An effect of nano-SiC with different dielectric mediums on AZ61/7.5% B4C nanocomposites studied through electrical discharge machining and Taguchi based complex proportional assessment method

Magnesium based nanocomposites are new lightweight and high-performance materials for potential applications in biomedical, electronics, aerospace and automotive sectors owing to their lower density when compared with aluminum-based materials and steel. This article discusses the effect of pulse duration, pulse interval, current, gap voltage on Surface Roughness (SR), Material Removal Rate (MRR) and Electrode Wear Rate (EWR) of AZ61/7.5% B 4 C composites have been studied based on the different dielectric medium, kerosene, Electrical Discharge Machining (EDM) oil and nanosilicon carbide added EDM oil. The magnesium nanocomposites have been prepared through stir casting. The L16 orthogonal array has been selected based on the four factors with four levels. The Complex Proportional Assessment (COPRAS) method has been used to find the optimum process parameters. An overall analysis found that the AZ61/7.5% B 4 C composites has produced high mechanical properties compared with 2.5, 5, and 10wt.% B 4 C nanocomposites. The pulse duration has most influencing factor for affecting the MRR and SR using analysis of variance. The developed quadratic models have well fit with experimental values. Using COPRAS, the optimal parameters are observed to be a maximum of 0.00730 g/s MRR, a minimum of 0.00127 g/s EWR, and a SR of 3.196 µm. The nano-SiC powder with EDM oil has a higher improvement than that of kerosene and EDM oil. The nano-SiC mixed EDM oil produces an improved performance measure of 81% MRR, 55% EWR, and 47% SR.