Solute-point defect interactions, coupled ...
Document type :
Article dans une revue scientifique: Article original
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Title :
Solute-point defect interactions, coupled diffusion, and radiation-induced segregation in fcc nickel
Author(s) :
Toijer, E. [Auteur]
KTH Royal Institute of Technology [Stockholm] [KTH]
Messina, L. [Auteur]
CEA Cadarache
KTH Royal Institute of Technology [Stockholm] [KTH]
Domain, Christophe [Auteur]
Matériaux et Mécanique des Composants [EDF R&D MMC]
Vidal, J. [Auteur]
Matériaux et Mécanique des Composants [EDF R&D MMC]
Becquart, Charlotte [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Olsson, P. [Auteur]
KTH Royal Institute of Technology [Stockholm] [KTH]
KTH Royal Institute of Technology [Stockholm] [KTH]
Messina, L. [Auteur]
CEA Cadarache
KTH Royal Institute of Technology [Stockholm] [KTH]
Domain, Christophe [Auteur]
Matériaux et Mécanique des Composants [EDF R&D MMC]
Vidal, J. [Auteur]
Matériaux et Mécanique des Composants [EDF R&D MMC]
Becquart, Charlotte [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Olsson, P. [Auteur]
KTH Royal Institute of Technology [Stockholm] [KTH]
Journal title :
Physical Review Materials
Abbreviated title :
Phys. Rev. Materials
Volume number :
5
Publisher :
American Physical Society (APS)
Publication date :
2021-01-19
ISSN :
2475-9953
English keyword(s) :
defects
diffusion
irradiation effects
diffusion
irradiation effects
HAL domain(s) :
Chimie/Matériaux
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
English abstract : [en]
Radiation-induced segregation (RIS) of solutes in materials exposed to irradiation is a well-known problem.
It affects the lifetime of nuclear reactor core components by favoring radiation-induced degradation phenomena ...
Show more >Radiation-induced segregation (RIS) of solutes in materials exposed to irradiation is a well-known problem. It affects the lifetime of nuclear reactor core components by favoring radiation-induced degradation phenomena such as hardening and embrittlement. In this work, RIS tendencies in face centered cubic (fcc) Ni-X (X = Cr, Fe, Ti, Mn, Si, P) dilute binary alloys are examined. The goal is to investigate the driving forces and kinetic mechanisms behind the experimentally observed segregation. By means of ab initio calculations, point-defect stabilities and interactions with solutes are determined, together with migration energies and attempt frequencies. Transport and diffusion coefficients are then calculated in a mean-field framework, to get a full picture of solutedefect kinetic coupling in the alloys. Results show that all solutes considered, with the exception of Cr, prefer vacancy-mediated over interstitial-mediated diffusion during both thermal and radiation-induced migration. Cr, on the other hand, preferentially migrates in a mixed-dumbbell configuration. P and Si are here shown to be enriched, and Fe and Mn to be depleted at sinks during irradiation of the material. Ti and Cr, on the other hand, display a crossover between enrichment at lower temperatures, and depletion in the higher temperature range. Results in this work are compared with previous studies in body centered cubic (bcc) Fe, and discussed in the context of RIS in austenitic alloys.Show less >
Show more >Radiation-induced segregation (RIS) of solutes in materials exposed to irradiation is a well-known problem. It affects the lifetime of nuclear reactor core components by favoring radiation-induced degradation phenomena such as hardening and embrittlement. In this work, RIS tendencies in face centered cubic (fcc) Ni-X (X = Cr, Fe, Ti, Mn, Si, P) dilute binary alloys are examined. The goal is to investigate the driving forces and kinetic mechanisms behind the experimentally observed segregation. By means of ab initio calculations, point-defect stabilities and interactions with solutes are determined, together with migration energies and attempt frequencies. Transport and diffusion coefficients are then calculated in a mean-field framework, to get a full picture of solutedefect kinetic coupling in the alloys. Results show that all solutes considered, with the exception of Cr, prefer vacancy-mediated over interstitial-mediated diffusion during both thermal and radiation-induced migration. Cr, on the other hand, preferentially migrates in a mixed-dumbbell configuration. P and Si are here shown to be enriched, and Fe and Mn to be depleted at sinks during irradiation of the material. Ti and Cr, on the other hand, display a crossover between enrichment at lower temperatures, and depletion in the higher temperature range. Results in this work are compared with previous studies in body centered cubic (bcc) Fe, and discussed in the context of RIS in austenitic alloys.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Internationale
Popular science :
Non
Administrative institution(s) :
Université de Lille
CNRS
INRA
ENSCL
CNRS
INRA
ENSCL
Collections :
Research team(s) :
Métallurgie Physique et Génie des Matériaux
Submission date :
2021-01-20T10:09:10Z
2021-01-21T10:26:12Z
2021-01-21T10:26:12Z
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