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  4. The origin of surface microstructure evolution in sliding friction
 
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2018
Journal Article
Title

The origin of surface microstructure evolution in sliding friction

Abstract
A typical tribologically induced microstructure displays a discontinuity parallel to the surface separating the near-surface layer from the bulk. Despite its ubiquitous observation, the origin of this layer underneath the surface remains elusive. Here, we show that already after the first loading pass a localized dislocation structure is found at a depth of 100150 nm. This structure is linked to the inhomogeneous stress field under the moving indenter, where dislocations are trapped when the stress drops below the material's yield stress. Control of the initial tribological loading could therefore be exploited to design surfaces and materials with superior tribological properties.
Author(s)
Greiner, C.
Institute for Applied Materials (IAM), Karlsruhe Institute of Technology (KIT),
Liu, Z.
Institute for Applied Materials (IAM), Karlsruhe Institute of Technology (KIT),
Schneider, R.
Laboratory for Electron Microscopy (LEM), Karlsruhe Institute of Technology (KIT)
Pastewka, L.
Fraunhofer-Institut für Werkstoffmechanik IWM  
Gumbsch, P.
Fraunhofer-Institut für Werkstoffmechanik IWM  
Journal
Scripta materialia  
Funder
Deutsche Forschungsgemeinschaft DFG  
Deutsche Forschungsgemeinschaft DFG  
Deutsche Forschungsgemeinschaft DFG  
Deutsche Forschungsgemeinschaft DFG  
DOI
10.1016/j.scriptamat.2018.04.048
Language
English
Fraunhofer-Institut für Werkstoffmechanik IWM  
Keyword(s)
  • friction

  • copper

  • scanning/transmission electron microscopy (STEM)

  • dislocation

  • microstructure

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