Microstructural examination of zirconium alloys following in-pile creep testing in the HALDEN reactor

Ken R. Anderson (Corresponding Author), Wade Karlsen, Mykola Ivanchenko, Jesse J. Carter, Richard W. Smith

    Research output: Contribution to journalArticleScientificpeer-review

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    Post-irradiation examination (PIE) in the form of transmission electron microscopy (TEM) was used to characterize the microstructure of several specimens of Zircaloy-2 and Zircaloy-2 plus 1% Nb that had previously underwent in-pile creep testing in the HALDEN reactor. The purpose of the examination was to explore a microstructural basis for an apparent substantially increased rate of hardening over that observed with similar materials in the higher fast-flux environments of the ATR or HFIR, and to investigate the increased creep strength exhibited by the Nb-containing alloy relative to pure Zircaloy-2. The analysis of irradiation-induced defects indicated a higher than expected density, which was consistent with the observed high hardening rate. Modeling based on mean field rate theory suggests the lower neutron flux in the HALDEN reactor results in a higher fraction of irradiation-induced defects being available for sink (loop) nucleation and growth.
    Original languageEnglish
    Pages (from-to)260-270
    JournalJournal of Nuclear Materials
    Publication statusPublished - Jan 2019
    MoE publication typeA1 Journal article-refereed


    • In-pile creep
    • Microstructure
    • Neutron-irradiated
    • Rate-theory
    • Zircaloy-2


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