People | Locations | Statistics |
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Ferrari, A. |
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Schimpf, Christian |
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Dunser, M. |
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Thomas, Eric |
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Gecse, Zoltan |
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Tsrunchev, Peter |
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Della Ricca, Giuseppe |
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Cios, Grzegorz |
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Hohlmann, Marcus |
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Dudarev, A. |
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Mascagna, V. |
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Santimaria, Marco |
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Poudyal, Nabin |
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Piozzi, Antonella |
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Mørtsell, Eva Anne |
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Jin, S. |
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Noel, Cédric |
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Fino, Paolo |
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Mailley, Pascal |
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Meyer, Ernst |
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Zhang, Qi |
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Pfattner, Raphael | Brussels |
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Kooi, Bart J. |
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Babuji, Adara |
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Pauporte, Thierry |
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Dienwiebel, M.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (8/8 displayed)
- 2020Effect of environment on microstructure evolution and friction of Au-Ni multilayerscitations
- 2020Synergistic effects of antiwear and friction modifier additivescitations
- 2019Atomistic insights into lubricated tungsten/diamond sliding contactscitations
- 2017Microstructure, mechanical properties and friction behavior of magnetron-sputtered V-C coatingscitations
- 2017Analysis of the running-in of thermal spray coatings by time-dependent stribeck mapscitations
- 2014Nanoscale sliding friction phenomena at the interface of diamond-like carbon and tungstencitations
- 2014Origins of folding instabilities on polycrystalline metal surfacescitations
- 2012In situ observation of wear particle formation on lubricated sliding surfacescitations
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article
Origins of folding instabilities on polycrystalline metal surfaces
Abstract
Art. 064004 ; Wear and removal of material from polycrystalline metal surfaces is inherently connected to plastic flow. Here, plowing-induced unconstrained surface plastic flow on a nanocrystalline copper surface has been studied by massive molecular dynamics simulations and atomic force microscopy scratch experiments. In agreement with experimental findings, bulges in front of a model asperity develop into vortexlike fold patterns that mark the disruption of laminar flow. We identify dislocation-mediated plastic flow in grains with suitably oriented slip systems as the basic mechanism of bulging and fold formation. The observed folding can be fundamentally explained by the inhomogeneity of plasticity on polycrystalline surfaces which favors bulge formation on grains with suitably oriented slip system. This process is clearly distinct from Kelvin-Helmholtz instabilities in fluids, which have been previously suggested to resemble the formed surface fold patterns. The generated prow grows into a rough chip with stratified lamellae that are identified as the precursors of wear debris. Our findings demonstrate the importance of surface texture and grain structure engineering to achieve ultralow wear in metals. ; 2 ; Nr.6