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Dry sliding tribological properties and worn subsurface microstructures were investigated in Cu–Al alloys with Al concentrations of 0–2.2wt%. It was found that the wear volume of Cu–Al alloys decreases with an increasing Al content below 0.5wt%, and increases at higher Al contents above 0.5wt%. For each sample, a worn subsurface layer is generated consisting of dynamic recrystallization (DRX) structures...
Bulk nanostructured Cu sample with nano-scale twin bundles embedded in nano-sized grains was synthesized by using dynamic plastic deformation (DPD) technique. Dry sliding tribological properties of the DPD Cu and the coarse grained (CG) Cu samples were investigated under liquid nitrogen temperature (LNT) in comparison with room temperature (RT) conditions. Experimental results show that the wear volume...
Wear of conventional metallic materials involves various complex solid state processes of which the dominant process is elusive. From a thorough experimental investigation on the worn subsurface structure evolution in pure copper specimens with various microstructures, we conclude that the transformation from the subsurface dynamic recrystallization (DRX) structure into the top nanostructured mixing...
Dry sliding tribological behaviors of nanocrystalline (NC) and coarse grained (CG) Cu were studied by using a ball-on-plate tribometer with a counterface ball of cemented tungsten carbide. The results showed that prior to oxidation and delamination, the steady-state friction coefficients (FCs) of NC and CG Cu are comparable (∼0.35). As oxidation with delamination of wear surface occur, the FC for...
Dynamic plastic deformation (DPD) technique was used to synthesize a bulk nanostructured Cu sample with nano-scale twin bundles (about 1/3 in volume) embedded in nano-sized grains. Dry sliding friction and wear tests of ball-on-plate contact configuration were carried out for the DPD and the coarse grained (CG) Cu samples. The longitudinal-sectional observations of wear track were performed to character...
Unlubricated fretting tests were performed with a nanocrystalline surface layer of a 99.99wt.% copper fabricated by means of surface mechanical attrition treatment (SMAT), in comparison with a coarse-grained (CG) copper. The measured friction and wear data show that the fretting wear resistance is markedly enhanced with the nanocrystalline surface layer relative to the CG counterpart. The friction...
A 99.99wt.% copper plate with a surface layer containing a high density of nano-scaled twins has been synthesized by means of surface mechanical attrition treatment (SMAT). The friction and wear characteristics of the nano-twinned Cu sample were investigated in comparison with those of equiaxed nanocrystalline Cu and coarse-grained (CG) Cu samples. The tribological properties are markedly enhanced...
Surface mechanical attrition treatment (SMAT) was employed to fabricate a nanocrystalline surface layer on a pure copper plate. The grain size is about 10nm in the top layer and increases with an increasing depth from the treated surface. The tribological behavior of the nanocrystalline surface layer was investigated under dry conditions. Experimental results show that the load-bearing ability is...
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