Microstructure and mechanical properties of stationary shoulder friction stir welding joint of 2A14-T62 aluminum alloy  

作　　者：邓建峰 王博 王生希 郭伟强 黄智恒 费文潘 Deng Jianfeng;Wang Bo;Wang Shengxi;Guo Weiqiang;Huang Zhiheng;Fei Wenpan(China Academy of Machinery Ningbo Academy of Intelligent Machine Tool Co.,Ltd.,Ningbo,315700,China;Aerospace Engineering Equipment(Suzhou)Co.,Ltd.,Suzhou,215100,China)

机构地区：[1]China Academy of Machinery Ningbo Academy of Intelligent Machine Tool Co.,Ltd.,Ningbo,315700,China [2]Aerospace Engineering Equipment(Suzhou)Co.,Ltd.,Suzhou,215100,China

出　　处：《China Welding》2024年第2期31-38,共8页中国焊接（英文版）

基　　金：supported by the Research and Development Project of“Jianbing”in Zhejiang Province(2024C01085);Natural Science and Foundation of Ningbo(2022J052).

摘　　要：2A14-T62 butt joint was successfully welded by stationary shoulder friction stir welding(SSFSW)method.The results showed that using a pin with small shoulder could broaden the process window,and under a rotation speed of 2000 r/min and welding speed of 30 mm/min,joint with smooth surface,small reduction in thickness and little inner defects was obtained.The weld nugget zone was approx-imately circular,which was a unique morphology for SSFSW.The heat-affected zone(HAZ)and thermo-mechanically affected zone(TMAZ)were both quite narrow due to the lower heat input and slight mechanical action of the stationary shoulder.The fraction of high angle grain boundaries(HAGBs)exhibited a“W”shape along horizontal direction(from advancing side to retreating side),and the minim-um value located at HAZ.The average ultimate tensile strength and elongation of the joint were 325 MPa and 4.5%,respectively,with the joint efficiency of 68.3%.The joint was ductile fractured and the fracture surface contained two types of dimples morphology in different re-gions of the joint.Microhardness distribution in the joint exhibited a“W”shape,and the difference along the thickness direction was negli-gible.The joint had strong stress corrosion cracking susceptibility,and the slow stain rate tensile strength was 139 MPa.Microcrack and Al2O3 particulates were observed at the fracture surface.

关 键 词：2A14-T62 aluminum alloy stationary shoulder friction stir welding microstructure mechanical property stress corrosion cracking 

分 类 号：TG453.9[金属学及工艺—焊接]