Abstract
The mechanical properties of nanocomposite Ag-Al2O3 and Fe-SiO2 granular metal films were investigated by low-load indentation and laser ultrasonic methods. A discontinuity in the rate of change of hardness as a function of metal volume fraction was observed near the percolation threshold for the metal. However, the sign of the rate of change was different for the two systems. It is suggested that this discontinuity was the result of a change in deformation mechanism as the percolation threshold for the softer phase was crossed. The elastic moduli of the Ag-Al2O3 films as measured by a laser ultrasonic technique displayed a rule-of-mixtures-type behavior, in contrast to nanoindentation measurements that gave a peak in the apparent compliance. Indentation crack testing indicated that the toughness increased in the Ag-Al2O3 system when the metallic phase was introduced into the ceramic, but that the Fe-SiO2 system displayed unexpected and novel fracture behavior.
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