Development and Analysis of Al-Matrix Nano Composites Fabricated by Ultrasonic Assisted Squeeze Casting Process

In the present work an attempt has been made to synthesize metal matrix composite using 6061 Al as matrix material reinforced with nano Al2O3 particulates using liquid metallurgy route particularly squeeze casting technique. The nano composites prepared by varying the Al2O3 from 1–3 weight percent. The reinforcement particles were preheated to a temperature of 300 °C and then dispersed in molten Al 6061 alloy to improve wettability and distribution. Mechanical properties of the composites fabricated by squeeze casting process were compared with the ultrasonic stir casting process. The results revealed that the mechanical properties like tensile strength, compressive strength and hardness of composite fabricate by the ultrasonic assisted squeeze casting process is higher than that of ultrasonic assisted stir casting process. Microstructure shows that there is significant grain refinement in the composite fabricate by the ultrasonic assisted squeeze casting process than ultrasonic assisted stir casting process.