Fabrication and Mechanical Behaviour of Aluminium Alloy 2219-Sic-Flyash Hybrid MMC’s by Stir Casting

T N V Ashok Kumar1, Saleem Shaik1, V Durga Rao3

1Assistant Professor, Department of Mechanical Engineering, Sir C R Reddy College of Engineering, Eluru

2Assistant Professor, Department of Mechanical Engineering, Swarnandhra College of Engineering and Technology, Narsapuram

Abstract: The development of hybrid metal matrix composites (HMMCs) has gained significant attention in material science due to their superior mechanical properties and adaptability for structural applications. This study focuses on the fabrication and evaluation of Aluminium 2219-based metal matrix composites reinforced with a fixed quantity of silicon carbide (5g) and varying amounts of fly ash (5g, 10g, 15g, and 20g) using the stir casting technique. Key process parameters such as stirring speed, temperature, and reinforcement feed rate were optimized to ensure uniform particle dispersion. The primary aim was to enhance the physical and mechanical properties of the base metal by combining the strength of reinforcements with the toughness of the matrix. Mechanical characterization included Vickers hardness testing, compression strength assessment, and corrosion resistance evaluation in a 5% HCl environment. The results demonstrated that increased reinforcement content improved hardness and compressive strength significantly, with the highest performance observed in the Al-75g + SiC-5g + Fly Ash-20g composition. However, an increase in reinforcement also led to a reduction in corrosion resistance, as evidenced by higher weight loss over time. The findings confirm that aluminium metal matrix composites can be engineered to achieve a desirable balance of strength, toughness, and durability, making them suitable for advanced structural and engineering applications.