Mechanical and corrosion behaviour of 7075 aluminium matrix composite reinforced with TiC and Al2O3 2019-28-0094
Various research regarding new methods of fabrication and modifications of Aluminium alloy to improve the existing properties are going on. The wide application of aluminium in aerospace and automobile Industry, demands improved mechanical properties with little to zero increment in weight. This work is based on the fabrication of hybrid metal matrix composites of 7075 aluminium alloy with the addition of TiC (Titanium Carbide) and Al2O3(Aluminium Oxide) reinforcements is fabricated using stir casting technique. Weight percentage of 5%, Al2O3 8% and Tic 12%, Tic 15% and Al2O3 10%. Samples are prepared for each mass distribution . Varying weight fraction samples are prepared to have a proper comparative study of the mechanical properties. In the fabrication we gradually increased the weight of TiC and Al2O3 as we progressed with the experiment.. The objective is to have a clear idea of mechanical properties variation with variation in reinforcement. Hardness tests is done using optical Brinell Hardness Testing machine . A proper characterisation of the samples was attained by using advanced electron microscopes. Tensile properties of the samples was attained using Universal Testing Machine. The composite samples of reinforced Tic and al2O3 ceramic particles with ductile Al 7075 matrix was successfully prepared which had excellent mechanical properties when compared to Al 7075 alloy. Overall, we observed a gradual increase in the hardness of samples. Sample 1 HBW 82.5 , sample 2 HBW 87.5 and sample 3 HBW 96.This trend can be explained by the particulate strengthening of TiC over the soft ductile Al 7075 during stir casting.