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Influence of TiO₂ and WC particles on the hardness and corrosion behavior of the AA6063 ALLOY reinforced hybrid composite

Singh S. Prathap, Raja D. Elil, Gnanasekaran K., Basha I. Ameeth, Sonar Tushar, Ajith V. S., Elvish S.

Advances in Materials Science

2025

Vol. 25, nr 3(85)

67--84

This work focuses on improving the mechanical strength and corrosion resistance of Aluminum (Al) AA6063 alloy, which is limited by its moderate hardness and exposure to acidic conditions. The main aim of this study is to examine the effect of Titanium Dioxide (TiO₂) and Tungsten Carbide (WC) particles on the hardness and acidic immersion corrosion of AA6063 alloy-based monolithic and hybrid Metal Matrix Composites (MMCs), which were manufactured via stir casting with a fixed 5 wt.% TiO₂ and varying wt.% of WC (0, 0.5, and 1 wt.%), followed by T6 heat treatment at different aging temperatures of 145°C, 165°C, and 185°C. The microstructural exploration using Hi-Resolution Scanning Electron Microscopy (HRSEM) and Energy-Dispersive X-ray Spectroscopy (EDS) showed an even dissemination of reinforcements. X-ray Diffraction (XRD) observed the occurrence of Al, TiO₂, WC, and Mg₂Si phases. Taguchi’s methodology optimized the Vicker’s hardness and Corrosion Rate (CR), considering aging temperature and wt.% of WC as the input variables. Analysis of Variance (ANOVA) results indicated that the variation in WC content had a more significant effect on both hardness and CR than the aging temperature. The 165°C aged samples produced high hardness and lower CR due to the Silicon (Si) spheroidization. The HRSEM examination of corroded surfaces revealed fewer signs of deep pits at lower CR conditions. The results indicate that the selective incorporation of WC and TiO₂ can improve the performance of AA6063 composites in corrosive environments.

A Study of Mechanical and Wear Behavior of SiC-CeO2 Reinforced Al7075 Hot Rolled Hybrid Composites

Ravikumar Mukundaiah, Naik Rudra, Suresh R., Chethana K. Y.

Archives of Metallurgy and Materials

2024

Vol. 69, iss. 3

903--910

Fabrication of aluminium (Al) composites by stir casting process is an effective method for fabrication of better quality of Metal Matrix Composites (MMCs). Stir casting technique is one of the most commonly accepted techniques. In this research work, Al7075 / SiC+CeO2 hybrid MMCs have been fabricated with varying wt.% of SiC (2%, 4%, 6% and 8%) particulates and constant 5% of CeO2 particulates. The ascast alloy and hybrid composite were hot rolled at a temperature of 500°C. Whereas, both the ascast and hot rolled hybrid composite was subjected to micro-structural, mechanical and wear tests. Optical microscope analysis revealed uniform dispersal of hard particles with in the base matrix in case of both of ascast and hot rolled composites. Hot rolled MMCs showed enhancement of 22.64% of hardness when compared with ascast alloy with increasing reinforcement of 0-6 wt.% of SiC content. Tensile strength increases by 28.24% for hot rolled composites when compared to the as cast and other hybrid composites. Reduction of wear loss by 54.38% for hot rolled composites when compared to the as cast and other hybrid composites. A tensile and wear fractography result shows the internal fractured structure which was analysed using a SEM analysis.