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

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• 作者：Osamu Waseda^a ; Roberto GA Veiga^b ; Julien Morthomas^a ; Patrice Chantrenne^a ; Charlotte S. Becquart^d ; Fabienne Ribeiro^c ; Andrei Jelea^c ; Helio Goldenstein^b ; Michel Perez^a ; ^{Michel.Perez@insa-lyon.fr}
• 关键词：Metropolis Monte-Carlo ; Cottrell atmospheres ; Dislocation ; Static ageing
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：1 March 2017
• 年：2017
• 卷：129
• 期：Complete
• 页码：16-19
• 全文大小：975 K
• 卷排序：129

文摘

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.