Contribution of di-SIA to mass transport in Fe-Cr alloys

Research output: Contribution to journalArticle

Authors

Institutes & Expert groups

  • NRC - Nuclear Regulatory Commission
  • IPPE - Institute of Physics and Power Engineering - Russia

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Abstract

Molecular dynamics simulations have been performed to study the diffusion characteristics of di-self interstitial atom (di-SIA) in BCC FeeCr alloys and corresponding mass transport of Fe and Cratoms in the temperature range 600e1000 K in the alloys with Cr content 5e25 at%, which is relevant for ferritic/martensitic steels. An original treatment is proposed in this work to account for a mixed migration mode composed of the diffusion of the cluster itself and break-up into a pair of independent SIAs. The ratio of self-diffusion coefficients of Cr and Fe is found to exceed unity in Fee5Cr and Fee10Cr alloys, which implies that under cascade-producing damage, 3D-migrating small SIA clusters will effectively contribute to the segregation of Cr to neutral and SIA-preferential sinks, eventually causing radiation induced segregation.

Details

Original languageEnglish
Pages (from-to)43-46
JournalJournal of Nuclear Materials
Volume472
DOIs
Publication statusPublished - 15 Apr 2016

Keywords

  • SIA, Mass , transport, Fe-CR alloys

ID: 2179022