Journal
INTERNATIONAL JOURNAL OF PLASTICITY
Volume 62, Issue -, Pages 34-49Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2014.06.006
Keywords
Dislocations; Impurities; Strengthening mechanisms; Crystal plasticity; Numerical algorithms
Funding
- EC [232612]
- Spanish Ministry of Science and Innovation [FIS2012-39443-C02-02]
- Catalan Government [CIRIT 2009SGR 1003]
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The role of interstitial carbon impurities on the dislocation glide in bcc iron is investigated by means of molecular dynamics simulations. The local stress induced by carbon atoms, interaction energy map for the a(0)/2 < 111 >{110} and a(0)/2 < 111 >{112} edge dislocations and the dynamics of dislocation carbon interaction is assessed. The local stress exerted on the dislocation due to the carbon atoms and computed by atomistic simulations is used to describe the interaction strength on the continuum level. The derived here analysis of the atomistic data enabled the determination of the activation enthalpy and volume as a function of stress. Having that information, a comparative study demonstrates that at finite temperature, the resistance to the dislocation glide induced by the carbon atoms is lower in {112} than in {110} slip systems. (C) 2014 Elsevier Ltd. All rights reserved.
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