热处理对Mg-8Li-4Zn-3Y合金组织和性能的影响  

Effects of Heat-treatment on the Microstructures and Properties of Mg-8Li-4Zn-3Y Alloy

作　　者：马涛[1,2] 徐春杰[2] MA Tao;XU Chunjie(Quality Management Centre,Shaanxi Railway Institute,Weinan 714000,China;School of Materials Science and Engineering,Xi'an University of Technology,Xi'an 710048,China)

机构地区：[1]陕西铁路工程职业技术学院质量管理中心,陕西渭南714000 [2]西安理工大学材料科学与工程学院,陕西西安710048

出　　处：《铸造技术》2019年第12期1332-1336,共5页Foundry Technology

基　　金：陕西省重点研发计划（一般项目-工业领域）项目（2017GY-135）;陕西铁路工程职业技术学院2018年院级第一批科研项目（ky2018-25）

摘　　要：采用锂盐熔剂保护法熔铸Mg-8Li-4Zn-3Y合金,并对合金进行T4固溶和T6固溶+时效热处理,探讨了热处理对Mg-8Li-4Zn-3Y合金组织及硬度的影响。结果表明,T4固溶后,组织中的强化相减少,α-Mg相晶粒尺寸增大,形貌亦变得不规则,合金的硬度下降;再经过T5时效后,组织中又析出一些强化相颗粒,合金的硬度有一定程度的提高。压缩过程中,Mg-8Li-4Zn-3Y合金试样均呈鼓形后开裂,且均呈45°的剪切断裂。As-cast ingot of Mg-8Li-4Zn-3Y alloy was prepared by fused salt protection in electric-resistance furnace.T4 solid solution and T6 solid solution+aging treatment were carried out on the alloy,and the effects of heat treatment on the microstructure and hardness of Mg-8Li-4Zn-3Y alloy were discussed.The results show that after T4 solid solution,the strengthening phase in the structure decrease,the grain size of alpha-mg phase increase,the morphology become irregular,and the hardness of the alloy decrease.After T5 aging,some reinforced phase particles are precipitated in the structure,and the hardness of the alloy is improved to a certain extent.During the compression process,the Mg-8Li-4Zn-3Y alloy samples all cracked after being drum-shaped and show a shear fracture of 45°.

关 键 词：热处理 Mg-8Li-4Zn-3Y合金 组织 性能 

分 类 号：TG166[金属学及工艺—热处理]