Al 6061-SiCp metal matrix composites were synthesized successfully using sand casting processes. The effects of volume fractions of reinforcements on the composite properties were investigated. Vortex method was used to add the reinforcement particles with the Al 6061 alloy. The sand mould was prepared to make the composite castings. The microstructural characterization studies revealed the uniform distribution of SiC particles in the aluminium matrix and particle clustering in some places. The results of mechanical characterization revealed that the density, hardness and impact energy of composites increased on increasing the volume fractions of SiC particles.