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  4. Wear, plasticity, and rehybridization in tetrahedral amorphous carbon
 
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2014
Journal Article
Titel

Wear, plasticity, and rehybridization in tetrahedral amorphous carbon

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 sp3RT sp2 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 sp3RT sp2 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.
Author(s)
Kunze, T.
Posselt, M.
Gemming, S.
Seifert, G.
Konicek, A.
Carpick, R.
Pastewka, L.
Moseler, M.
Zeitschrift
Tribology letters
Project(s)
Topography Evolution
Funder
European Commission EC
DOI
10.1007/s11249-013-0250-7
File(s)
N-287298.pdf (1.92 MB)
Language
English
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Fraunhofer-Institut für Werkstoffmechanik IWM
Tags
  • wear

  • plasticity

  • rehybridization

  • ta-C

  • tribology

  • diamond-like carbon

  • molecular-dynamics si...

  • thin-films

  • deformation

  • tribochemistry

  • tribology

  • mechanism

  • behavior

  • failure

  • growth

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