Abstract: Light weight metal matrix composites based on aluminum alloy and TiB2 particulates has emerged as an important class of materials and finding increasing applications in automobile, aero-space and space industries, in their quest for achieving better fuel economy. In order to fabricate a kind of high strength particulate reinforced aluminum alloy matrix composites, a high strength aluminum-10silicon alloy was selected as a matrix and composites reinforced with varying amounts of TiB2 particles from 2 to 10% were synthesized using stir casting method. The deformation behaviour was analyzed. Stress of base Al -10Si alloy and its TiB2 composites in the as cast condition has increased with increase in deformation in both samples of aspect ratio 1 and 1.5. Load required to deform of base Al -10Si alloy and its TiB2 composites in the as cast condition increased with increase in reinforcement content as well as with aspect ratio. The increase in the properties could be attributed to be good bonding of TiB2 particles and aluminum matrix. Stress of base Al -10Si alloy and its TiB2 composites in the as cast condition has increased with increase in deformation in both samples of aspect ratio 1 and 1.5. But hardness has decreased with with increased aspect ratio. Strength coefficient (K) and strain hardening exponent (n) of Al-10Si-10TiB2 considered in the present investigation was found to be 386.1 and 0.493 shows that the material has good flow stress per unit strain, good formability and can be work hardened at higher rate compared to its base Al -10Si alloy and its composites. Bulge diameter for base Al-10Si alloy and its composites increased with increasing degree of deformation, due to friction at contact surfaces, where as radius of curvature of bulge decreased with increasing degree of deformation.