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MM: Fachverband Metall- und Materialphysik

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

MM 20.5: Topical Talk

Dienstag, 1. April 2014, 11:30–12:00, IFW A

Linking experiments and simulations to understand third body formation of tribologically stressed surfaces — •Martin Dienwiebel^1,2, Pantcho Stoyanov^1,2, Pedro A. Romero^1,2, Rolf Merz³, Priska Stemmer⁴, and Michael Moseler^2,5 — ¹Karlsruhe Institute of Technology, MicroTribology Center, IAM-ZBS, Karlsruhe, Germany — ²Fraunhofer IWM, Freiburg, Germany — ³IFOS GmbH, Kaiserslautern, Germany — ⁴University Duisburg-Essen, Duisburg, Germany — ⁵University of Freiburg, Freiburg, Germany

In the present work we aim to link tribometry with atomistic simulations in order to improve our understanding of nanoscale interfacial processes of a tungsten-carbon-hydrogen tribo couple. Sliding induces severe changes of the material with respect to topography, composition and microstructure ( "third body", [1]). Experiments were performed using a novel experimental platform for the on-line correlation of friction, wear and topography under lubricated sliding [1]. Then, in order to elucidate the atomistic level processes which contribute to the observed microstructural evolution in the experiments, classical molecular dynamics are performed employing a bond order potential for the Tungsten-Carbon-Hydrogen system. The combined experimental and simulation data allowed a look at the third body formation of metals (tungsten), ceramics (WC) [3,4] and diamond-like carbon coatings [5].

[1] M. Godet, Wear, 100 (1984) 437-452. [2] S. Korres, M. Dienwiebel, Rev. Sci. Instrum., 81 (2010) 063904. [3] P. Stoyanov et al., Tribol. Lett., 50 (2013) 67-80. [4] P. Stoyanov et al., ACS Appl. Mat. Int., 5 (2013) 6123-6135. [5] P. Stoyanov et al., Acta mater., accepted (2013)