A typical 6061-T6 Aluminum alloy has 12-17 % elongation at the fracture point. However here, after the annealing process, which made the base metal more ductile, the maximum elongation has reached 27.5 %. This value is 25.3 %, 20 %, and 19.3 % for powder-free, micro-alumina, and nano-alumina cases. These values indicate that the samples have become slightly brittle than the base metal after friction stir processing and even more brittle after adding alumina particles.