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Influence of alumina percentage on hot deformation of aluminium–alumina matrix composite

Abstract Aluminium–alumina Al–Al2O3 metal matrix composites were fabricated using the powder metallurgy techniques and ex situ casting. Different reinforcement volume fractions were used, that is, 0, 6, 10 and 18 vol.-% Al2O3. The effect of percentage of alumina particles was investigated through hot tensile deformation conducted at 773 K temperature. Scanning electron microscopy was used to study the microstructure of the produced composite. The tensile strength of the Al–Al2O3 was found to improve as a function of reinforcement volume fraction. With the exception of Al–18 vol.-%Al2O3, the metal matrix composite showed better strength and behaviour at high temperature of the test than the unreinforced matrix.