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Composites are continuously evolving as the most demanding materials among various industries because of their reinforced mechanical properties and lesser weight. The present work aimed to fabricate a novel aluminium matrix composite using Aluminium Alloy 6063 T6 as base metal and ceramic boron carbide particles with three different micro sizes viz.104μm, 74μm, and 53μm as reinforcement. For composite fabrication, stir casting technique has been utilized. Micro-structure and mechanical behavior of base alloy and prepared composites has been analyzed in this work. Observing through optical microscopy reveal a uniform and proper distribution of B4C particle in Al matrix, along with cluster formation at few sites. The results also exhibit that hardness of reinforced composite has been found to be more than that of base alloy by 81.35 %, in which composite with particle size 53μm has shown maximum hardness of 75.77HV. The trend in tensile strength indicates that the ultimate tensile strength of composite with boron carbide of mesh size 53μm is more than the base alloy by 20.79% and is also highest among the rest of composites with a value of 219.196MPa.