Phase, Microstructure, and Tensile Strength of Al6351-Graphite-WC Hybrid Metal Matrix Composites

This study investigates the microstructure and mechanical characteristics of Al6351-based hybrid metal matrix composites reinforced with Graphite (Gr) and Tungsten carbide (WC) (0.5-0.5, 1.0-1.0, 1.5-1.5, and 2.0-2.0 wt%). The liquid metallurgy (stir casting) route was used to prepare the hybrid composites, the microstructure and material performance were characterized by using SEM, X-ray diffraction, impact, hardness, and tensile testing. According to the findings, incorporating graphite and tungsten carbide into the composite led to enhancements in both microstructure and mechanical properties. The sample reinforced with 1 wt% Gr and 1 wt% TiC carbide demonstrated the highest tensile strength, and hardness. The highest recorded value of Engg. UTS and Rockwell hardness were 199.2 N mm-2 and 76 HRC, respectively. On the other hand, the composite that contained 0.5 wt% graphite and 0.5 wt% tungsten carbide exhibited the best toughness as 28 joules, among all the samples that were produced. The lowest density was observed with 2 wt% Gr and 2 wt% TiC reinforcement as 2.62 g cc-1. A uniform dispersion of reinforcement particles was observed. The findings of this study suggest potential applications of hybrid MMCs reinforced with graphite and tungsten carbide in the aerospace and automotive industries.