四川大学学报（自然科学版）2025，Vol.62Issue(4)：793-802,10.DOI:10.19907/j.0490-6756.240332
Sn3Y5增强相对轨道交通用镁合金高温流变行为影响的研究
Effect of Sn3Y5 on high temperature flow behavior of magnesium alloy in rail transit
摘要
Abstract
As the lightest metal structural material,magnesium(Mg)alloy has great application potential in the lightweight field of rail transportation.Its poor elevated-temperature mechanical properties however limit the further wide applications.Sn3Y5 phase is characteristic of well-mismatched crystallographic orientation re-lationships with the Mg matrix and displays second phase strengthening in the process of elevated-temperature deformation,which shows significant effect on the creep resistance of Mg alloy.In the present study,the hot compression experiments,with strain rate 10-4～10-1 s-1,compression amount 40%and deformation tem-perature 250～400℃,were carried out on the pure Mg,Mg-0.5Sn3Y5 and Mg-2.0Sn3Y5(wt.%)casting al-loys.The true stress-strain compression curves,constitutive equations and machining diagram according to DMM model were obtained.The results show that increasing the deformation temperature and decreasing the strain rate are beneficial to enhance the dynamic recrystallization of magnesium alloy.At 350～400℃,high-content Sn3Y5 promotes the dynamic recrystallization in Mg-Sn-Y based alloy.Accordingly,the constitutive equation of Mg-0.5Sn3Y5 alloy is obtained as ε̇=2.786×108[sinh(0.02006σ)]4.1918exp(-149 160/RT).The plastic processing temperature decreases and strain rate increases with the increase of Sn3Y5 content.关键词
镁合金/Sn3Y5/高温流变行为Key words
Mg alloy/Sn3Y5/Elevated-temperature flow behavior分类
矿业与冶金引用本文复制引用
刘东宇,徐世伟,钱晓英,魏秋实,杨秋荣,曾迎..Sn3Y5增强相对轨道交通用镁合金高温流变行为影响的研究[J].四川大学学报（自然科学版）,2025,62(4):793-802,10.基金项目
湖南大学整车先进设计制造技术全国重点实验室开放基金(82315003) （82315003）
国家自然科学基金面上项目(52374405) （52374405）
