Microstructure,Corrosion and Mechanical Properties of Medium-Thick 6061-T6 Alloy/T2 Pure Cu Dissimilar Joints Produced by Double Side Friction Stir Z Shape Lap-Butt Welding  

作　　者：Jiuxing Tang Guoxin Dai Lei Shi Chuansong Wu Sergey Mironov Surendra Kumar Patel Song Gao Mingxiao Wu 

机构地区：[1]MOE Key Lab for Liquid-Solid Structure Evolution and Materials Processing,Shandong University,Jinan 250061,China [2]Laboratory of Mechanical Properties of Nanoscale Materials and Superalloys,Belgorod State University,Belgorod 308015,Russia [3]School of Mechanical Engineering,Qilu University of Technology(Shandong Academy of Sciences),Jinan 250353,China [4]State Grid Henan Electric Power Research Institute,Zhengzhou 450052,China

出　　处：《Chinese Journal of Mechanical Engineering》2024年第2期385-400,共16页中国机械工程学报（英文版）

基　　金：Supported by National Natural Science Foundation of China(Grant Nos.52275349,52035005);Key Research and Development Program of Shandong Province of China(Grant No.2021ZLGX01);Qilu Young Scholar Program of Shandong University of China.

摘　　要：A novel double side friction stir Z shape lap-butt welding(DS-FSZW)process was proposed to achieve excellent mechanical properties of Al/Cu medium-thick dissimilar joints.The influence of welding parameters on weld microstructure and properties of DS-FSZW joint were systematically investigated.It indicated that defect-free medium-thick Al/Cu DS-FSZW joint could be achieved under an optimal welding parameter.DS-FSZW joint was prone to form void defects in the bottom of the second-pass weld.The recrystallization mechanisms at the top and middle of the weld nugget zone(WNZ)were continuous dynamic recrystallization(CDRX)and geometric dynamic recrystallization(GDRX).While the major recrystallization mechanism at the bottom of the WNZ was GDRX.DS-FSZW joint of the optimal welding condition with 850 r/min-400 mm/min was produced with a continuous thin and crack-free IMCs layer at the Al/Cu interface,and the maximum tensile strength of this joint is 160.57 MPa,which is equivalent to 65.54%of pure Cu base material.Moreover,the corrosion resistance of Al/Cu DS-FSZW joints also achieved its maximum value at the optimal welding parameter of 850 r/min-400 mm/min.It demonstrates that the DS-FSZW process can simultaneously produce medium-thick Al/Cu joints with excellent mechanical performance and corrosion resistance.

关 键 词：DS-FSZW Al/Cu dissimilar joint Corrosion behaviour Intermetallic compounds MICROSTRUCTURE Mechanical properties 

分 类 号：TG453.9[金属学及工艺—焊接]