Exploring the mechanical and microstructural characterization of stir cast aluminum 8011 matrix hybrid composites

Abstract Aluminum matrix composites (AMCs) are increasingly vital in aerospace and automotive industries due to their superior strength-to-weight ratio and enhanced mechanical properties. This study explores the mechanical performance of AA8011 aluminum matrix composites reinforced with silicon carbide (SiC) and titanium diboride (TiB2), fabricated using stir casting. The selection of SiC and TiB2 addresses the need for improved hardness, wear resistance, and tensile strength in lightweight materials. Comprehensive mechanical characterization, including tensile strength, hardness, flexural strength, and impact resistance, demonstrated significant improvements. The tensile strength increased from 64.25 MPa to 69.75 MPa, while Vickers hardness rose from 29.9 HV to 69.03 HV, indicating the effectiveness of reinforcement. X-ray diffraction (XRD) confirmed the presence of reinforcing phases, and scanning electron microscopy (SEM) revealed a uniform distribution of particulates, minimizing porosity and enhancing mechanical integrity. Microstructural analysis of fractured surfaces displayed ductile failure characteristics, with micro void coalescence and nucleation sites contributing to the improved mechanical behavior.