Journal
TRIBOLOGY LETTERS
Volume 53, Issue 1, Pages 119-126Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11249-013-0250-7
Keywords
Wear; Plasticity; Rehybridization; ta-C; Tribology
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Funding
- European Center for Emerging Materials and Processes (ECEMP)
- European Union
- Free State of Saxony [13857/2379]
- Air Force Office of Scientific Research [FA2386-11-1-4105 AOARD]
- UPenn MRSEC Program of the National Science Foundation [DMR11-20901]
- European Commission [Marie-Curie IOF 272619]
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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 sp(2) content, which grows faster than an a-C tribolayer found on self-mated diamond sliding under similar conditions. The faster 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 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.
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