瞬态热变形对2195铝锂合金组织和性能的影响  

Effect of transient hot deformation on microstructure and properties of 2195 Al-Li alloy

作　　者：刘文成 黄乐亨 曾祥 李宏伟 樊晓光[3] 米忠宝[2] 徐雪峰 范玉斌[2] 危立明 LIU Wen-cheng;HUANG Le-heng;ZENG Xiang;LI Hong-wei;FAN Xiao-guang;MI Zhong-bao;XU Xue-feng;FAN Yu-bin;WEI Li-ming(Guizhou Aerospace Precision Products Co.,Ltd.,Zunyi 563006,China;School of Aeronautical Manufacturing and Mechanical Engineering,Nanchang Hangkong University,Nanchang 330063,China;Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment,Northwestern Polytechnical University,Xi′an 710072,China)

机构地区：[1]贵州航天精工制造有限公司,贵州遵义563006 [2]南昌航空大学航空制造与机械工程学院,江西南昌330063 [3]西北工业大学陕西省高性能精确成形技术与装备重点实验室,陕西西安710072

出　　处：《塑性工程学报》2024年第11期186-194,共9页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(52305372);贵州航天精工制造有限公司(GK202303076);江西省双千计划项目(001027232090);南昌航空大学博士启动项目(2030009401093)。

摘　　要：为探究瞬态热变形对2195铝锂合金组织和性能的影响,基于快速升温-大变形的方法,利用透射电镜和维氏硬度计等测试手段,对比分析了3种不同方案下2195铝锂合金的微观组织和力学性能,3种方案分别为加热保温未变形-时效处理(稳态未变形)、加热保温大变形-时效处理(稳态热变形)和加热不保温大变形-时效处理(瞬态热变形)。研究结果表明,瞬态热变形促进了时效过程中T1相(Al_(2)CuLi)和δ′相(Al_(3)Li)的析出,有利于提高2195铝锂合金的力学性能;另外,瞬态热变形过程中发生了不连续动态再结晶,其晶界处细小的析出相阻碍了晶界迁移,使得瞬态热变形试样晶粒细化显著。在相同热处理制度下,各试样的硬度大小排序为:瞬态热变形试样>稳态热变形试样>稳态未变形试样。To explore the effect of transient hot deformation on the microstructure and properties of 2195 Al-Li alloy,based on the method of quick heating up-large deformation,the microstructure and mechanical properties of 2195 Al-Li alloy were compared and analyzed under three different schemes.Three kinds of schemes are heating and holding without deformation-aging treatment(steady without deformation),heating and holding with large deformation-aging treatment(steady hot deformation)and heating and no holding with large deformation-aging treatment(transient hot deformation).The research results show that the transient hot deformation promotes the precipitation of T1 phases(Al_(2)CuLi)andδ′phases(Al_(3)Li)during aging,which is beneficial for the improvement of the mechanical properties of 2195 Al-Li alloy.In addition,discontinuous dynamic recrystallization(DDRX)occurs during transient hot deformation.The fine precipitated phases at the grain boundaries hinder the migration of grain boundary,resulting in the significant grain refinement in the transient hot deformation specimen.The order of hardness under the same heat treatment regime is:transient hot deformation specimen>steady hot deformation specimen>steady without deformation specimen.

关 键 词：2195铝锂合金 瞬态热变形 时效处理 微观组织 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]