Microstructure and Tensile Properties of Al Hybrid Composites Reinforced with SiC Whiskers and SiC Nanoparticles

摘要

2024Al hybrid composites reinforced with 20vol% SiC whiskers and 0vol%, 2vol%, 5vol% and 7vol% SiC nanoparticles respectively, were fabricated by squeeze casting technique. The results show that the reinforcements distribute homogeneously in the matrix of the as-cast composites. Hot extrusion leads to a directional distribution of the SiC whiskers and a more homogenous spatial distribution of the SiC nanoparticles in the composites. Tensile test indicates that the tensile strength and modulus of the composites increase with increasing content of the nanoparticles and raises further after extrusion.