In the current experimental study, several specimens of 6061-T6 Aluminum alloy are provided and considered as the base metal. Then, three different composites made of these specimens are fabricated using friction stir processing. The first composite is processed without any powder, while for the other two composites, Alumina powders in micro and nano sizes are added as reinforcing particles. Between these composites and the base metal, mechanical properties (tensile strength, hardness, toughness, ductility, and failure mode) and corrosion resistance are analyzed and compared.