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The origin of surface microstructure evolution in sliding friction

 
: Greiner, C.; Liu, Z.; Schneider, R.; Pastewka, L.; Gumbsch, P.

:

Scripta materialia 153 (2018), S.63-67
ISSN: 1359-6462
Deutsche Forschungsgemeinschaft DFG
Gr 4174/1
Deutsche Forschungsgemeinschaft DFG
Pa 2023/2
Deutsche Forschungsgemeinschaft DFG
Gu 367/30
Deutsche Forschungsgemeinschaft DFG
INST 121384/21-1
Englisch
Zeitschriftenaufsatz
Fraunhofer IWM ()
friction; copper; scanning/transmission electron microscopy (STEM); dislocation; microstructure

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.

: http://publica.fraunhofer.de/dokumente/N-531037.html