Abstract
An effort has been made in the present investigation to correlate the deformation and sliding wear resistance of a series of nickel-cobalt and nickel-copper single phase, fcc, solid-solution alloys with their stacking fault energy (SFE) by conducting reciprocating sliding wear tests against a diamond ball in ambient air. The surface damage has been characterized through scanning electron microscopy and X-ray photoelectron spectroscopy. For the nickel-cobalt alloys the measured wear rates were found to be mostly controlled by work-hardening and fatigue fracture of the near surface region and a good correlation was obtained between the wear rates and the SFE of these alloys. The same trend has also been observed in nickel-copper alloys having less than 50 wt.% copper. In higher alloy compositions, however, it was found that the influence of SFE on the wear rate is overshadowed by the beneficial lubricating effect of build-up of copper oxides on the wearing alloy surface.
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