Development and Characterization of New Magnesium Based Nanocomposites

Abstract

This project focuses on the development of new magnesium based nanocomposites using powder metallurgy route incorporating hybrid microwave sintering method. Microwave sintering can lead to a significant reduction in sintering time and energy consumption when compared to conventional sintering. Magnesium nanocomposites containing 0.17 and 0.7 vol.% nano-yttria reinforcements were synthesized initially. Between two compositions, Mg/0.7Y2O3 nanocomposite exhibited best strength and ductility combination. Consequently, an attempt was made to optimize the heating rate during hybrid microwave sintering and extrusion ratio on Mg and Mg/0.7Y2O3 nanocomposite. Aiming to further enhance the properties of Mg/0.7Y2O3 nanocomposite and to establish the effectiveness of microwave sintering approach, hybrid magnesium nanocomposites were developed. Using the optimized heating rate and extrusion ratio, two hybrid nanocomposite systems, Mg/(Y2O3+Cu) and Mg/(Y2O3+Ni) were synthesized. Characterization studies were conducted on synthesized materials. Detailed and insightful investigations on microstructural evolution, tensile and compressive properties and deformation mechanisms were critically made.