铝-铜异种材料搅拌摩擦焊接头组织及性能研究  

Microstructure and properties of the dissimilar Al-Cu friction stir welding joints

作　　者：张秋征[1] 宫文彪[1] 毛亚芬[1] 邓清洪[2] 

机构地区：[1]长春工业大学先进结构材料教育部重点实验室,130012 [2]燕山大学材料科学与工程学院,秦皇岛市066004

出　　处：《焊接》2014年第7期40-43,74,共4页Welding & Joining

基　　金：吉林省科技厅高科技资助项目(20100362)

摘　　要：采用搅拌摩擦焊对3 mm厚的T2紫铜和工业纯铝进行对接焊,结果表明:焊接前对T2紫铜进行退火处理,同时搅拌针相对于配合面向铝侧偏移时,可以减小搅拌针粘连问题,获得成形良好的焊接接头。搅拌区形成沿搅拌头旋转方向连续分布片层状与涡流状复杂结构。接头抗拉强度为112 MPa,为工业纯铝母材强度的86.2%左右,试样拉伸断裂位置位于搅拌区前进侧过度区域,断口SEM形貌呈现明显的脆性断裂特征;接头前进侧热影响区出现了不同程度的软化现象,焊核区最低硬度为51.02 HV,均低于两侧母材硬度。Pure copper and aluminum with a thickness of 3 mm was butt welded by friction stir welding.The results showed that sound defectfree joints could be obtained by preannealing treatment of pure copper and a pin-off to the aluminum side method.Complicated microstructures were formed in the nugget,in which lamella structure and vortex-like pattern could be found.The tensile strength of the joint is 112 MPa,which is 86.2%of that of the aluminum matrix.The fracture position is located at the transition zone of advanced side and the dissimilar joint fails with a brittle fracture mode.The hardness values at the heat affected zone of advanced side present a softening phenomenon and the minimum value of hardness 51.02 HV appeared in the weld nugget zone,which is lower than that of the parent materials.

关 键 词：铝 铜异种材料 搅拌摩擦焊 组织 性能 

分 类 号：TG442[金属学及工艺—焊接]