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MM: Fachverband Metall- und Materialphysik

MM 20: Topical Session: Nanomechanics of nanostructured materials and systems IV - Tribology/Composites

MM 20.2: Vortrag

Dienstag, 1. April 2014, 10:45–11:00, IFW A

Grain size and orientation evolution of high-purity copper under reciprocating tribological loading — •Christian Greiner and Zhilong Liu — IAM-ZBS, Karlsruhe Institute of Technology, Karlsruhe, Germany

One of the key questions in tribology is to correlate a material's microstructure with its friction and wear properties. However, there is still a significant lack of knowledge about the mechanisms for the evolution of the microstructure under a tribological load.

A reciprocating motion and high-purity copper in contact with a sapphire sphere was investigated. With an annealed initial microstructure, the energy dissipated during the sliding motion was varied by increasing the sliding distance up to several meters. A dual-beam microscopy system (FIB and SEM) was used to investigate the resulting grain size and to perform EBSD and (S)TEM measurements to follow the evolution of the microstructure in the wear track thoroughly. Results for the microstructure evolution, e.g. grain size and preferred orientation, with the sliding distance will be presented.

A long term goal of this study is to develop a model description for the microstructural changes in view of energy and mechanics in order to understand these changes and their influence on the tribological properties. In the future, this might allow for tailored microstructures combining low friction forces and very small wear rates.