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
邵斌 1高晨曦 1王琪伟 1杨钰蝶 1宗影影 1单德彬 1郭斌1
作者信息
- 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
- 折叠
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2 μm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％.
Abstract
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 2 μm,the size of T1 phase and θ'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Key words
2A97 Al-Li alloy/thermal deformation/microstructure/texture/mechanical property引用本文复制引用
基金项目
国家自然科学基金航天联合基金(U21B2080)
出版年
2024
NETL
NSTL
维普
万方数据