Aluminium and its alloys have an excellent mechanical property in that metal matrix composite has a promising role in the field of automobile and aviation. This work aims to investigate the hardness and impact strength of aluminium Al2024, Al6061 and Al7075 alloy reinforced with a weight fraction of fine greenish silicon carbide 7% and chopped E-glass fiber 3%. The metal matrix composite plates were welded by using the friction stir welding process at 550, 850 and 1150 rpm with a feed rate of 40, 80, 120 mm/min. Hardness specimens are prepared as per ASTM-E-92 and investigated the hardness of welded and unwelded (base metals and composite metal) in nugget zone, HAZ and TMAZ with the help of Vickers hardness test machine. Impact strength specimens are prepared as per ASTM-E-23. The results were compared with welded and unwelded aluminium specimens.
The current study focuses on the effect of the different ceramic reinforcement on the aluminium composite. The pros and cons of AMMCs are studied. In SiC reinforced composite’s wear resistance, tensile strength and hardness will be improved, as it acts as an obstacle to the dislocation of atoms. B4C reinforced composites form more pores and agglomeration by the increase in B4C content however the hardness improves at the expense of ductility. TiC reinforced composite’s interfacial bonding is good below 600 °C and the coefficient of thermal expansion reduces by increasing TiC weight percentage also mechanical properties like tensile and compressive strength improves. Al2O3 reinforcement will make grains finer hence adding Al2O3 improves the mechanical properties of the composite and it doesn’t react with the matrix at high temperature. ZrO2 reinforcement will improve the hardness and wear resistance although primary wear happens due to micro-cutting and oxidation. As mentioned each reinforcement has both advantages and disadvantages, based on the application required reinforcement will be selected.
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