Tribology Letters

, Volume 53, Issue 1, pp 119–126

Wear, Plasticity, and Rehybridization in Tetrahedral Amorphous Carbon

  • Tim Kunze
  • Matthias Posselt
  • Sibylle Gemming
  • Gotthard Seifert
  • Andrew R. Konicek
  • Robert W. Carpick
  • Lars Pastewka
  • Michael Moseler
Original Paper

DOI: 10.1007/s11249-013-0250-7

Cite this article as:
Kunze, T., Posselt, M., Gemming, S. et al. Tribol Lett (2014) 53: 119. doi:10.1007/s11249-013-0250-7

Abstract

Wear in self-mated tetrahedral amorphous carbon (ta-C) films is studied by molecular dynamics and near-edge X-ray absorption fine structure spectroscopy. Both theory and experiment demonstrate the formation of a soft amorphous carbon (a-C) layer with increased sp2 content, which grows faster than an a-C tribolayer found on self-mated diamond sliding under similar conditions. The faster \(\hbox{sp}^{3} \rightarrow\,\hbox{ sp}^{2}\) transition in ta-C is explained by easy breaking of prestressed bonds in a finite, nanoscale ta-C region, whereas diamond amorphization occurs at an atomically sharp interface. A detailed analysis of the underlying rehybridization mechanism reveals that the \(\hbox{sp}^{3}\, \rightarrow\hbox{ sp}^{2}\) transition is triggered by plasticity in the adjacent a-C. Rehybridization therefore occurs in a region that has not yet experienced plastic yield. The resulting soft a-C tribolayer is interpreted as a precursor to the experimentally observed wear.

Keywords

Wear Plasticity Rehybridization ta-C Tribology 

Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Tim Kunze
    • 1
  • Matthias Posselt
    • 2
  • Sibylle Gemming
    • 2
  • Gotthard Seifert
    • 1
  • Andrew R. Konicek
    • 3
  • Robert W. Carpick
    • 3
  • Lars Pastewka
    • 4
  • Michael Moseler
    • 4
  1. 1.Theoretical ChemistryUniversity of Technology DresdenDresdenGermany
  2. 2.Helmholtz-Zentrum Dresden-RossendorfDresdenGermany
  3. 3.Department of Mechanical Engineering and Applied MechanicsUniversity of PennsylvaniaPhiladelphiaUSA
  4. 4.Fraunhofer-Institut für Werkstoffmechanik IWMFreiburgGermany

Personalised recommendations