Role of Red Mud Particles on the Microstructure and Mechanical Behavior of CuAl8 Composites for Brake Caliper Applications
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Abstract
This work deals with the utilisation of red mud particles in the preparation of copper metal matrix composites (MMC) using a liquid metallurgy process. The microstructural characterisation and mechanical behaviour of the MMC were investigated using different compositions of red mud, i.e. 2%, 4% and 6%. A homogenous dispersion of red mud particles was observed from the microstructural investigation. Further, the microhardness and tensile strength were observed to be enhanced as compared with the base alloy. The 6wt% red mud reinforced CuAl8 composite exhibited an increase of 23% in the microhardness value, whereas a 30% improvement in the ultimate tensile strength (UTS) was observed compared with the base copper alloy. Further, ductile fracture was associated with the composite as analysed from the tensile fractography. The enhanced structural properties of the Cu composite will be a suitable material for the replacement of conventional brake caliper applications.
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