Journal ArticleDOI
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 +7 more
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TLDR
In this article, the formation of a soft amorphous carbon (a-C) layer with increased sp2 content was demonstrated, which grows faster than an a-C tribolayer found on self-mated diamond sliding under similar conditions.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.read more
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Superlubricity of carbon nanostructures
Xinchun Chen,Jinjin Li +1 more
TL;DR: An overview of the state-of-the-art of nanostructured carbon-based superlubricity can be found in this paper, with a specific emphasis on unusual properties and new phenomena in representative carbon materials including layer carbon structure, diamond-like carbon, onion-like/fullerene-like carbons, ultra-nanocrystalline diamond and carbon nanotubes.
Journal ArticleDOI
Review of force fields and intermolecular potentials used in atomistic computational materials research
Judith A. Harrison,J. David Schall,Sabina Maskey,Paul T. Mikulski,M. Todd Knippenberg,Brian H. Morrow +5 more
TL;DR: In this focused review, some of the more commonly used potential energy functions for molecular simulations are reviewed with an eye toward presenting their general forms, strengths, and weaknesses.
Journal ArticleDOI
Mechano-chemical decomposition of organic friction modifiers with multiple reactive centres induces superlubricity of ta-C
Takuya Kuwahara,Pedro A. Romero,Stefan Makowski,Volker Weihnacht,Gianpietro Moras,Michael Moseler,Michael Moseler +6 more
TL;DR: Combined experiments and simulations unveil a universal tribochemical mechanism leading to superlubricity of ta-C/ta-C tribopairs, revealing thatsuperlubricious layers form due the mechano-chemical decomposition of friction modifiers.
Journal ArticleDOI
Origin of Superlubricity in a-C:H:Si Films: A Relation to Film Bonding Structure and Environmental Molecular Characteristic
TL;DR: Superlubricity of Si-containing hydrogenated amorphous carbon (a-C:H:Si) films has been systematically investigated in relation to the film bonding structure and the environmental atmosphere and hydrogen is highlighted for its decisive role in obtaining superlow friction.
Journal ArticleDOI
Structure effects of sp2-rich carbon films under super-low friction contact
TL;DR: In this paper, the role of film and rehybridized structures under super-low friction contact was discussed, and a smart device was designed to gather the transformed products under different load and sliding cycles.
References
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Journal ArticleDOI
Mechanical behavior of amorphous alloys
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