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Article Dans Une Revue Scripta Materialia Année : 2017

Formation of carbon Cottrell atmospheres and their effect on the stress field around an edge dislocation

Résumé

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.

Domaines

Matériaux
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Dates et versions

hal-01540075 , version 1 (15-06-2017)

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Osamu Waseda, Roberto Ga Veiga, Julien Morthomas, Patrice Chantrenne, Charlotte S Becquart, et al.. Formation of carbon Cottrell atmospheres and their effect on the stress field around an edge dislocation. Scripta Materialia, 2017, 129, pp.16--19. ⟨10.1016/j.scriptamat.2016.09.032⟩. ⟨hal-01540075⟩
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