Tribological Behavior at Dry Sliding by Electric Current of Cu-Cr-S Alloy after Equal Channel Angular Pressing

The wear tests of ultrafine-grained Cu-0.68Cr-0.02S energy alloy after equal channel angular pressing followed heat treatment were carried out in alloy-graphite sliding pair system without lubricant at different contact electrical current density. The sutable microstructure, mechanical properties and electrical conductivity of severely deformed alloy have been formed on the samples with different levels of parameters of thermomechanical processing. The microstructure and wear surfaces of the samples have been studied using optical microscope and field emission scanning electron microscope equipped with energy dispersive spectrometer. The results illustrated that the mass loss at wear, wear rate and wear mechanism depend on microstructure, hardness and electrical conductivity of test materials as well as normal pressure stress and electrical current density on the contact surface. The mechanical and physical properties of alloy, testing parameters and their influence on the wear rate as well as wear mechanism are analyzed.