Cr segregation on dislocation loops enhances hardening in ferritic Fe–Cr alloys

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Cr segregation on dislocation loops enhances hardening in ferritic Fe–Cr alloys. / Terentyev, Dmitry; Bergner, F.; Osetsky, Y.; Bonny, Giovanni (Peer reviewer).

In: Acta Materialia, Vol. 61, No. 5, 03.2013, p. 1444-1453.

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Terentyev, Dmitry ; Bergner, F. ; Osetsky, Y. ; Bonny, Giovanni. / Cr segregation on dislocation loops enhances hardening in ferritic Fe–Cr alloys. In: Acta Materialia. 2013 ; Vol. 61, No. 5. pp. 1444-1453.

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@article{94dbbf1d642d4d4b8c674f66dfbe9b01,
title = "Cr segregation on dislocation loops enhances hardening in ferritic Fe–Cr alloys",
abstract = "The effect of chromium on iron hardening via segregation on dislocation loops was studied by atomic scale computer modeling. A combination of Monte Carlo and molecular dynamics techniques together with the recently determined Fe–Cr interatomic potentials fitted to ab initio data was used to investigate Cr segregation on ½〈1 1 1〉 interstitial dislocation loops and its impact on the interaction with moving dislocations. The Monte Carlo results reveal that Cr atoms segregate to the loop tensile strain region and dissolve well above the temperature corresponding to the solubility limit. The molecular dynamics results demonstrated that local micro-chemical changes near the loop reduce its mobility and increase the strength. The stress to move a dislocation through the array of Cr “decorated” loops increases due to modification of the dislocation–loop interaction mechanism. A possible explanation for a number of experimental observations being dependent on the radiation dose and for Cr concentration effects on the yield stress is given on the basis of the modeling results.",
keywords = "Bcc metals, Dislocation loops, Hardening, Segregation",
author = "Dmitry Terentyev and F. Bergner and Y. Osetsky and Giovanni Bonny",
note = "Score = 10",
year = "2013",
month = mar,
doi = "10.1016/j.actamat.2012.11.021",
language = "English",
volume = "61",
pages = "1444--1453",
journal = "Acta Materialia",
issn = "1359-6454",
publisher = "Elsevier",
number = "5",

}

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TY - JOUR

T1 - Cr segregation on dislocation loops enhances hardening in ferritic Fe–Cr alloys

AU - Terentyev, Dmitry

AU - Bergner, F.

AU - Osetsky, Y.

A2 - Bonny, Giovanni

N1 - Score = 10

PY - 2013/3

Y1 - 2013/3

N2 - The effect of chromium on iron hardening via segregation on dislocation loops was studied by atomic scale computer modeling. A combination of Monte Carlo and molecular dynamics techniques together with the recently determined Fe–Cr interatomic potentials fitted to ab initio data was used to investigate Cr segregation on ½〈1 1 1〉 interstitial dislocation loops and its impact on the interaction with moving dislocations. The Monte Carlo results reveal that Cr atoms segregate to the loop tensile strain region and dissolve well above the temperature corresponding to the solubility limit. The molecular dynamics results demonstrated that local micro-chemical changes near the loop reduce its mobility and increase the strength. The stress to move a dislocation through the array of Cr “decorated” loops increases due to modification of the dislocation–loop interaction mechanism. A possible explanation for a number of experimental observations being dependent on the radiation dose and for Cr concentration effects on the yield stress is given on the basis of the modeling results.

AB - The effect of chromium on iron hardening via segregation on dislocation loops was studied by atomic scale computer modeling. A combination of Monte Carlo and molecular dynamics techniques together with the recently determined Fe–Cr interatomic potentials fitted to ab initio data was used to investigate Cr segregation on ½〈1 1 1〉 interstitial dislocation loops and its impact on the interaction with moving dislocations. The Monte Carlo results reveal that Cr atoms segregate to the loop tensile strain region and dissolve well above the temperature corresponding to the solubility limit. The molecular dynamics results demonstrated that local micro-chemical changes near the loop reduce its mobility and increase the strength. The stress to move a dislocation through the array of Cr “decorated” loops increases due to modification of the dislocation–loop interaction mechanism. A possible explanation for a number of experimental observations being dependent on the radiation dose and for Cr concentration effects on the yield stress is given on the basis of the modeling results.

KW - Bcc metals

KW - Dislocation loops

KW - Hardening

KW - Segregation

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_136508

UR - http://knowledgecentre.sckcen.be/so2/bibref/11748

U2 - 10.1016/j.actamat.2012.11.021

DO - 10.1016/j.actamat.2012.11.021

M3 - Article

VL - 61

SP - 1444

EP - 1453

JO - Acta Materialia

JF - Acta Materialia

SN - 1359-6454

IS - 5

ER -

ID: 311878