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• W2034647596 abstract "Molecular dynamics simulation is used to study the formation of the a(0) binary dislocation junction in body-centered cubic Fe. Results show that under an applied strain two intersecting 1/2 a(0) dislocations, one mobile edge and one immobile screw, form an a(0) binary junction of mixed character in the glide plane of the mobile edge dislocation. It appears, however, that the binary junction does not necessarily lay in one of the three possible {1 1 0} glide planes of the screw dislocation. The binary junction starts to unzip as the impinging edge dislocation bows around and moves away, which results in the formation of a screw dipole along its Burgers vector. The dipole eventually annihilates, completing the unzipping process of the junction, which liberates the edge dislocation. The effects of temperature and strain rate on the unzipping of the junction are quantified by the critical release stress needed to detach the edge dislocation from the screw one. The critical stress decreases when the temperature increases from 10 to 300 K, whereas it increases with increasing applied strain rate, or dislocation speed. The interaction mechanism and strength of the a(0) binary junction as an obstacle to the edge dislocation are compared to that of other types of defect, namely nanosized voids, Cu and Cr precipitates, and dislocation loops in Fe. It appears that the binary junction strength is in the lowest range, comparable to that of a coherent Cr precipitate. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved." @default.
• W2034647596 created "2016-06-24" @default.
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• W2034647596 date "2014-02-01" @default.
• W2034647596 modified "2023-10-03" @default.
• W2034647596 title "Atomistic simulation of the a0 〈100〉 binary junction formation and its unzipping in body-centered cubic iron" @default.
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• W2034647596 doi "https://doi.org/10.1016/j.actamat.2013.11.037" @default.
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