Effect of hybrid metallic and ceramic reinforcements on the properties of pure magnesium

Abstract

In the present study, hybrid magnesium composites reinforced with SiC and Ti particulates were successfully synthesized using an innovative disintegrated melt deposition technique followed by hot extrusion. Extruded samples were characterized for their microstructural, thermal and mechanical properties. Systematic investigations on the microstructure of the extruded samples revealed retention and uniform distribution of SiC and Ti particulates, good matrix-reinforcement interfacial integrity and limited porosity. Results of properties characterization revealed a decrease in the average coefficient of thermal expansion, and an increase in the hardness, dynamic modulus and 0.2% yield strength with an increase in amount of reinforcement. Ductility, however, was adversely affected. An attempt is made to correlate the presence of hybrid (ceramic + metallic) reinforcements with the improved properties of composites synthesized.