The effect of rhenium on the diffusion of small interstitial clusters in tungsten

Research output: Contribution to journalArticle

Institutes & Expert groups

  • CEA Saclay - Commissariat à l'énergie atomique
  • KTH - Royal Institute of Technology

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Abstract

In this work, we use atomistic simulations to investigate the mobility and stability of self-interstitial atom (SIA) clusters of size 1–5 in W-Re alloys. We apply molecular statics and molecular dynamics (MD) simulations to determine the dimensionality of diffusion of the clusters, the activation energy of translation and rotation, and the energy of dissociation. The results show a strong effect of Re on the diffusion properties of SIA clusters, but not on its stability. The diffusion mechanism of the single SIA changes from 1-D migration with on-site rotations to full 3-D diffusion on the MD time and length scale due to the addition of Re. Further, the mobility of the SIA clusters is greatly reduced by the addition of Re. The obtained results can be readily used to parameterize coarse grain models such as object kinetic Monte Carlo and rate theory models.

Details

Original languageEnglish
Article number109580
Pages (from-to)1-7
Number of pages7
JournalComputational Materials Science
Volume177
Publication statusPublished - May 2020

Keywords

  • Tungsten, Self-interstitial cluster, Diffusion, Dissociation, Object kinetic Monte Carlo, molecular dynamics

ID: 6030486