Radiation effects on interface reactions of U/Fe, U/(Fe plus Cr), and U/(Fe plus Cr plus Ni)

    Authors

    L. Shao; D. Chen; C. C. Wei; M. S. Martin; X. M. Wang; Y. Park; E. Dein; K. R. Coffey; Y. Sohn; B. H. Sencer;J. R. Kennedy

    Comments

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    Abbreviated Journal Title

    J. Nucl. Mater.

    Keywords

    MECHANICAL-PROPERTIES; STEEL; INTERDIFFUSION; TANTALUM; ALLOY; FE; Materials Science, Multidisciplinary; Nuclear Science & Technology; Mining & Mineral Processing

    Abstract

    We study the effects of radiation damage on interdiffusion and intermetallic phase formation at the interfaces of U/Fe, U/(Fe + Cr), and U/(Fe + Cr + Ni) diffusion couples. Magnetron sputtering is used to deposit thin films of Fe, Fe + Cr, or Fe + Cr + Ni on U substrates to form the diffusion couples. One set of samples are thermally annealed under high vacuum at 450 degrees C or 550 degrees C for one hour. A second set of samples are annealed identically but with concurrent 3.5 MeV Fe++ ion irradiation. The Fe++ ion penetration depth is sufficient to reach the original interfaces. Rutherford backscattering spectrometry analysis with high fidelity spectral simulations is used to obtain interdiffusion profiles, which are used to examine differences in U diffusion and intermetallic phase formation at the buried interfaces. For all three diffusion systems, Fe++ ion irradiations enhance U diffusion. Furthermore, the irradiations accelerate the formation of intermetallic phases. In U/Fe couples, for example, the unirradiated samples show typical interdiffusion governed by Fick's laws, while the irradiated ones show step-like profiles influenced by Gibbs phase rules. (C) 2014 Elsevier B.V. All rights reserved.

    Journal Title

    Journal of Nuclear Materials

    Volume

    456

    Publication Date

    1-1-2015

    Document Type

    Article

    Language

    English

    First Page

    302

    Last Page

    310

    WOS Identifier

    WOS:000347274500039

    ISSN

    0022-3115

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