Effect of Cr content on the nanostructural evolution of irradiated ferritic/martensitic alloys: An object kinetic Monte Carlo model

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Effect of Cr content on the nanostructural evolution of irradiated ferritic/martensitic alloys: An object kinetic Monte Carlo model. / Chiapetto, Monica; Malerba, Lorenzo; Becquart, Charlotte; Terentyev, Dmitry (Peer reviewer).

In: Journal of Nuclear Materials, Vol. 465, No. 2015, 06.2015, p. 326-336.

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@article{068b75e7203c40539fe180d466411067,
title = "Effect of Cr content on the nanostructural evolution of irradiated ferritic/martensitic alloys: An object kinetic Monte Carlo model",
abstract = "Self-interstitial cluster diffusivity in Fe-Cr alloys is known to be reduced in a non-monotonic way as a function of Cr concentration. This non-monotonic behaviour correlates well with the experimentally observed swelling in these alloys, under comparable irradiation conditions. Moreover, recent studies reveal that C atoms dispersed in the Fe matrix form under irradiation complexes with vacancies which, in turn, act as trap for onedimensionally migrating self-interstitial clusters. The mobility of one-dimensional migrating clusters is considered key to determine swelling susceptibility. In this work we developed physically-based sets of parameters for object kinetic Monte Carlo simulations intended to study the nanostructure evolution under irradiation in Fe-Cr-C alloys, neutron irradiated up to ~0.6 dpa at 563 K. Our model shows that the SIA cluster reduced mobility has a major influence on the nanostructural evolution: it increases the number of vacancy-SIA recombinations and thus leads to the suppression of voids formation. This provides a clear framework to interpret the non-monotonic dependence of swelling in Fe-Cr alloys versus Cr content. Our model also suggests that the amount of C in the matrix has an equally important role: high amounts of it may counteract the beneficial effect that Cr has in reducing swelling.",
keywords = "Object kinetic Monte Carlo, Neutron irradiation, Nanostructural evolution, FeCr, Martensitic alloys",
author = "Monica Chiapetto and Lorenzo Malerba and Charlotte Becquart and Dmitry Terentyev",
note = "Score = 10",
year = "2015",
month = "6",
doi = "10.1016/j.jnucmat.2015.06.012",
language = "English",
volume = "465",
pages = "326--336",
journal = "Journal of Nuclear Materials",
issn = "0022-3115",
publisher = "Elsevier",
number = "2015",

}

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TY - JOUR

T1 - Effect of Cr content on the nanostructural evolution of irradiated ferritic/martensitic alloys: An object kinetic Monte Carlo model

AU - Chiapetto, Monica

AU - Malerba, Lorenzo

AU - Becquart, Charlotte

A2 - Terentyev, Dmitry

N1 - Score = 10

PY - 2015/6

Y1 - 2015/6

N2 - Self-interstitial cluster diffusivity in Fe-Cr alloys is known to be reduced in a non-monotonic way as a function of Cr concentration. This non-monotonic behaviour correlates well with the experimentally observed swelling in these alloys, under comparable irradiation conditions. Moreover, recent studies reveal that C atoms dispersed in the Fe matrix form under irradiation complexes with vacancies which, in turn, act as trap for onedimensionally migrating self-interstitial clusters. The mobility of one-dimensional migrating clusters is considered key to determine swelling susceptibility. In this work we developed physically-based sets of parameters for object kinetic Monte Carlo simulations intended to study the nanostructure evolution under irradiation in Fe-Cr-C alloys, neutron irradiated up to ~0.6 dpa at 563 K. Our model shows that the SIA cluster reduced mobility has a major influence on the nanostructural evolution: it increases the number of vacancy-SIA recombinations and thus leads to the suppression of voids formation. This provides a clear framework to interpret the non-monotonic dependence of swelling in Fe-Cr alloys versus Cr content. Our model also suggests that the amount of C in the matrix has an equally important role: high amounts of it may counteract the beneficial effect that Cr has in reducing swelling.

AB - Self-interstitial cluster diffusivity in Fe-Cr alloys is known to be reduced in a non-monotonic way as a function of Cr concentration. This non-monotonic behaviour correlates well with the experimentally observed swelling in these alloys, under comparable irradiation conditions. Moreover, recent studies reveal that C atoms dispersed in the Fe matrix form under irradiation complexes with vacancies which, in turn, act as trap for onedimensionally migrating self-interstitial clusters. The mobility of one-dimensional migrating clusters is considered key to determine swelling susceptibility. In this work we developed physically-based sets of parameters for object kinetic Monte Carlo simulations intended to study the nanostructure evolution under irradiation in Fe-Cr-C alloys, neutron irradiated up to ~0.6 dpa at 563 K. Our model shows that the SIA cluster reduced mobility has a major influence on the nanostructural evolution: it increases the number of vacancy-SIA recombinations and thus leads to the suppression of voids formation. This provides a clear framework to interpret the non-monotonic dependence of swelling in Fe-Cr alloys versus Cr content. Our model also suggests that the amount of C in the matrix has an equally important role: high amounts of it may counteract the beneficial effect that Cr has in reducing swelling.

KW - Object kinetic Monte Carlo

KW - Neutron irradiation

KW - Nanostructural evolution

KW - FeCr

KW - Martensitic alloys

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_139794

UR - http://knowledgecentre.sckcen.be/so2/bibref/12783

U2 - 10.1016/j.jnucmat.2015.06.012

DO - 10.1016/j.jnucmat.2015.06.012

M3 - Article

VL - 465

SP - 326

EP - 336

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

IS - 2015

ER -

ID: 71291