下压力对铝/镁搅拌摩擦焊接头组织与性能的影响  

Effect of Z-Axial Force on Microstructure and Mechanical Property of Al/Mg Dissimilar Friction Stir Welded Joint

作　　者：张真 付雪松 陈吉 陈科[1] ZHANG Zhen;FU Xuesong;CHEN Ji;CHEN Ke(School of Material Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Shanghai Tuopu Numerical Control Technology Co” Ltd” Shanghai 201100,China)

机构地区：[1]上海交通大学材料科学与工程学院,上海200240 [2]上海拓璞数控科技有限公司,上海201100

出　　处：《航空制造技术》2019年第12期22-27,共6页Aeronautical Manufacturing Technology

基　　金：国家自然科学基金(51204108);教育部博士点新教师基金(20120073120120)

摘　　要：通过改变铝/镁搅拌摩擦焊接下压力,对6061–T6铝合金和AZ31镁合金板材进行对接焊,表征了接头宏微观组织结构,研究了组织结构与接头性能的关系。研究结果表明:当下压力为28kN时,得到最高168MPa的接头强度,此时铝/镁界面处金属间化合物层最薄,同时剧烈混合区内未出现无规则形貌的金属间化合物;随着下压力的增大,接头的力学性能呈现降低的趋势;下压力增大,使得搅拌头与待焊材料的摩擦产热升高,提高了焊接过程的热输入,使得铝/镁界面靠近底部金属间化合物层变厚且剧烈混合区内出现多相共存的混杂结构,同时界面偏上部出现形似孔洞的缺陷,降低接头性能。The influence of microstructure on the mechanical properties of 6061-T6 aluminum alloy and AZ31 magnesium alloy FSW joints was studied by changing Z-axial force.The results show that,when the Z-axial force is 28kN,the ultimate tensile strength of Al/Mg joints can reach 168MPa.The intermetallic compound layer at the interface is the thinnest,and there are no irregular intermetallic compounds in the severely deformed zone;The mechanical properties of the joints decrease with the increase of Z-axial force.With the increase of Z-axial force,the heat input in the welding process increases,resulting in thickening of intermetallic compound layer at the interface,the irregular structure appears in severely deformed zone and the hole-like defect appears at the upper part of the interface,which reduce the strength of the joints.

关 键 词：搅拌摩擦焊 6061铝合金 AZ31镁合金 力学性能 组织结构 

分 类 号：TG453.9[金属学及工艺—焊接]