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Effect of Nb and Fe on damage evolution in a Zr-alloy during proton and neutron irradiation
Univ Manchester, Sch Mat, MSS Tower, Manchester M1 3BB, Lancs, England..
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
Univ Manchester, Sch Mat, MSS Tower, Manchester M1 3BB, Lancs, England..
Univ Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England.;Univ Bristol, Tyndall Ave, Bristol, Avon, England..
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2019 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 165, p. 603-614Article in journal (Refereed) Published
Abstract [en]

Detailed analysis was carried out on proton and a neutron irradiated Nb-containing Zr-alloy to study the evolution of dislocation loop size and densities as well as the formation and evolution of irradiation induced precipitation/clustering. The results obtained here have been contrasted against previously published work on a Nb-free Zr-alloy [1, 21 to investigate the mechanistic reason for the improved resistance to irradiation-induced growth of Nb-containing Zr alloys. The combined use of bright field scanning transmission electron microscopy, ultra-high-resolution energy dispersive spectroscopy and atom probe tomography analysis provides evidence of evenly distributed radiation-induced Nb dusters that have formed during the early stage of proton irradiation and Fe-rich nano-rods near Fe-containing second phase particles. The former seems to have a profound effect on <a> loop and subsequent <c> loop formation, keeping <a> loop size small but number density high while <c> loops seem to initially form at similar dose levels compared to a Nb-free alloy but <c> loop line density does not increase during further irradiation. It is hypothesized that the formation of the Nb nano-precipitates/clusters significantly hinders mobility and growth of <a> loops, resulting in a small size, high number density and limited ability of <a> loops to arrange along basal traces compared to Nb-free Zr-alloys. It is suggested that it is the limited <a> loop arrangement that slows down <c> loop formation and the root cause for the high resistance of Nb-containing Zr-alloys to irradiation-induced growth. 

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2019. Vol. 165, p. 603-614
Keywords [en]
Low-Sn ZIRLOrm, Atom probe tomography, TEM, Radiation induced precipitation, Clusters, Dislocation loops, Breakaway growth
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-244504DOI: 10.1016/j.actamat.2018.12.021ISI: 000457665100052Scopus ID: 2-s2.0-85058665685OAI: oai:DiVA.org:kth-244504DiVA, id: diva2:1301367
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QC 20190401

Available from: 2019-04-01 Created: 2019-04-01 Last updated: 2019-06-11Bibliographically approved

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Babu, Prasath

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