DEVELOPMENT AND CHARACTERIZATION OF HYBRID ALUMINUM MATRIX COMPOSITES REINFORCED WITH SILICON CARBIDE AND CARBONIZED COCONUT SHELL FOR HIGH STRENGTH/LIGHTWEIGHT APPLICATIONS

Abstract

The production of hybrid aluminum matrix composites (HAMCs) using low-cost agro-waste materials as reinforcements is gaining popularity due to their excellent properties, wide industrial applications, and cost-effectiveness. In this study, a hybrid AA6061 matrix composite was synthesized using silicon carbide (SiCp) and carbonized coconut shell (CCSP) particles as reinforcements in a 1:1 ratio through stir casting. The effects of SiCp and CCSP particles of varying sizes and weight fractions on density, hardness, and strength properties were studied. The results indicated that the addition of CCSP and SiCp particles to the alloy decreased its density while enhancing the hardness and tensile strength properties. Mathematical models were developed to predict the hardness and tensile strength of the nano-composite and validated by physical experiments. The microstructure analysis revealed uniform distribution of reinforcing particles in the base matrix and excellent bonding between the base matrix and reinforcements after casting. The hybrid composite can be used in high strength/lightweight applications in the automobile and aerospace industries.