Fabrication and mechanical properties (strength and fracture toughness) of chilled aluminum alloy–glass particulate composite

This paper describes the results obtained and deductions made from a series of strength and fracture toughness tests performed on chilled Aluminum–Glass particulate composite containing dispersoid (size 20–50 μm) content ranging from 3 to 12 wt.% in steps of 3%. The resulting composites cast in moulds at room temperature containing metallic (copper, steel, cast iron) and non-metallic (silicon carbide) chills. The effect of strength and fracture toughness for varying chilling rate and dispersoid content was also examined. The strength and fracture toughness tests were carried out in conformance with AFS (American Foundrymen Society) and ASTM (E 399 1990) standards. Results of the investigation reveal that there is good bonding with consistency in the matrix and as the glass content is increased, the strength and fracture toughness increase remarkably and is highly dependent on the location of the casting from where the test specimens are taken. Large particles and the regions of clusters of particles were found to be the locations prone to damage the composite prior to final fracture.