钛/铝异种金属搅拌摩擦焊搭接接头的组织结构  

Microstructure of Ti/Al dissimilar alloys lap joint made by friction stir welding

作　　者：陈玉华[1] 倪泉[1] 黄春平[1] 柯黎明[1] 

机构地区：[1]南昌航空大学轻合金加工科学与技术国防重点学科实验室,南昌330063

出　　处：《焊接学报》2011年第9期73-76,116-117,共4页Transactions of The China Welding Institution

基　　金：航空科学基金资助项目(2009ZE56011);轻合金加工科学与技术国防重点学科实验室开放基金资助项目(gf200901001)

摘　　要：采用搅拌摩擦焊对TC1钛合金和LF6铝合金异种金属进行了搭接连接,研究了接头的微观组织结构.结果表明,当搅拌头旋转频率为1 500 r/min、焊接速度为60mm/min时,能获得焊缝成形良好、无孔洞和裂纹等缺陷的搭接接头,搭接处铝合金和钛合金充分混合,形成焊核区.焊核两侧进入铝合金中的钛合金在搅拌针的挤压下发生了弯曲,使得钛/铝紧密结合.搭接接头中心部位的搭接界面区呈层状组织,可分为三层,靠近焊核和靠近钛合金母材一侧的均为黑白相间的条带状组织,含有焊接过程中生成的Ti-Al金属间化合物;夹在中间的为黑色片状组织和灰色基体上分布黑色颗粒的条带状组织,分别是被搅入界面区的钛合金母材和钛合金母材与铝合金母材的机械混合物.Dissimilar metals of TC1/LF6 were lap jointed by friction stir welding(FSW) and the microstructure of the lap joint was studied.The results showed that good appearance of weld joint without defects such as cavitation and crack was obtained when the rotation speed of stir head was 1 500 r/min and the welding speed was 60 mm/min.Ti alloy and Al alloy intensively mix and form nugget zone in the lap zone.Ti alloy which is stirred into Al alloy on both sides of the nugget bends under the extrusion effection of the pin and tight couples with Al alloy.The microstrucrure in the interfacial zone of the lap joint center is lamellarstructure and can be divided into three layers.The layer closed to the nugget zone and TC1 base metal is black and white stripped structure which contains Ti-Al intermetallic compound generated during FSW.The layers in the center are black lamellar structure and stripped structure with black particles distributing on the gray matrix.Black lamellar structure is TC1 base metal which is stirred into the interfacial zone,and the stripped structure with black particles distributing on the gray matrix is mechanical mixture of TC1 base metal and LF6 base metal.

关 键 词：钛/铝异种金属 搅拌摩擦焊 搭接接头 微观组织 元素分布 

分 类 号：TG456.9[金属学及工艺—焊接]