, 150 MPa and 5.8%, respectively.