Li含量对Mg-Li-Al-Ce-Ca系合金组织和力学性能的影响  

Effects of Li Content on Microstructure and Mechanical Properties of Mg-Li-Al-Ce-Ca Alloy

作　　者：于海侠[1] 杨云龙[1,2] 程丽任[2,3] 曹占义[2] 

机构地区：[1]吉林工业职业技术学院,吉林吉林132013 [2]吉林大学材料科学与工程学院,吉林长春130025 [3]中科院长春应化所,吉林长春130021

出　　处：《热加工工艺》2013年第10期109-111,共3页Hot Working Technology

摘　　要：采用真空电阻炉制备了Mg-Li-Al系合金。研究了Li对Mg-Li-A1系合金铸态及热处理态微观组织和力学性能的影响。结果表明:随着Li含量的增加,合金中α-Mg的量逐渐减少,当Li含量达到10.5wt%时,合金中的α-Mg相已经很难观察到;三种Mg-Li-Al系合金均由α-Mg相、β-Li相、Al2Ce、Al2Ca和MgLi2Al五种化合物或相构成;随Li含量的增加,合金屈服强度增幅近40%,而伸长率略微下降;端口呈现韧窝和撕裂棱,且撕裂棱数量随Li含量的增加而减少,为韧性断裂。Mg-Li-A1 alloy was prepared by vacuum melting method. The effects of Li content on the microstructure and mechanical properties of as-cast Mg-Li-A1 alloy were studied. The results show that the amount of α-Mg become less and less with the increase of Li addition. It is difficult to find α-Mg when Li addition is 10.5 mass%. The Mg-Li-A1 alloys with different content of Li are made of α-Mg and β-Li and Al2Ce and Al2Ca and MgLi2A1 by XRD. With the increase of Li, the yield strength and elongation increased by 40% and 23%, respectively. The number of tearing ridge becomes less and less with the increase of Li addition, which belong to gliding fracture.

关 键 词：MG-LI-AL合金 Li含量 组织 力学性能 

分 类 号：TG113.2[金属学及工艺—物理冶金]