Recycling of aluminium based metal matrix composite using disintegrated melt deposition technique

Abstract

In the present study, the feasibility of recycling a silicon carbide particulate reinforced aluminium composite was investigated. The composite was systhesised and recycled using an innovative disintegrated melt deposition technique. Microstructural characterisation studies revealed a marginal decrease in porosity, reinforcement content and size, no change in reinforcement distribution pattern, and improved interracial integrity between matrix and reinforcement following recycling. Microhardness measurements revealed an increase in the hardness of the interfacial region in the recycled specimens. Results of physical and mechanical property characterisation revealed an increase in elastic modulus, 0·2% yield strength, ultimate tensile strength, and ductility, and a reduction in the coefficient of thermal expansion of the recycled specimens when compared with the parent composite. These properties were rationalised in terms of the microstructural characteristics associated with the disintegrated melt deposited composite specimens. Particular emphasis is placed on the study of the effect of recycling on the microstructure and properties of the composite. © 2000 IoM Communications Ltd.