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Now a days aluminium alloy used in all applications like boiler, IC Engines, aircraft etc,.. Due to it’s good mechanical behavior like high strength but it having high thermal expansion coefficient. In olden days cost iron is used for makingIC engine parts due to heavy weight manufacturers shift to aluminium because aluminium have high strength, less weight and good machinability. One of the drawback is it having high thermal expansion coefficient due to that engine parts get damaged. In this investigation adding reinforcement to reduce the thermal expansion coefficient without affecting the mechanical properties. Reinforced like silicon nitride, boron carbide and graphite which good mechanical properties and low thermal expansion coefficient. Adding different percentage of reinforcement to aluminium alloy like sample 1 90% aluminium 7075alloy + 10% silicon nitride, sample 2 85% aluminium 7075alloy + 10% silicon nitride + 5% boron carbide sample 3 80% aluminium 7075alloy + 10% silicon nitride + 10% boron carbide sample 4 85% aluminium 7075alloy + 10% silicon nitride + 5% graphite sample 5 80% aluminium 7075alloy + 10% silicon nitride + 10% graphite. Above sample investigate the mechanical properties like tensile strength hardness and impact strength, thermal property coefficient thermal expansion are studied.