使用搅拌摩擦加工技术,对铝合金表面的铝基Al2O3-TiB2复相涂层进行逆向两道次加工。结果表明,搅拌摩擦加工后涂层的显微组织形貌发生明显的改变。涂层在强烈的摩擦力压力和高温的作用,热喷涂颗粒间原有的孔隙基本消失,涂层和基体之间的间隙减小,涂层组织整体形貌变得紧实而致密。单一方向搅拌摩擦加工,增加了涂层组织内应力,使其硬度(HV)从72提高到85。逆向搅拌摩擦加工区域内的涂层发生了强力的塑性变形,导致发生组织演变,使涂层形貌呈现出纤维形流线组织,该区域涂层硬度大幅度增加,从72提高到150,达到原始涂层的两倍以上。 Using friction stir processing technology, the Al-based Al 2 O 3 -TiB composite coating on the surface of aluminum alloy is reversely processed twice. The results show that the morphology of the microstructure changes obviously after the friction stir processing. Under the action of strong frictional pressure and high temperature, the original pores in the thermal spray particles disappear, the gap between the coating and the matrix decreases, and the overall morphology of the coating becomes firmer and denser. Single-direction friction stir processing increases the internal stress in the coating and increases its hardness (HV) from 72 to 85%. The coating in the area of ​​reverse friction stir processing had a strong plastic deformation, which led to the occurrence of microstructure evolution and the appearance of fiber streamline structure. The hardness of the coating in this area increased greatly from 72 to 150, More than twice the original coating.