Abstract
This study presents a comprehensive investigation of the microstructural characteristics, hardness, and tribological physical characteristics of Aluminum (Al) AA6063 alloy matrix composites strengthened with Titanium Dioxide (TiO2) and Tungsten Carbide (WC) particles. The mono and hybrid Metal Matrix Composites (MMCs) were manufactured via the stir casting manner with 5 wt.% TiO2 and varying wt.% of WC (0% to 1.0%) to study the influence of reinforcement on material properties. The T6 thermal treatment was performed on the MMCs with different ageing temperatures (145 °C, 165 °C, and 185 °C). Vickers hardness testing demonstrated improved hardness with increasing particles, and 165 °C aged hybrid MMC showed higher hardness, which is 37% higher than the as-cast hybrid MMC hardness. The microstructural exploration using Scanning Electron Microscopy (SEM) and Energy-Dispersive X-ray Spectroscopy (EDS) publicized an even dissemination of reinforcement phases inside the Al matrix. X-ray Diffraction (XRD) observed the occurrence of Al, TiO2, and WC particles. The tribological behavior was evaluated through pin-on-disc testing, showing a reduced Specific Wear Rate (SWR) with higher reinforcement content, and sliding wear impacting wear variables were optimized through the Taguchi technique. The lower load condition showed a mild SWR with an abrasive wear mechanism, highlighting the MMC's potential for wear-resistant applications.
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