采用光学显微镜(OM)、扫描电镜(SEM)、X射线衍射仪(XRD)和拉伸试验机研究了Si含量变化对Mg-4Al-1Zn-xSi(x=0.5,1.0,2.0,质量分数,％,下同)合金显微组织和力学性能的影响.结果表明:随着Si含量的增加,合金中的α-Mg基体组织逐渐细化;β-Mg17Al12相由点状(块状)逐渐转变为网状分布于晶界上;大量粗大的汉字状Mg2Si相沿晶界或穿晶分布.Si含量从0.5％增加到1.0％和2.0％时,α-Mg基体晶粒的平均尺寸从25μm分别细化到20μm和10 μm;汉字状Mg2 Si颗粒的平均尺寸从5 μm分别增大到10μm和100 μm;合金的硬度逐渐提高;其抗拉强度、屈服强度和伸长率先降低后升高;合金拉伸断裂形式为准解理脆性断裂.
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