Electrochemical micro-machining of hybrid graphene/silicon nitride-reinforced magnesium composite through integrated Entropy-COPRAS approach

The present research deals with analyzing the impact of Silicon Nitride (Si 3 N 4 ) on electrochemical machinability behavior of magnesium/graphene hybrid composite. Stir casting approach is adopted to develop the hybrid composite with constant graphene % (0.3 wt. %) and varying Si 3 N 4 % (5, 10, 15 wt. %). L16 orthogonal array is designed through Taguchi method with four control factors, namely, Si 3 N 4 wt. %, feed rate, voltage, and electrolyte concentration each at four levels, whereas Material Removal Rate (MRR) and Surface Roughness (Ra) are considered as response variables. ANOVA confirms that all the input parameters has significant role in governing the MRR and Ra. Electrolyte concentration and feed rate are found as the major influencing factors over MRR and Ra. Si 3 N 4 % exhibited 8.1% influence over MRR, whereas 14.9% influence is exhibited over Ra. Integrated Entropy-COmplex PRoportional ASsessment (COPRAS) method is adopted to attain unique optimal solution for MRR and Ra. COPRAS suggested that optimal condition yielded MRR of 0.11285 g/min along with surface roughness of 6.18 μm.