钇含量对Mg-Y合金组织及力学性能的影响  

Effect of yttrium content on microstructure and mechanical properties of Mg-Y alloys

作　　者：田爽 张诗昌[1,2] 熊九郎 张健[1] TIAN Shuang;ZHANG Shi-chang;XIONG Jiu-lang;ZHANG Jian(School of Materials and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China;Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,WuhanUniversity of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学材料与冶金学院,湖北武汉430081 [2]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081

出　　处：《轻合金加工技术》2018年第9期49-53,共5页Light Alloy Fabrication Technology

基　　金：武汉科技大学国防预研基金项目(GF201710)

摘　　要：研究了钇(Y)含量对金属型铸造Mg-Y合金铸态组织、力学性能以及压缩变形织构的影响。结果表明:Y可以细化Mg-Y合金组织,当钇含量由w(Y)=0增加到w(Y)=3%时,合金的平均晶粒尺寸由300μm减小到55μm;随着钇含量增加,共晶相增加,并产生Mg24Y5第二相粒子; Y可以提高Mg-Y合金室温下的硬度和抗压强度,尤其能显著提高Mg-Y合金高温抗压强度;随着钇含量的增加,基面织构强度由纯镁的9. 1降至Mg-3%Y合金的3. 3。并探讨了Y弱化Mg-Y合金基面织构的机制。The as-cast microstructure,mechanical properties and compression deformation texture of metal mould casting Mg-Y alloys were investigated with different contents of yttrium. The results show that Y can refine the microstructure of Mg-Y alloy. When the content of yttrium increases from w（ Y） = 0 to w（ Y） = 3%,the average grain size decreases from300 μm to 55 μm. With the increase of Y content,the eutectic phase increases and the second phase Mg24 Y5 particles appear. Y can improve the hardness and compressive strength of Mg-Y alloy at room temperature,especially the compressive strength at high temperature.With the increase of Y content,the intensity of basal texture is reduced from 9. 1 of pure magnesium to 3. 3 of Mg-3% Y alloy. The mechanism of weakening basal texture by Y was discussed as well.

关 键 词：Mg-Y合金 铸态组织 织构 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]