Microstructure and Properties of Hot Extruded Al-TiO2 Powder Metallurgic Composites

Abstract

Aluminium metal matrix composites reinforced with TiO2 were synthesized using powder metallurgy route. The compositions such as Al-2.5%TiO2, Al-5%TiO2, Al-7.5%TiO2 and Al-10%TiO2 were milled using ball mill for 1 hour. The green compacts were prepared using 400 kN hydraulic press. The sintering was done by using electric muffle furnace at a temperature of 550°C for 1 hour. Hot extrusion was carried out for the sintered composite samples with suitable punch and die. The mechanical properties such as ultimate tensile strength, yield strength, percentage elongation and hardness have been studied for the hot extruded samples. The microstructures of the extruded composites were analyzed using optical microscope and reported. The high compressive strength was obtained for the Al-5%TiO2 composite.