Validation of hardness and tensile strength of Al-Mg alloy reinforced with silicon carbide and graphite hybrid composite by regression equation

In this article, Al6061 alloy is reinforced with SiC and graphite powder for the fabrication of Al6061/Gr./SiC hybrid composite routed through stir casting technique. The silicon carbide is varied at 2%, 4% and 6 wt% whereas graphite powders is varied at 1%, 3%, 5% and 7 wt% in Al6061 alloy. The cast specimens were machined as per ASTM E8M-15a for tensile test sample and IS 1501 for hardness specimen by using lathe machine tool. Hardness and tensile strength of Al6061/SiC/Gr. hybrid composite increased with increase in wt.% of reinforcement when compared to as received Al6061 alloy. Taguchi Technique have been used to evaluate the optimization, effect of parameter, S/N ratio and General Linear (GL) regression equation were derived for validation of experimental values. Wt.% of graphite have high contribution of about 61.67% and 60.82% for tensile strength and Vicker's hardness. The confirmation result revealed the good agreement with the experimental result for tensile strength and hardness of Al6061/SiC/Gr. hybrid composites. © 2021