Abstract
An optimum route for the fabrication of Al 2O 3/Cu nanocomposites with sound microstructure and enhanced fracture toughness was investigated. Cu-dispersed Al 2O 3 nanocomposites were obtained via hydrogen reduction and the pulse electric current sintering (PECS) of ball-milled Al 2O 3 and CuO powder mixtures. Microstructural observation of the reduced powder revealed that Cu particles of about 30 nm size homogeneously surrounded the Al 2O 3 powder. The nanocomposites, consolidated by PECS at 1250 °C for 5 min, exhibited full density and enhanced fracture toughness compared with monolithic Al 2O 3.
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