Abstract
The next generation of nuclear materials must withstand severe operating conditions including high temperatures and irradiation exposure. Oxide dispersion strengthened steels, especially 14YWT, have shown promise as a durable material under these conditions. Understanding the irradiation-enhanced creep of structural components is fundamental to evaluating their suitability for applications in reactor environments. Ion irradiations can be used to expedite irradiation testing, but they have a restricted depth of penetration, limiting the characterization of changes to the material’s properties. Small-scale mechanical testing combined with ion beam irradiations has the potential to evaluate the irradiation-enhanced creep of materials. In this study, in-situ transmission electron microscopy nanopillar creep studies on 14YWT were performed with simultaneous ion beam irradiation. The irradiation increases the measured strain rate by an order of magnitude. Variable temperature ex-situ nanoindentation creep studies were performed between room temperature and 1073 K on control samples of 14YWT; observations indicated that there was a change in the deformation mechanism between 873 K and 1073 K, which agrees well with macro-scale mechanical testing. These results validate continued research into applying these meso-scale testing techniques to nuclear materials in the future.
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This manuscript has been authored by Battelle Energy Alliance, LLC under Contract No. DE-AC07-05ID14517 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a nonexclusive, royalty-free, paid-up, irrevocable, world-wide license to publish or reproduce the published from of this manuscript, or allow others to do so, for United States Government purposes.
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The authors would like to thank NSUF RTE proposal 1648 for funding the research at the Ion Beam Lab at Sandia National Laboratories. In addition, David Frazer would like to thank the Seaborg postdoctoral fellowship for funding. This work was performed, in part, at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science. Sandia National Laboratories is a multi-mission laboratory managed and operated by National Technology & Engineering Solutions of Sandia, LLC, a wholly owned subsidiary of Honeywell International, Inc., for the U.S. DOE’s National Nuclear Security Administration under contract DE-NA-0003525. The views expressed in the article do not necessarily represent the views of the U.S. DOE or the United States Government. Work supported through the INL Laboratory Directed Research& Development (LDRD) Program under DOE Idaho Operations Office Contract DE-AC07-05ID14517.
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DF: conceptualization, methodology, investigation, resources, writing—original draft preparation, funding acquisition RJP: methodology, investigation, writing—review and editing KH: methodology, investigation, writing—review and editing, supervision TAS: investigation, resources, writing—review and editing, funding acquisition SAM: investigation, resources, writing—review and editing JTW: methodology, investigation, resources, writing—review and editing, funding acquisition. All authors have read and agreed to the published version of the manuscript.
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Frazer, D., Parrish, R.J., Hattar, K. et al. Small Scale Creep Testing of 14YWT via In-situ Transmission Electron Microscopy Irradiation and Nanoindentation. JOM 75, 2451–2461 (2023). https://doi.org/10.1007/s11837-023-05752-3
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DOI: https://doi.org/10.1007/s11837-023-05752-3