2195铝锂合金无减薄搅拌摩擦焊组织与性能研究  

Microstructures and Mechanical Properties of Non-weld-thinning Friction StirWelded 2195 Aluminum Alloys

作　　者：王非凡 厉晓笑 马潇天 谢聿铭 黄永宪[2,3] 孟祥晨[2,3] Wang Feifan;Li Xiaoxiao;Ma Xiaotian;Xie Yuming;Huang Yongxian;Meng Xiangchen(Beijing Institute of Astronautical Systems Engineering,Beijing 100076;State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001;Zhengzhou Research Institute,Harbin Institute of Technology,Zhengzhou 450046)

机构地区：[1]北京宇航系统工程研究所,北京100076 [2]先进焊接与连接国家重点实验室,哈尔滨工业大学,哈尔滨150001 [3]郑州研究院,哈尔滨工业大学,郑州450046

出　　处：《航天制造技术》2023年第4期18-22,共5页Aerospace Manufacturing Technology

基　　金：国家自然科学基金项目(U21**004、521**301、522**350)。

摘　　要：针对传统搅拌摩擦焊焊缝减薄问题,提出了基于内、外差异轴肩结构设计的无减薄搅拌摩擦焊接方法,实现了2195铝锂合金的一次焊接二次成形焊接。结果表明,6mm厚2195-T8铝锂合金焊后接头无厚度减薄,内部无缺陷,接头抗拉强度达到395MPa,达到母材的68%,接头截面显微硬度呈“W”形分布,拉伸试样断裂于热影响区,呈45°斜角的典型韧性断裂特征。Aiming at the problem of weld thinning in conventional friction stir welding joints,non-weld-thinningfriction stir welding tool was proposed and manufactured.Two shoulders with different diameters at one side wasdesigned instead of single should of conventional friction stir welding,realizing the actions of first welding and doubleforming.The results showed that,6mm thick 2195-T8 aluminum alloy joint after welding has no obvious weld thinningand inner defects.The microhardness distribution presents W shape.The maximum tensile strength of non-weld-thinningjoints reached 395MPa,where the joint fractured at heat affected zone,presenting typical ductile fracture characteristics.

关 键 词：2195铝锂合金 无减薄 搅拌摩擦焊 微观组织 力学性能 

分 类 号：TG453[金属学及工艺—焊接] V261.34[航空宇航科学与技术—航空宇航制造工程]