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

D. Terentyev; Yu N. Osetsky; D. J. Bacon

doi:10.1016/j.scriptamat.2010.01.034

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

D. Terentyev, Yu N. Osetsky, D. J. Bacon

Microstructural Evolution Modeling

Research output: Contribution to journal › Article › peer-review

65 Scopus citations

Abstract

Molecular dynamics simulation was used to investigate reactions of a frac(1, 2) 〈 1 1 1 〉 {1 1 0} edge dislocation with interstitial dislocation loops of frac(1, 2) 〈 1 1 1 〉 and 〈1 0 0〉 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.

Original language	English
Pages (from-to)	697-700
Number of pages	4
Journal	Scripta Materialia
Volume	62
Issue number	9
DOIs	https://doi.org/10.1016/j.scriptamat.2010.01.034
State	Published - May 2010

Funding

This work was performed in the framework of the 7th Framework Programme collaborative project GETMAT (Grant agreement No. 212175 ) and partially supported by the European Commission; and by the Division of Materials Sciences and Engineering, US Department of Energy under contract with UT-Battelle, LLC (Y.O.).

Funders	Funder number
US Department of Energy
Seventh Framework Programme	212175
Division of Materials Sciences and Engineering
European Commission

Keywords

Dislocation loop
Edge dislocation
Iron
Molecular dynamics

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10.1016/j.scriptamat.2010.01.034

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abstract = "Molecular dynamics simulation was used to investigate reactions of a frac(1, 2) 〈 1 1 1 〉 {1 1 0} edge dislocation with interstitial dislocation loops of frac(1, 2) 〈 1 1 1 〉 and 〈1 0 0〉 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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AU - Bacon, D. J.

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N2 - Molecular dynamics simulation was used to investigate reactions of a frac(1, 2) 〈 1 1 1 〉 {1 1 0} edge dislocation with interstitial dislocation loops of frac(1, 2) 〈 1 1 1 〉 and 〈1 0 0〉 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.

AB - Molecular dynamics simulation was used to investigate reactions of a frac(1, 2) 〈 1 1 1 〉 {1 1 0} edge dislocation with interstitial dislocation loops of frac(1, 2) 〈 1 1 1 〉 and 〈1 0 0〉 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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Competing processes in reactions between an edge dislocation and dislocation loops in a body-centred cubic metal

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