Hardening due to dislocation loop damage in RPV model alloys: Role of Mn segregation

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Hardening due to dislocation loop damage in RPV model alloys: Role of Mn segregation. / Terentyev, Dmitry; Bonny, Giovanni; Bakaev, Alexander; Zhurkin, Evgeni E.; Malerba, Lorenzo.

In: Journal of Nuclear Materials, Vol. 457, 14.02.2015, p. 173-181.

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@article{f2fa6a5c462844d3898ebb7a68f45ff3,
title = "Hardening due to dislocation loop damage in RPV model alloys: Role of Mn segregation",
abstract = "The exact nature of the radiation defects causing hardening in reactor vessel pressure steels at high doses is not yet clearly determined. While generally it is attributed to solute-rich clusters (precipitates) and point defects clusters (matrix damage), recent fine-scale experiments and atomistic simulations suggest that solute rich clusters, mainly containing Mn, Ni and Cu, might be the result of the segregation of these elements to small dislocation loops (heterogeneous nucleation), so that the distinction between precipitates and matrix damage becomes blurred. Here, we perform an atomistic study to investigate the interaction of a0/2h111i dislocation loops with moving dislocations and specifically address the effect of solute segregation on the loop’s strength and interaction mechanism, focusing in particular on Mn, alone or with other crucial solute elements such as Cu and Ni. It is found that the enrichment of Mn in the core of dislocation loops causes significant increase of the unpinning stress, especially for small, invisible ones. At the same time, the solute segregation at the dislocation loops enhances their resistance against absorption by moving dislocations.",
keywords = "dislocation loop damage, RPV model alloys, Mn segregation",
author = "Dmitry Terentyev and Giovanni Bonny and Alexander Bakaev and Zhurkin, {Evgeni E.} and Lorenzo Malerba",
note = "Score=10",
year = "2015",
month = "2",
day = "14",
doi = "10.1016/j.jnucmat.2014.11.023",
language = "English",
volume = "457",
pages = "173--181",
journal = "Journal of Nuclear Materials",
issn = "0022-3115",
publisher = "Elsevier",

}

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TY - JOUR

T1 - Hardening due to dislocation loop damage in RPV model alloys: Role of Mn segregation

AU - Terentyev, Dmitry

AU - Bonny, Giovanni

AU - Bakaev, Alexander

AU - Zhurkin, Evgeni E.

AU - Malerba, Lorenzo

N1 - Score=10

PY - 2015/2/14

Y1 - 2015/2/14

N2 - The exact nature of the radiation defects causing hardening in reactor vessel pressure steels at high doses is not yet clearly determined. While generally it is attributed to solute-rich clusters (precipitates) and point defects clusters (matrix damage), recent fine-scale experiments and atomistic simulations suggest that solute rich clusters, mainly containing Mn, Ni and Cu, might be the result of the segregation of these elements to small dislocation loops (heterogeneous nucleation), so that the distinction between precipitates and matrix damage becomes blurred. Here, we perform an atomistic study to investigate the interaction of a0/2h111i dislocation loops with moving dislocations and specifically address the effect of solute segregation on the loop’s strength and interaction mechanism, focusing in particular on Mn, alone or with other crucial solute elements such as Cu and Ni. It is found that the enrichment of Mn in the core of dislocation loops causes significant increase of the unpinning stress, especially for small, invisible ones. At the same time, the solute segregation at the dislocation loops enhances their resistance against absorption by moving dislocations.

AB - The exact nature of the radiation defects causing hardening in reactor vessel pressure steels at high doses is not yet clearly determined. While generally it is attributed to solute-rich clusters (precipitates) and point defects clusters (matrix damage), recent fine-scale experiments and atomistic simulations suggest that solute rich clusters, mainly containing Mn, Ni and Cu, might be the result of the segregation of these elements to small dislocation loops (heterogeneous nucleation), so that the distinction between precipitates and matrix damage becomes blurred. Here, we perform an atomistic study to investigate the interaction of a0/2h111i dislocation loops with moving dislocations and specifically address the effect of solute segregation on the loop’s strength and interaction mechanism, focusing in particular on Mn, alone or with other crucial solute elements such as Cu and Ni. It is found that the enrichment of Mn in the core of dislocation loops causes significant increase of the unpinning stress, especially for small, invisible ones. At the same time, the solute segregation at the dislocation loops enhances their resistance against absorption by moving dislocations.

KW - dislocation loop damage

KW - RPV model alloys

KW - Mn segregation

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/26871116

U2 - 10.1016/j.jnucmat.2014.11.023

DO - 10.1016/j.jnucmat.2014.11.023

M3 - Article

VL - 457

SP - 173

EP - 181

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

ER -

ID: 3368166