摘要:
利用光学金相显微镜、扫描电镜、X射线衍射和透射电镜等研究了名义成分为Mg-8.0Gd-2.5Y-0.5Nd-2.0Zr的合金的显微组织，测试了合金的力学性能。研究表明，Mg-8.0%Gd-2.5%Y-0.5%Nd-2.0%Zr合金的铸态组织主要由α-Mg基体和主要沿晶界分布的第二相Mg5Gd和Mg24Y5组成，固溶处理后，Mg5Gd和Mg24Y5相基本消失，再经时效处理后，合金达到较好的力学性能，其室温、250℃和300℃的抗拉强度分别为312.04 MPa，271.99 MPa和199.81 MPa，其对应的延伸率分别为：3.4%，7.0%和12.7%。
Abstract:
The microstructure of magnesium alloy whose nominal composition is Mg-8.0Gd-2.5Y-0.5Nd-2.0Zr was investigated by means of optical microscopy, scanning electron microscopy, X-ray texture analysis and transmission electron microscopy, and the mechanical properties were obtained. The results show that the as-cast microstructures of Mg-8.0%Gd-2.5%Y-0.5%Nd-2.0%Zr alloy consists of α-Mg matrix and lamellar second-phase (Mg5Gd and Mg24Y5 phase) which distributes around α-Mg matrix. The Mg5Gd and Mg24Y5 phase basically disappeared after solution treatment. Then by aging treatment, alloys reach a good mechanical property. The mechanical properties of studied alloy at room temperature, 250˚C and 300˚C reach 312.04 MPa, 271.99 MPa and 199.81 MPa; the corresponding elongations are 3.4%, 7.0% and 12.7%.