Microstructural evolution and its effect on mechanical properties in different regions of 2219-C10S aluminum alloy TIG-welded joint  

2219-C10S铝合金TIG焊接接头各区显微组织演变及其对力学性能的影响

作　　者：Deng-kui ZHANG Ai-ping WU Yue ZHAO Ji-guo SHAN Zhan-dong WAN Guo-qing WANG Jian-ling SONG Zhong-ping ZHANG Xian-li LIU 张登魁;吴爱萍;赵玥;单际国;万占东;王国庆;宋建岭;张中平;刘宪力(清华大学机械工程系,北京100084;清华大学先进成形制造教育部重点实验室,北京100084;清华大学摩擦学国家重点实验室,北京100084;中国运载火箭技术研究院,北京100076;天津航天长征火箭制造有限公司,天津300462;首都航天机械公司,北京100076)

机构地区：[1]Department of Mechanical Engineering,Tsinghua University,Beijing 100084,China [2]Key Laboratory for Advanced Materials Processing Technology,Ministry of Education,Tsinghua University,Beijing 100084,China [3]State Key Laboratory of Tribology,Tsinghua University,Beijing 100084,China [4]China Academy of Launch Vehicle Technology,Beijing 100076,China [5]Tianjin Long March Launch Vehicle Manufacturing Co.,Ltd.,Tianjin 300462,China [6]Capital Aerospace Machinery Corporation Limited,Beijing 100076,China

出　　处：《Transactions of Nonferrous Metals Society of China》2020年第10期2625-2638,共14页中国有色金属学报（英文版）

基　　金：Project(U1637601)supported by the Joint Funds of the National Natural Science Foundation of China。

摘　　要：Microstructural evolution and its effect on mechanical properties in different regions of 2219-C10S aluminum alloy tungsten inert gas(TIG)welded joint were analyzed in detail.In weld zone(WZ),α+θeutectic structure formed at grain boundaries with no precipitates inside the grains.In partially melted zone(PMZ),symbiotic eutectic or divorced eutectic formed at grain boundaries and needle-likeθ′phases appeared in the secondary heated zone.In over aged zone(OAZ),the coarsening and dissolution ofθ′phases occurred and mostθ′phases transformed intoθphases.In general heat affected zone(HAZ),θ′phases coarsened.Factors such as the strengthening phases,the grain size,the Cu content in matrix and the dislocation density can affect the mechanical properties in different regions of the joint.Moreover,a model describing the relationship between mechanical properties of the material and the volume fraction of precipitates,the average diameter of precipitates and the concentration of soluble elements was proposed.详细分析2219-C10S铝合金TIG焊接接头各区显微组织演变及其对力学性能的影响。结果表明,在焊缝区,晶界形成α+θ共晶组织,晶内无析出相;在部分熔化区,晶界形成共生共晶或离异共晶,二次受热区晶内析出针状θ′相;在过时效区,θ′相发生粗化与溶解,大部分θ′相转化成θ相;在热影响区,θ′相发生粗化。强化相、晶粒尺寸、基体Cu含量和位错密度等因素可影响接头各区力学性能。此外,提出一种可用于描述材料力学性能与析出相体积分数、析出相平均直径、固溶元素浓度之间关系的模型。

关 键 词：2219-C10S aluminum alloy tungsten inert gas arc welding microstructural evolution mechanical properties relationship model 

分 类 号：TG457.14[金属学及工艺—焊接]