2297铝锂合金中温强变形过程中组织演变及热稳定性能  

Microstructure evolution and thermal stability of 2297 aluminum-lithium alloy during warm severe plastic deformation

作　　者：何浩鹏[1] 许晓嫦[1,2] 禹灿 任鹏禾 He Haopeng;Xu Xiaochang;Yu Can;Ren Penghe(School of Materials Science and Engineering,Central South University,Changsha Hunan 410083,China;Key Laboratory of Nonferrous Metal Materials Science and Engineering,Ministry of Education,Central South University,Changsha Hunan 410083,China)

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]中南大学有色金属材料科学与工程教育部重点实验室,湖南长沙410083

出　　处：《金属热处理》2019年第2期38-44,共7页Heat Treatment of Metals

基　　金：湖南省科技攻关项目(2010K1001032-11);湖南省自然科学基金(05JJ40005)

摘　　要：对T87时效态2297铝锂合金进行中温(150℃)多向压缩直至析出相基本回溶至基体,再对其在160℃与180℃不同时间(0～48 h)条件下进行时效处理,利用透射电镜观察合金的微观组织,研究这种新型热处理工艺对2297铝锂合金组织与力学性能的影响。结果表明:时效温度为160℃时,时效48 h合金的主要析出相为δ'相,与固溶时效工艺相比,析出相析出时间延长。时效温度为180℃时,48 h合金的主要析出相为θ'相、T1相和少量δ'相。与固溶时效工艺相比,强变形固溶时效工艺增强了合金的综合力学性能。The 2297-T87 Al-Li alloy was multi-axial compressed( MAC) at 150 ℃ until the precipitated phase was almost dissolved in the matrix,and then it was aged at 160 ℃ and 180 ℃ for different time( 0-48 h). The microstructure of the alloy was observed by transmission electron microscopy to investigate the effects of this new heat treatment process on microstructure and mechanical properties of the 2297 Al-Li alloy. The results show that when the aging temperature is 160 ℃ and aging time is 48 h,the main precipitated phase of the alloy is δ’phase,and the precipitation time of the precipitate is longer than that of the solution-aging process. When the aging temperature is 180 ℃and the aging time is 48 h,the main precipitated phases of the alloy are θ’ phase,T1 phase and a small amount of δ’ phase. Compared with the solid solution-aging process,the severe deformation solution aging process enhances the comprehensive mechanical properties of the alloy.

关 键 词：铝锂合金 强塑性变形 时效 微观组织 热稳定性能 

分 类 号：TG156.9[金属学及工艺—热处理]