Processing and characterization of AA2024/Al₂O₃/SiC reinforces hybrid composites using squeeze casting technique

The present requirement of the automobile industry is seeking lightweight material that satisfies the technical and technological requirements with better mechanical and tribological characteristics. Aluminum matrix composite (AMC) materials meet the requirements of modern demands. AMCs are used in automotive applications as engine cylinders, pistons, disc, and drum brakes. This paper investigates the effect of particle size and wt% of Al₂O₃/SiC reinforcement on mechanical and tribological properties of hybrid metal matrix composites (HMMCs). AA2024 aluminum alloy is reinforced with Al₂O₃/SiC different particle sizes (10, 20 and 40 μm) and weight fractions (upto 10 wt %) fabricated by using a squeeze casting technique. HMMCs were characterized for its properties such as X-ray diffraction (XRD), density, scanning electron microscope (SEM), hardness, tensile strength, wear and coefficient of friction. AA2024/5wt%Al₂O₃/5wt%SiC with 10 µm reinforced particle size showed maximum hardness and tensile strength of 156.4 HV and 531.43 MPa and a decrease in wear rate was observed from 0.00307 to 0.00221 at 10N. Hybrid composites showed improved mechanical and wear resistance suitable for engine cylinder liner applications.