超声振动对2195铝锂合金搅拌摩擦焊接头显微组织与力学性能的影响  

Effect of ultrasonic vibration on microstructures and mechanical properties of friction stir welded 2195 Al−Li alloy

作　　者：戴翔 石磊[1] 田春燕 武传松[1] 高嵩 Xiang DAI;Lei SHI;Chun-yan TIAN;Chuan-song WU;Song GAO(Key Laboratory for Liquid−Solid Structure Evolution and Processing of Materials,Ministry of Education,Shandong University,Jinan 250061,China;School of Mechanical Engineering,Qilu University of Technology(Shandong Academy of Sciences),Jinan 250353,China)

机构地区：[1]山东大学材料液固结构演变与加工教育部重点实验室,济南250061 [2]齐鲁工业大学(山东省科学院)机械工程学院,济南250353

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第1期80-93,共14页中国有色金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 51905309, 52035005, 52275349);the State Key Laboratory of Solidification Processing, China (No. SKLSP201912)。

摘　　要：采用新型超声振动强化搅拌摩擦焊对第三代2195-T6铝锂合金进行焊接,研究超声振动对接头显微组织与力学性能的影响。研究表明,超声振动强化搅拌摩擦焊能够增强塑性材料流动,进而抑制焊接缺陷,提高无缺陷接头的临界焊接速度。在保证接头抗拉强度达到母材75%的条件下,超声振动强化搅拌摩擦焊的焊接速度和效率均高于常规搅拌摩擦焊。施加超声振动能够大幅提升较高焊接速度条件下的接头力学性能。超声振动强化搅拌摩擦焊接头的极限抗拉强度为449.5 MPa,达到母材的83.1%。超声振动强化搅拌摩擦焊接能够在保证接头质量的前提下提升临界焊接速度和焊接效率。A novel ultrasonic vibration enhanced friction stir welding(UVeFSW)was employed to join the thirdgeneration 2195-T6 Al−Li alloy,and the effect of ultrasonic vibration on microstructures and mechanical properties of the joint was studied.It is revealed that UVeFSW can enhance the plastic material flow to suppress the weld defects.The critical welding speed of sound joints is increased in UVeFSW compared with conventional FSW.When ensuring that the tensile strength of the joint is 75%that of the base material,the welding speed and efficiency in UVeFSW are higher than those in conventional FSW.Superimposing ultrasonic vibration can significantly enhance the mechanical properties of 2195 Al−Li alloy FSW joints at a higher welding speed.The maximum tensile strength of the UVeFSW joint is 449.5 MPa,which is 83.1%that of the base material.UVeFSW can increase the welding efficiency by increasing the critical welding speed and simultaneously ensuring the joint properties.

关 键 词：2195-T6铝锂合金 搅拌摩擦焊 超声振动强化搅拌摩擦焊 焊接速度 晶粒结构 接头性能 

分 类 号：TG453.9[金属学及工艺—焊接] TG663