Competing processes in reactions between an edge dislocation and dislocation loops in a body-centred cubic metal

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Abstract

Molecular dynamics simulation was used to investigate reactions of a 1/2 {110} edge dislocation with interstitial dislocation loops of 1/2 and type in a model of iron. Whether loops are strong or weak obstacles depends not only on loop size and type, but also on temperature and dislocation velocity. These parameters determine whether a loop is absorbed on the dislocation or left behind as it glides away. Absorption requires glide of a reaction segment over the loop surface and cross-slip of dipole dislocation arms attached to the ends of the segment: these mechanisms depend on temperature and strain rate, as discussed here.

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Original languageEnglish
Pages (from-to)697-700
JournalScripta Materialia
Volume62
Issue number9
DOIs
Publication statusPublished - 1 Feb 2010

Keywords

  • Edge dislocation, Dislocation loop, Molecular dynamics, Iron

ID: 146199