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

Dmitry Terentyev, Vyacheslav A. Ryabov, Valery A. Pechenkin, V.L. Molodtsov

    Research outputpeer-review


    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.
    Original languageEnglish
    Pages (from-to)43-46
    JournalJournal of Nuclear Materials
    StatePublished - 15 Apr 2016

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