低铝含量镁-铝合金的显微组织和力学性能  

Microstructure and Mechanical Properties of Mg-Al Alloys with Low Aluminum Contents

作　　者：夏鹏举[1,2] 蒋百灵[1] 张菊梅[1] 

机构地区：[1]西安理工大学材料科学与工程学院,西安710048 [2]陕西理工学院材料科学与工程学院,汉中723003

出　　处：《机械工程材料》2011年第2期30-34,共5页Materials For Mechanical Engineering

基　　金：陕西省教育厅科学技术研究计划资助项目(07JK210)

摘　　要：采用光学显微镜、扫描电镜及其附带的能谱仪、X射线衍射仪和拉伸试验机等研究了铝质量分数小于3%的低铝含量镁-铝合金的显微组织和力学性能。结果表明:低铝含量镁-铝合金铸态组织由α-Mg和β-Mg17Al12两相组成,其中α-Mg固溶体为等轴树枝晶;随着铝含量的增加,呈六重对称的蔷薇状α-Mg树枝晶尺寸减小、分支发达;其力学性能基本随铝含量的增加而提高;铝含量为2.6%合金的抗拉强度、屈服强度和伸长率分别为178.8 MPa,62.3 MPa和11.3%。The microstructure and mechanical properties of Mg-Al alloys with aluminum contents below 3wt% were studied by means of optical microscopy,scanning electron microscopy,X-ray energy dispersive analysis,X-ray diffraction and tensile testing machine.The results show that the microstructure of as-cast Mg-Al alloys with low Al content was composed of α-Mg and β-Mg17Al12 phases.The α-Mg solid-solution was equiaxed dendrite.With the increase of Al content,the size of α-Mg dendrites with a six-fold symmetrical rosette decreased,and the branch became dispersed.Mechanical properties increased basically with the increase of Al content.The tensile strength,yield strength and elongation of the alloy with 2.6wt%Al were 178.8 MP,62.3 MPa and 11.3%,respectively.

关 键 词：镁-铝合金 低铝含量 显微组织 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]