Abstract: In the field of material science, a large number of research is going on composite materials in current industries. The Aluminium metal matrix composite material has a characteristic of low density, cast ability, low thermal coefficient and machinability properties. Due to these properties researchers are concentrating towards Aluminium metal matrix composite material. The stir casting process was used to fabricate A356 alloy based hybrid composites reinforced with various weight fractions of 1%, 2%, 3%, 4% & 5% RHA and Al2O3 particulates in equal proportions. Tensile strength and Hardness of the composites have been evaluated. Significant improvement in the properties was been observed with the addition of reinforcement. Further, properties of heat treated composites were enhanced when compared to as cast composites.