Abstract
Sliding friction experiments were conducted on zinc single-crystal (0001) surfaces with sliding restricted to the (1010) directions. A ruby ball (9.0 mm diameter) contacted the crystal surface under loads of from 50 to 300 grams at sliding velocities from 0.02 to 14 mm/minute. Surface films were found to influence plastic deformation. Oxides reduced plastic deformation while organic films increased plasticity during sliding. Ion implanted lead films also increased plasticity. Deformation mode was also influenced by the film present. With oxide, twins were observed while with organic films, deformation was exclusively by slip. The higher the sliding velocity, the less was the surface deformation. Track width increased with transition from the brittle to ductile state.
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