Effect of sink strength dispersion on cluster size distributions simulated by cluster dynamics

JOURNAL OF NUCLEAR MATERIALS

卷:533

Article

Carpentier, D.¹  Jourdan, T.¹  Terrier, P.^1,2  Athenes, M.¹  Le Bouar, Y.³ 

[1] Univ Paris Saclay, CEA, DEN Serv Rech Met Phys, F-91191 Gif Sur Yvette, France

[2] Univ Paris Est, INRIA, CERMICS ENPC, F-77455 Marne La Vallee, France

[3] Univ Paris Saclay, CNRS, ONERA, LEM, 29 Av Div Leclerc, Chatillon 92322, France

关键词: Cluster dynamics;    Object kinetic Monte Carlo;    Diffusional interactions;    Spatial correlations;   

DOI  :  10.1016/j.jnucmat.2020.152068

来源: Elsevier

【 摘 要 】

The microstructure evolution in irradiated materials can be conveniently modelled, at large scale, by cluster dynamics (CD). In this approach, the effect of the local environment of defect clusters is neglected. In this article, we first check the validity of this assumption by comparing CD to object kinetic Monte Carlo (OKMC) simulations. We show that for microstructures produced under irradiation, taking into account in CD only the average dependency of clusters' growth rate on volume fraction does not permit to reproduce reference OKMC results. Accordingly, the sink strength dispersion, quantified using OKMC, is introduced in CD, using a new formalism depending on the Voronoi volumes of defect clusters. CD calculations including sink strength dispersion are shown to be in better agreement with reference OKMC simulations and experimental observations than are classical CD calculations. (c) 2020 Elsevier B.V. All rights reserved.

【 授权许可】

Free