Tribological properties of highly alloyed fcc materials
Tribological loads cause a microstructural evolution in the near subsurface area for metallic materials. As the tribological properties are influenced by the dynamic microstructural evolution, a fundamental understanding of the ongoing deformation processes is mandatory. In the present study, we compare the friction coefficients as well as the microstructural evolution of 316L, NiCoCr and CoCrFeMnNi after a single trace experiment to investigate the influence of different alloying degrees in fcc solid solutions. While the deformation layers of CoCrFeMnNi and NiCoCr are comparable, the one of 316L is more localized beneath the surface. The deformation mechanisms were further analysed by scanning electron microscopy (STEM) and transmission Kikuchi diffraction (TKD). It was found, that the deformation layer of CoCrFeMnNi and NiCoCr exists out of a fine-grained layer and a layer with bands, whereby the later consist out of twins. In contrast the deformation layer of 316L only shows a fine grained layer. An influencing parameter is not only the bulk mechanical properties, but also the adhesion of the materials in contact. The work of adhesion was investigated by contact angle measurements and nanoindentation. So far, the exact interplay between the chosen tribosystem, resulting deformation layer and tribological response is not understood; first insights will be presented.