Friction stir processing (FSP) is a solid-state process with the ability to affect the microstructure and mechanical properties of materials in locally defined areas, creating efficient crack deflection or reinforcement structures. Regarding high-performance materials such as aluminium matrix composites (AMC) friction stir processing additionally offers the possibility to enhance the distribution of particles and reduce remaining pores resulting in a more homogeneous AMC. To further improve this homogeneity, the friction stir process was combined with the transmission of power ultrasound leading to the hybrid process of ultrasound enhanced friction stir processing (USE-FSP). In the present work an aluminium matrix composite consisting of AA6061 reinforced with 10 % particles of silicon carbide was manufactured in house by spark plasma sintering and afterwards processed by FSP as well as USE-FSP. The resulting microstructural and mechanical properties were investigated and compared in detail.