Mg-Li合金的性能研究  

Research on properties of Mg-Li alloys

作　　者：石继红[1] 沙桂英[1] 于涛[1] 张利[1] 宋广胜[1] 

机构地区：[1]沈阳航空工业学院材料系,辽宁沈阳110034

出　　处：《轻合金加工技术》2007年第9期42-44,57,共4页Light Alloy Fabrication Technology

基　　金：航空科学基金项目(2001102004)

摘　　要：根据Mg-Li二元合金相图设计了三种Li含量的Mg-Li合金。这三种合金分别具有α单相、α+β共晶和β单相组织。对三种合金分别进行了拉伸、冲击试验和断口分析。结果表明:Mg-3.5Li(α相)合金有最高的抗拉强度和最低的塑性及韧性,拉伸和冲击断口主要呈脆性断裂特征;Mg-8Li(α+β共晶)合金有最好的屈服强度、塑性和韧性,拉伸和冲击断口主要呈韧性断裂特征。Three kinds of Mg-Li alloys with different Li content have been designed according to Mg-Li alloy phase diagram. They exhibit three different microstructures （α single phase,α＋β dual phase and β single phase）. Tensile test,impact test have been carried out for the three alloys. Fracture surfaces have been analyzed by SEM. It was found that tensile strength of Mg-3.5Li alloy is the highest, plasticity and toughness are the worst, and fracture surface presents brittleness fracture characteristic. It was in addition found that yield strength of Mg-8Li alloy is highest, plasticity and toughness are best, and fracture surface presents ductibility fracture characteristic.

关 键 词：MG-LI合金 显微组织 拉伸试验 冲击试验 断口 

分 类 号：TG115.5[金属学及工艺—物理冶金]