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采用光学显微镜、X射线衍射、扫描电镜、硬度测试和拉伸强度测试对Mg-x Sm-0.4Zn-0.8Zr(x=2,3,4,5)镁合金进行组织观察和力学性能分析。结果表明:合金的显微组织由α-Mg基体和沿晶界分布的第二相Mg41Sm5构成,稀土Sm的加入能够细化晶粒,随着Sm含量的增加,Mg-0.4Zn-0.8Zr合金的硬度提高,当Sm含量为5%时,硬度达最大值,比ZM6镁合金提高9.2%。当Sm含量为3%时,合金抗拉强度达到最大值,比ZM6提高6.3%,当Sm含量超过3%时,抗拉强度降低。
The microstructure and mechanical properties of Mg-x Sm-0.4Zn-0.8Zr (x = 2,3,4,5) magnesium alloy were investigated by optical microscopy, X-ray diffraction, scanning electron microscopy, hardness test and tensile strength test. The results show that the microstructure of the alloy consists of α-Mg matrix and the second phase Mg41Sm5 distributed along grain boundaries. The addition of rare earth Sm can refine the grains. With the increase of Sm content, the microstructure of Mg-0.4Zn-0.8Zr alloy The hardness increases, when the Sm content is 5%, the hardness reaches the maximum, which is 9.2% higher than the ZM6 magnesium alloy. When the content of Sm is 3%, the tensile strength reaches the maximum, which is 6.3% higher than that of ZM6. When the content of Sm exceeds 3%, the tensile strength decreases.