Ce对Mg-Li-Al合金组织及力学性能的影响  

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

作　　者：刘滨[1] 张密林[1] 

机构地区：[1]哈尔滨工程大学材料科学与化学工程学院

出　　处：《特种铸造及有色合金》2007年第5期329-331,323,共3页Special Casting & Nonferrous Alloys

基　　金：国家高技术研究发展计划(863计划)资助项目(2006AA03Z511);黑龙江省科技攻关项目(GC06A12);哈尔滨市科技局攻关项目(2006PFXXG006)

摘　　要：研究了Ce对Mg-16Li-5Al合金铸态组织及力学性能的影响。结果表明,加入Ce后,晶粒细化,随稀土化合物Al2Ce的增加,Mg17Al12、AlLi两相减少;Ce的加入提高了合金的强度和耐热性能,大量Al2Ce的存在,易割裂基体,使强度降低;分布在晶界附近的稀土化合物改变了合金的断裂方式。The effects of Ce content on microstructure and mechanical properties of Mg-16Li-5Al alloy were investigated by OM, SEM and testing. The results show that the Ce addition results in the refinement of grain size in the alloy and the decrease of Mg12Al17 and AlLi phase due to the increase of RE compound Al2Ce. Meanwhile, its addition can improve the strength and high temperature properties, however, the amounts of Al2Ce exists in and around the grain boundary can lead to the fracture of matrix in the process of tensile, which is responsible for the deterioration of strength. The fracture characteristics of the alloy is controlled by the RE compound Al2Ce generated around the grain boundary.

关 键 词：镁锂合金 CE 显微组织 抗拉强度 

分 类 号：TG113[金属学及工艺—物理冶金]