薄板铝合金搅拌摩擦焊的组织与力学性能  

Microstructure and mechanical properties of thin aluminum alloy by friction stir welding

作　　者：刘秀如 吴厦 陈大军[2] 闫慧敏 张薇 付扬帆[2] LIU Xiuru;WU Xia;CHEN Dajun;YAN Huimin;ZHANG Wei;FU Yangfan(The Sixth Military Representative Office of the Military Representative Bureau of the Army Armament Department in Chongqing,Chongqing 400010,China;Southwest Technology and Engineering Research Institute,Chongqing 401329,China)

机构地区：[1]陆军装备部驻重庆地区军事代表局驻重庆地区第六军事代表室,重庆400010 [2]西南技术工程研究所,重庆401329

出　　处：《兵器装备工程学报》2023年第11期229-234,共6页Journal of Ordnance Equipment Engineering

摘　　要：采用单、双面焊方法对2 mm厚5052铝合金进行了搅拌摩擦焊试验,研究了接头的微观组织形貌、显微硬度、拉伸性能和断口形貌。结果表明:单、双面焊接头内部均存在“S”线,双面焊能够有效改善“S”线的分布情况,避免单面焊底部弱连接;单、双面焊焊缝截面横向硬度均呈“W”型,硬度沿厚度方向总体逐渐降低,单、双面焊沿厚度方向硬度最高分别为68.4 HV、84.2 HV,双面焊焊缝晶粒更加细化;单、双面焊平均抗拉强度分别为198、210 MPa,双面焊接头力学性能优于单面焊;通过接头断口形貌分析,单、双面焊接头断裂方式均为韧性断裂与撕裂韧性断裂混合形式。Friction stir welding test of 5052 aluminum alloy with a thickness of 2 mm is carried out by single and double side welding.The microstructure,microhardness,tensile properties and fracture morphology of the joint are studied.The results show that there are‘S’lines inside both single and double side welding joints,and double side welding could effectively improve the distribution of‘S’lines and avoid weak connections at the bottom of single side welding;The transverse microhardness of both single and double side FSW weld sections show a‘W’shape,and the microhardness gradually decreases along the thickness direction.The highest microhardness along the thickness direction is 68.4 HV and 84.2 HV for single and double side welding,respectively.The grain size of the double side welding seam is more refined;The average tensile strength of single and double side welding is 198 MPa and 210 MPa respectively,and the mechanical properties of double side welding joints are better than that of single side welding;Through the analysis of the fracture morphology of the joint,it is found that the fracture mode of both single and double welding joints is a mixture of ductile fracture and tear ductile fracture.

关 键 词：5052铝合金 搅拌摩擦焊 力学性能 微观组织 “S”线 

分 类 号：TG456.9[金属学及工艺—焊接]