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°.
作者
马涛
徐春杰
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)
出处
《铸造技术》
CAS
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）
