均匀化退火对Mg-4Zn-4Y合金显微组织和力学性能的影响  

Effect of Homogenization Annealing on Microstructure and Mechanical Properties of Mg-4Zn-4Y Alloy

作　　者：翟传田 孙有平[1,2,3] 李旺珍[1,2,3] 何江美[1] 万斯雨 ZHAI Chuantian;SUN Youping;LI Wangzhen;HE Jiangmei;WAN Siyu(School of Mechanical and Transportation Engineering,Guangxi University of Science and Technology,Liuzhou 545006,China;Guangxi Earthmoving Machinery Collaborative Innovation Center,Guangxi University of Science and Technology,Liuzhou 545006,China;Guangxi Key Laboratory of Automobile Components and Vehicle Technology,Guangxi University of Science and Technology,Liuzhou 545006,China)

机构地区：[1]广西科技大学机械与交通工程学院,柳州545006 [2]广西科技大学广西土方机械协同创新中心,柳州545006 [3]广西科技大学广西汽车零部件与整车技术重点实验室,柳州545006

出　　处：《机械工程材料》2023年第1期26-33,共8页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(51864006);广西高等学校高水平创新团队资助项目(桂教师范[2019]52号);广西自然科学基金资助项目(2018GXNSFBA281195);广西科技大学研究生教育创新计划项目(GKYC202110)。

摘　　要：对铸态Mg-4Zn-4Y合金进行了不同温度(440,460,480℃)和不同保温时间(4~24 h)下的均匀化退火,研究了均匀化退火对合金组织及性能的影响。结果表明:铸态合金中存在α-Mg相、W相Mg_(3)Zn_(3)Y_(2)、LPSO相Mg_(12)ZnY和富钇相;随着退火温度的升高,大部分LPSO相逐渐溶入基体;随着退火保温时间的延长及退火温度的升高,富钇相含量减少,枝晶偏析得到改善;与铸态合金相比,440,460℃均匀化退火后合金的抗拉强度略微降低,断后伸长率变化较小,480℃均匀化退火后抗拉强度和断后伸长率较高,但出现烧损现象。该合金的最佳均匀化退火制度为440℃×12 h。As-cast Mg-4Zn-4Y alloy was treated by homogenization annealing at different temperatures(440,460,480℃)for different holding times(4-24 h),and the effects of homogenization annealing on the microstructure and properties of the alloy were studied.The results show that there wereα-Mg phase,W phase Mg_(3)Zn_(3)Y_(2),LPSO phase Mg_(12)ZnY and yttrium-rich phase in the as-cast alloy.With increasing annealing temperature,most of the LPSO phase gradually dissolved into the matrix.With increasing annealing temperature and holding time,the content of yttrium-rich phase decreased,and the dendrite segregation was reduced.Compared with the as-cast alloy,the tensile strength of the alloy after homogenization annealing at 440℃and 460℃decreased slightly,and the percentage elongation after fracture changed slightly.The tensile strength and percentage elongation after fracture after homogenization annealing at 480℃were relatively high,but the burning loss occurred.The best homogenization annealing of the alloy was 440℃×12 h.

关 键 词：MG-ZN-Y合金 均匀化退火 显微组织 拉伸性能 

分 类 号：TG166.4[金属学及工艺—热处理]