Formation of carbon Cottrell atmospheres and their effect on the stress field around an edge dislocation. (1st March 2017)

• Record Type: Journal Article
• Authors: Waseda, Osamu; Veiga, Roberto GA; Morthomas, Julien; Chantrenne, Patrice; Becquart, Charlotte S.; Ribeiro, Fabienne; Jelea, Andrei; Goldenstein, Helio; Perez, Michel
• Is Part Of: Scripta materialia. Volume 129(2017)
• Page Start: 16
• Page End: 19
• Publication Date: 2017-03-01
• Subjects: Metropolis Monte-Carlo -- Cottrell atmospheres -- Dislocation -- Static ageing; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2016.09.032
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Biased Metropolis Monte-Carlo is employed to build a carbon Cottrell atmosphere around an edge dislocation. A novel method involving only local minimisation during the Metropolis scheme allows to deal with a million-atom system within a reasonable computation time. In this study, it is discovered that (i) the carbon atoms occupy interstitial sites not only in the traction zone, but also in the compression zone; (ii) local carbon concentrations of approximately 10at% are in good agreement with experimental values; (iii) the saturation of the Cottrell atmosphere does not originate from the stress-field around the atmosphere but from repulsive carbon-carbon interactions only. Graphical Abstract: