tThis paper present experimental study on improving mechanical properties of Al and Al-xSiC nanocomposites (x = 1, 2 and 4%) synthesized by Accumulative Roll Bonding (ARB)technique. SEM, EDX and XRD analysis was used to characterize the structural changesin the manufactured materials while tensile and microhardness tests were used to char-acterize their mechanical properties. Homogeneous distribution of SiC nanoparticles wasachieved after five ARB cycles. A significant strength improvement was achieved for pro-cessed Al and Al-SiC nanocomposites after five ARB cycles due to grain refinement, grainmisorientation and SiC strengthening. The grain refinement and grain misorientation con-tributed the strength improvement by 161% and 46%, respectively, while the addition of 1%SiC nanopartciles contributed by 78% which is increased to 101% for 4% SiC. The ductility isreduced after the zero ARB cycle however it increased with increasing the number of ARBcycles reaching 8.2 and 5.8% for Al and Al-4% SiC nanocomposites, respectively, after 5 ARBcycles. The fracture shape in the ARBed samples is a combination of necking and shearingwith a tendency to shearing shape for Al-SiC nanocomposites.