This paper reports ‘on the influence of multi-pass friction stir processing (MFSP) on AA6082/AA1050 dissimilar joints produced by friction stir welding (FSW) technique. The produced dissimilar joints were subjected to 1pass (1P), 2pass (2P), 3pass (3P), and 4pass (4P) friction stir processing (FSP) procedure. The microstructural analysis showed the decrease in grain size with an increase in number of FSP passes. However, the tensile properties showed inverse relations with the number of FSP passes and this was linked to the dissolution of strengthening precipitates. The fractographic analysis showed the presence of dimples on all the fractured surfaces and that is an indication ductile fracture. However, the fractured surface of the 4P specimen was characterized by the presence of dimples mixed with flat structures which indicates ductility mixed with brittleness. There was no major influence of the number’ of FSP passes on the microhardness of the AA6082/AA1050 joint.

本文报告了“多道次搅拌摩擦加工 (MFSP) 对通过搅拌摩擦焊 (FSW) 技术生产的 AA6082/AA1050 异种接头的影响。生产的异种接头经过 1pass (1P)、2pass (2P)、3pass (3P) 和 4pass (4P) 搅拌摩擦加工 (FSP) 程序。微观结构分析表明，随着 FSP 道次数量的增加，晶粒尺寸减小。然而，拉伸性能与 FSP 道次数量呈反比关系，这与强化析出物的溶解有关。断口分析显示所有断裂表面上都存在凹坑，这是韧性断裂的迹象。然而，4P 试样的断裂表面的特征是存在混合有扁平结构的凹坑，这表明韧性与脆性混合在一起。FSP 道次次数对 AA6082/AA1050 接头的显微硬度没有重大影响。