Unreinforced 6066aluminium alloy a nd the alloy reinforced by SiC partic ulate with various volume fraction were fabricated by spray atomization and co -deposition,and also the unreinforced alloy was fabr icated by as -melten as a contrast,an d the materials were then extruded.It was observed that the aging respon ses of 6066Al and 6066Al /SiCp fabric ated by spray atomization and co -dep osition were accelerated.Metal-lography and transmission electron microscopy(TEM)were utilized to inspect the microstructures of the materials.The effect of processing route and the increased dislocation density resulted from the addition of SiC p articulate into metal matrix on the a ging behavior of the materials was di s-cussed.It is shown that the concentr ation of solute atomand kinetics of phase transformation in materials fa bricated by spray atomization and co-deposition are much higher than the o thers in this paper.Moreover,the decrease in grain size induced by spray atomization and co -deposition and the increased dislocation density in composites resulted from the ad dition of SiC particulates lead to su fficient positions for inhomogeneo ns nucleation and thus accelerate the k inetics of aging precipitation of th e materials involved in this study.