轴肩尺寸对异种铝合金材料搅拌摩擦焊接头显微组织的影响规律  

Effect of shoulder diameter on microstructure of dissimilar Al alloys friction stir welding joint

作　　者：张津[1] 计鹏飞[1] 周俊[1] 连勇[1] 

机构地区：[1]北京科技大学新材料技术研究院,北京100083

出　　处：《焊接学报》2016年第11期51-54,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51275037)

摘　　要：对5083铝/6082铝异种材料搅拌摩擦焊(friction stir welding,FSW)进行研究,重点分析轴肩直径对横截面形貌、显微组织与显微硬度的影响规律.结果表明,FSW接头焊核区由致密细小的等轴晶组成;增加轴肩直径可增加焊核区沿垂直焊缝方向的宽度以及增大焊核区、热影响区与热力影响区的晶粒尺寸.与后退侧的6082铝合金不同,前进侧5083铝合金的热力影响区发生了动态再结晶.显微硬度呈W形分布,最小值出现在热影响区.显微硬度的测试结果与焊核区的横截面形貌结果吻合.Dissimilar 5083/6082 Al alloys friction stir welding( FSW) joint was experimentally investigated. Effects of the shoulder diameter on the cross section morphology,micro-structure and microhardness are mainly discussed. The welded zone of FSW joint is characterized with fine and equiaxed grains.With the increase of shoulder diameter,the cross section of weld zone perpendicular to the weld is enlarged and all the grains size of the welded zone,heat affected zone and thermo-mechanically affected zone increases. The dynamic recrystallization happens in thermo-mechanically affected zone of 5083 Al alloy at advancing side,which is different to the 6082 Al alloy at retreating side.The microhardness distribution presents a W shape and the minimum value locates at the heat affected zone. The result of microhardness agrees with the cross-section morphology of the welded zone.

关 键 词：搅拌摩擦焊 5083/6082异种材料 显微组织 显微硬度 

分 类 号：TG457.14[金属学及工艺—焊接]