Abstract:
Enhanced tribological and location-specific properties achieved in functionally graded metallic composites make them
potential materials for futuristic engineering components. The present investigation aims on the processing of homogenous
and functionally graded Al matrix composites reinforced with SiC particles of 23 mm average particle size by
gravity and centrifugal casting techniques. The sizes of the primary aluminium and eutectic silicon phases are finer
towards the outer periphery due to the higher solidification rate. Functionally graded Al–SiCp composite rings produced
by centrifugal casting show higher concentration of SiCp towards outer periphery, followed by a gradient transition
region and the particle depleted zone. Particle agglomerates formed due to partially wetted particles associated with
voids and gas porosities segregate towards the inner periphery. The higher concentration of reinforcement particles near
the outer periphery in FGM enhances the hardness and wear resistance in rotary and reciprocating wear studies.
Centrifugal cast alloys show enhanced wear resistance than the gravity cast specimen due to fine grains of primary
aluminium and eutectic silicon. The rotary and reciprocating wear test shows the adhesive and abrasive type wear
mechanisms
