热变形对2A97铝锂合金板材组织均匀性和力学性能的影响  

Effect of thermal deformation on microstructure uniformity and mechanical properties of 2A97 Al-Li alloy sheet

作　　者：邵斌 高晨曦 王琪伟 杨钰蝶 宗影影[1] 单德彬[1] 郭斌[1] SHAO Bin;GAO Chen-xi;WANG Qi-wei;YANG Yu-die;ZONG Ying-ying;SHAN De-bin;GUO Bin(National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]哈尔滨工业大学金属精密热加工国家级重点实验室,黑龙江哈尔滨150001

出　　处：《塑性工程学报》2024年第4期169-177,共9页Journal of Plasticity Engineering

基　　金：国家自然科学基金航天联合基金资助项目(U21B2080)。

摘　　要：针对2A97铝锂合金组织不均匀导致的性能差异,通过热塑性变形来改善2A97铝锂合金的组织均匀性,并进一步提升其力学性能。采用单向压缩的方法,变形量选择30%和60%,变形温度为400℃,固溶参数为520℃、1 h,时效参数为165℃、50 h。结果显示,热变形能够显著改善2A97铝锂合金晶粒尺寸的均匀性,抑制固溶时织构的产生。60%变形量能够打碎原始组织中的大块共晶相和针状析出相,提高固溶程度,促进再结晶过程,产生大量平均晶粒尺寸为2μm的再结晶晶粒,时效后析出的T1相与θ′相尺寸较小且密集,2A97铝锂合金的极限抗拉应力达到510 MPa,相比单纯固溶时效提高了11.8%。Aiming at the difference of properties caused by the microstructure inhomogeneity of 2A97 Al-Li alloy,the microstructure uni-formity of 2A97 Al-Li alloy were improved by thermoplastic deformation and its mechanical properties were further improved.The unidi-rectional compression method was adopted,the deformation amount was selected as 30%and 60%,the deformation temperature was 400℃,the solution parameters were 520℃for 1 h,and the aging parameters were 165℃for 50 h.The results show that thermoplastic deformation can significantly improve the microstructure uniformity of 2A97 Al-Li alloy and inhibit the texture formation during solu-tion.The deformation of 60%can break the bulk eutectic phase and acicular precipitated phase in the original structure,improve the de-gree of solid solution,promote the recrystallization process,produce a large number of recrystallized average with grain size of 2μm,the size of T1 phase andθ′phase precipitated after aging is large and dense,and the ultimate tensile stress of 2A97 Al-Li alloy reaches 510 MPa,which increases by 11.8%compared with simple solid solution aging.

关 键 词：2A97铝锂合金 热变形 微观组织 织构 力学性能 

分 类 号：TG301[金属学及工艺—金属压力加工]