Response surface modeling and optimization of LM25 alloy-based hybrid composites reinforced with red mud and sillimanite particles

Abstract

The present study investigates the tribological behavior of aluminum and silicon (Si) alloy (LM25) based hybrid metal matrix composite (MMC). LM25 alloy is reinforced with three different percentages (5, 10, and 15 wt. %) in a 1:1 ratio of sillimanite and red mud particles utilizing the stir casting method. An analysis of the microstructure shows morphology of reinforcement particles throughout the alloy matrix. Pin-on-disk tests have been performed as per the Box-Behnken Design (BBD) technique to evaluate wear and friction characteristics. Further effect of reinforcement, sliding velocity, and applied load on wear and friction characteristics were analyzed and optimize as 13.48 wt. % reinforcement, 10 N load and 1.5 m/s sliding speed to get optimum properties. SEM analysis showed that the composite surface was more susceptible to wear under high loads since it had a higher degree of deformation.