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.
作者
翟传田
孙有平
李旺珍
何江美
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)
出处
《机械工程材料》
CAS
CSCD
北大核心
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)。
