Enhancing mechanical properties of Al-SiC metal matrix composites: A study on reinforcement effects and fracture behaviour using acoustic emissions technique

The structural and mechanical properties of Aluminium-Silicon Carbide (Al-SiC) metal matrix composites (MMCs) made by stir casting are investigated when SiC is added at a range from 0% to 10% by weight. The work examines the primary mechanical properties, including tensile strength, flexural strength, impact strength, hardness, and low-velocity impact resistance, as well as microstructure and acoustic emission analyses. The fact that increasing SiC makes the material stronger and tougher is evident in the results, with tensile strength increasing to 349.57 MPa (a 24.5% rise over pure Al), flexural strength reaching 240.85 MPa (a 108.8% increase over pure Al), and hardness reaching 101.25 BHN. With an increased proportion of SiC in the mixture, the ductility and ability to change shape decrease. The addition of SiC results in a steady increase in impact strength, with the highest level of 53.68 kJ/m² achieved at a 10% concentration, demonstrating the material’s crack resistance. According to the research, Al-SiC MMCs exhibit the best mechanical properties for aerospace and automotive applications when the reinforcement levels are just right. Hybrid reinforcements or small SiC fibers may be examined in future work to reduce brittleness while retaining the best features.

Keywords:
Metal matrix composites; Aluminium-silicon carbide; Stir casting; Acoustic emission