焊接速度对铝/镁异种合金搅拌摩擦焊竖向压力、组织和性能的影响  

Effect of Welding Speed on Vertical Pressure,Microstructure and Properties of Al/Mg Dissimilar Metals Friction Stir Welding

作　　者：赵亚东 路尧文[1,2] 崔红保 郭学锋[1] 王曙光[2] ZHAO Yadong;LU Yaowen;CUI Hongbao;GUO Xuefeng;WANG Shuguang(School of Materials Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China;School of Mechanical Engineering,Anyang Institute of Technology,Anyang 455000,China;Anyang Key Laboratory of Advanced Aeronautical Materials and Processing Technology,Anyang Institute of Technology,Anyang 455000,China)

机构地区：[1]河南理工大学材料科学与工程学院,河南焦作454000 [2]安阳工学院机械工程学院,河南安阳455000 [3]安阳工学院安阳市先进航空材料与加工技术重点实验室,河南安阳455000

出　　处：《热加工工艺》2023年第13期42-46,56,共6页Hot Working Technology

基　　金：河南省科技计划项目(182102210019);河南省高等学校青年骨干教师培养计划项目(2020GGJS236);安阳工学院博士后创新实践基地启动经费项目(BHJ2019005);河南省博士后科研启动项目(HNBH223104)。

摘　　要：对1060铝和AZ31B镁合金进行了铝/镁异种搅拌摩擦对接焊试验,采用三分量切削力测试系统研究了不同焊接速度下的竖向压力。采用电子万能试验机进行了接头拉伸性能测试,使用光学显微镜、扫描电子显微镜分别观察了接头组织和拉伸断口形貌。结果表明,焊接速度变化引起竖向压力变化,而该压力对焊缝表面成形具有重要的影响,当焊接速度为110 mm/min时,竖向压力波动小,焊缝表面成形良好。焊接速度对接头的材料流动和晶粒尺寸也有重要影响,焊接速度为110 mm/min时,接头焊核区铝/镁界面组织具有良好的机械互锁效应,晶粒细小且均匀。随着焊接速度增加,接头抗拉强度和伸长率先升高后降低,在焊接速度为110 mm/min时接头力学性能最好,抗拉强度和伸长率分别为96.5 MPa和4.2%,断裂方式为脆韧混合断裂。The friction stir butt welding of 1060 aluminum and AZ31B magnesium alloy was carried out.The vertical pressure at different welding speeds was studied by using three-component cutting force test system.The tensile properties of the joints were tested by electronic universal testing machine.The microstructure of the joints and the tensile fracture morphology were observed by using optical microscope and scanning electron microscope respectively.The results show that the change of welding speed causes the vertical pressure change.However,the vertical pressure has an important influence on the weld surface forming,when the welding speed is 110 mm/min,the vertical pressure fluctuation is small,and the weld surface forming is good.The welding speed also has an important influence on the material flow and grain size of the joint,when the welding speed is 110 mm/min,the microstructure of Al/Mg interface in nugget zone has good mechanical interlocking effect,and the grains are fine and uniform.With the increase of welding speed,the tensile strength and elongation of the joint first increase and then decrease.When the welding speed is 110 mm/min,the mechanical properties of the joint are the best,the tensile strength and elongation are 96.5 MPa and 4.2%respectively,and the fracture mode is brittle and ductile mixed fracture.

关 键 词：铝/镁异种合金 搅拌摩擦焊 竖向压力 组织 力学性能 

分 类 号：TG453.9[金属学及工艺—焊接]