转速对6061-T6铝合金搅拌摩擦搭接焊接头力学性能的影响

摘要

采用场发射扫描电子显微镜(FE-SEM)，研究转速对厚度为5 mm的6061-T6铝合金搅拌摩擦搭接焊接头的宏观和微观组织、硬度、搭接头剪切性能和失效模式的影响。结果表明：在最低的转速度下，上模板和下模板具有十分相似的硬度分布。采用EDX分析发现，焊核区的断裂面中含有Fe的化合物。%The effect of rotational speed on macro and microstructures, hardness, lap shear performance and failure mode of friction stir lap welding on AA6061-T6 Al alloy with 5 mm in thickness was studied by field-emission scanning electron microscopy (FE-SEM). The results represent much closer hardness distribution in the upper and lower plates at the lowest rotational speed. It indicates the Fe-compounds in the fracture surface of the nugget zone by EDX.