Abstract
Metal matrix composites are formed by combination of two or more materials having dissimilar characteristics. In the present investigation, Aluminium (Al7075) is taken as base matrix metal, Tungsten Carbide (WC) particulate and Molybdenum Disulphide (MoS2) as reinforcements. The metal matrix composites are fabricated by stir-casting process. The Tungsten Carbide particulate was added in proportions of 2%, 4%, 6%, 8% and 10% and Molybdenum Disulphide was added in constant proportion of 4% on mass fraction basis to the molten metal. The different combination sets of composites were prepared. Mechanical properties like hardness and tensile strength were studied for both reinforced and unreinforced Al7075 samples. Microstructure examination was carried by using Metallurgical Microscope to obtain the distribution of Tungsten Carbide particulate and Molybdenum Disulphide in base matrix. From the results, it was found that the hardness and tensile strength of the prepared metal matrix composites increases with increasing weight percentage of Tungsten Carbide, however a decreasing trend of hardness is found at 8% and 10% of Tungsten Carbide. This could be attributed to agglomeration of the Tungsten Carbide particles due to insufficient rpm of the stirrer.
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