Mg-12Gd-Sm-0.5Zr合金的组织和力学性能

Microstructure and mechanical properties of Mg-12Gd-Sm-0.5Zr alloy

采用重稀土Gd和轻稀土Sm代替WE系列中的Y和Nd等稀土元素,设计开发了Mg-Gd-Sm-Zr系高性能镁合金。利用XRD、OM、SEM、EDS及拉伸试验,研究了Mg-12Gd-Sm-0.5Zr合金的微观组织、室温和高温力学特性。结果表明:合金由α-Mg基体、Mg5Gd相和Mg41Sm5相组成;在室温到300℃范围内合金的抗拉强度较稳定,室温抗拉强度为238 MPa,200、250、300℃分别为263、266、256 MPa,合金在该温度范围内具有抗拉强度的温度效应。

The high performance magnesium alloys of Mg-Gd-Sm-Zr series were prepared with heavy rare earth Gd and light rare earth Sm instead of rare earth Y and Nd of WE series respectively. The microstructure and the mechanical behaviors of Mg-12Gd-Sm-0.5Zr alloyat room temperature and high temperature were investigated by XRD,OM,SEM,EDS and tensile test. The results show that the microstructure of the alloy includesα-Mg matrix,and Mg5Gd and Mg41Sm5 phase. The properties of the alloy are stable from room temperature to the high temperature of 300℃,the tensile strength at room temperature is 238 MPa,and the tensile strength of the alloy at 200,250,300℃reaches 263,266,256 MPa respectively. The temperature effect of the tensile strength exists in the alloy within a certain temperature range.