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借助光学显微镜、X射线衍射仪和INSTRON拉伸机等,研究了不同Zn、Al含量对含Si的τ(Mg32(Al,Zn)49)型Mg-Zn-Al合金组织及性能的影响。结果表明,随着Zn、Al含量的增加,τ相体积分数增加,而基体α(Mg)相的体积分数下降;τ相连续程度增加,基体α(Mg)晶粒不断细化,Mg2Si颗粒略有增大。合金Mg-8Zn-3.2Al-1Si-0.3Mn-0.01P在室温或150℃下的拉伸性能相对最好,抗拉强度分别达到233 MPa和185 MPa。
The effects of Zn and Al contents on the microstructure and properties of Mg-Zn-Al alloy containing Si (Mg32 (Al, Zn) 49) were investigated by means of optical microscope, X-ray diffraction and INSTRON tensile tester. The results show that with the increase of Zn and Al contents, the volume fraction of τ phase increases, while the volume fraction of matrix α (Mg) phase decreases. The continuities of τ phase increase, the grain size of α (Mg) Have increased. The tensile properties of the alloy Mg-8Zn-3.2Al-1Si-0.3Mn-0.01P are the best at room temperature or 150 ℃, and the tensile strength reaches 233 MPa and 185 MPa respectively.