铝基复合材料搅拌摩擦焊研究现状

Aluminum matrix composites have been widely used in the automotive and aerospace industries due to the superior properties of low density, high specific strength, high hardness, good electrical conductivity and thermal stability. Therefore, as one of the important engineering structure materials, the welding of aluminum matrix composites has been paid extensive attention by the scholars at home and abroad. However, the weldability of the aluminum matrix composites is relatively poor, which could be attributed to significant difference in the thermal expansion coefficient and thermal conductivity between additional reinforcing particles and aluminum alloy. For traditional fusion welding, it is difficult to weld aluminum matrix composites due to the poor joint quality and mechanical performance, which restricts its industrial application. Friction stir welding (FSW), as a new solid state joining method, has shown a series of advantages in case of welding aluminum matrix composites. The welded joints generally exhibit good formation and excellent mechanical performance. In recent years, FSW has received extensive interests. In this paper, the research status of friction stir welding for aluminum matrix composites is introduced, and the future research direction is prospected.