Y含量对Mg-Gd-Y合金组织和性能的影响  

Effect of Y content on microstructure and properties of Mg-Gd-Y alloy

作　　者：李旭东 宁江利 李杰 LI Xu-dong;NING Jiang-li;LI Jie(School of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063000,China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063000

出　　处：《轻合金加工技术》2021年第3期14-18,48,共6页Light Alloy Fabrication Technology

基　　金：国防基础科研计划项目(JCKY2018407C008);华北理工大学杰出青年基金(JQ201702)。

摘　　要：研究了稀土元素Y含量对Mg-8Gd合金组织和性能的影响,制备了Mg-8Gd-3Y和Mg-8Gd-7Y两个合金。对两合金的铸态、固溶态和热轧变形态的微观组织进行观察,测试了固溶处理后和热变形后的室温拉伸性能。结果表明:Y含量对Mg-8Gd合金的铸态微观组织无明显影响。经固溶处理后,枝晶偏析被全部消除,Mg-8Gd-7Y合金中有Mg5(Gd,Y)第二相粒子析出,并且出现了粗大的富Y第二相。Mg-8Gd-3Y合金中有Mg3(Gd,Y)第二相粒子析出。室温拉伸试验发现,固溶态和热轧态Mg-8Gd-7Y合金的屈服强度和抗拉强度均高于Mg-8Gd-3Y合金的,但前者的伸长率低于后者的,其原因是高Y含量合金组织中的粗大富Y第二相粒子对塑性变形产生不利影响。The effect of rare earth element Y content on the microstructure and properties of Mg-8Gd alloy was studied.Two alloys of Mg-8Gd-3Y and Mg-8Gd-7Y were prepared.The microstructures of as-cast,as-solution and hot-rolled alloys were observed,and the tensile properties at room temperature after solution treatment and hot deformation were tested.The results show that Y content has no obvious effect on the as-cast microstructure of Mg-8Gd alloy.After solution treatment,the dendrite segregation is completely eliminated.In Mg-8Gd-7Y alloy,Mg5(G d,Y)second phase particles precipitate,and coarse Y-rich second phase appears.The second phase particles of Mg3(G d,Y)precipitate in Mg-8Gd-3Y alloy.It is found after room temperature tensile tests that yield strength and tensile strength of assolution and hot-rolled Mg-8Gd-7Y alloys are higher than those of Mg-8Gd-3Y alloys.However,the elongation of the former is lower than that of the latter.The reason is that the coarse Y-rich second phase particles in the alloy microstructure with high Y content have adverse effects on the plastic deformation.

关 键 词：MG-GD-Y合金 热处理 热轧 组织 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]