宋佩维

• 1:陕西理工学院材料科学与工程学院

摘要(Abstract)：

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10μm;汉字状Mg2Si颗粒的平均尺寸从5μm分别增大到10μm和100μm;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。

关键词(KeyWords)： Mg-4Al-1Zn-xSi合金;Si含量;显微组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 陕西省自然科学基础研究计划(2010JM6009);; 陕西省教育厅自然科学专项科研计划(2010JK470)

作者(Author): 宋佩维

DOI: 10.13289/j.issn.1009-6264.2014.08.009

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