In the present study, monolithic magnesium, nanosized SiC reinforced magnesium and nanosized hybrid reinforced magnesium materials have been synthesized by using powder metallurgy route involving microwave sintering followed by hot extrusion. The results show that the monolithic and the reinforced magnesium materials have minimal porosity and the reinforced magnesium materials have fairly well distributed nanosized SiC and particles in the matrix. The thermo-mechanical property measured in terms of coefficient of thermal expansion of the reinforced magnesium shows dimensionally more stable magnesium as compared to monolithic magnesium. The hardness 0.2% YS and UTS were found to improve significantly after addition of nanosized SiC and nanosized hybrid particles to the magnesium, However, ductility measured in terms of failure strain was found to be marginally reduced. Fractography results showed the presence of brittle failure mode with cleavage steps on the fractured surface of the magnesium matrix.
Issue Section:
Technical Papers
Keywords:
sintering,
particle reinforced composites,
nanocomposites,
magnesium,
silicon compounds,
alumina,
powder metallurgy,
extrusion,
porosity,
nanoparticles,
thermomechanical treatment,
thermal expansion,
hardness,
ductility,
fractography,
brittle fracture,
hybrid composites,
nanocomposites,
magnesium,
mechanical properties,
coefficient of thermal expansion
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