AA2024 Alloy-Silicon Carbide-Al2O3 Hybrid Composites

Authors

Ramya D R, Research Scholar, Chemistry R&D Centre
Department of Chemistry, Raja Rajeswari College of Engineering, Bangalore, Karnataka, India.
Pruthviraj R D,
Associate Professor, Chemistry R&D Centre
Department of Chemistry, Raja Rajeswari College of Engineering, Bangalore, Karnataka, India.

Abstract

This paper reports on the mechanical properties of as-cast and heat-treated AA2024 alloy hybrid composites reinforced with SiC/Al2O3 from 1 to 5 wt%. The hybrid composites were fabricated using the Compocasting method, in which short SiC/Al2O3were introduced into the vortex created in the molten alloy through an impeller rotated at 500 rpm. The molten mass was thoroughly stirred and poured into permanent molds and squeezed under pressure. The specimens were heat treated at 575 °C for 1, 2,3, and 4 h. The tests on the as-cast hybrid composites revealed that as the glass content in the hybrid composites was increased, the ultimate tensile strength (UTS), compressive strength, and hardness of the composite increased, while the ductility and impact strength were decreased. Heat treatment was found to improve significantly the ductility, compressive strength, and impact strength, while the hardness and UTS were reduced. This paper discusses the behavior of these hybrid composites.