Cu/Ti异种金属搅拌摩擦焊搭接接头组织与性能

文中采用搅拌摩擦焊法搭接T2工业紫铜和TA2纯钛,研究了搭接接头的宏观形貌和微观组织结构,并测试了接头力学性能.结果表明,当选用搅拌头旋转频率为800 r/min,焊接速度为40 mm/min的工艺参数配比时,可以获得焊缝表面成形良好,连接界面无缺陷的搭接接头.在焊核区,钛和铜以相间的条带结构形式相互混合、紧密连接在一起,形成了涡流状的钛铜双相金属混合区域,而且某些区域呈现出"机械互锁"的组织形貌.钛铜搭接接头抗剪切力可达到铜母材失效载荷的95%,断裂位置位于搭接接头铜板前进侧,为典型的韧性断裂.

Microstructure and properties of dissimilar materials Cu/Ti lapped joint by friction stir welding

The lap joint of commercial purity titanium (TA2) and copper (T2) plates were successfully produced via friction stir welding technique,the macrostructure and microstructure of Cu/Ti lap interface were researched respectively. The mechanical properties of the joint were characterized by tensile shear tests as well. The results show that the defect-free lapwelds with well-formed surface and interface of joint were obtained when rotation speed and travel speed were 800 r/min,40 mm/min respectively. The interface of joint exhibited the typical bounded texture microstructure of Cu and Ti in the stir zone,and a region of swirling-like of bimetallic weld of TA2 titanium and T2 copper was formed. Moreover,mechanical interlock was formed in some parts of lap joint. A maximum failure load of 95% of the one of T2 copper was achieved, and the fracture location was located in the advancing side of copper, the fracture was the typical ductile fracture.