Effects of Cr and Ni on interdiffusion and reaction between U and Fe-Cr-Ni alloys

    Authors

    K. Huang; Y. Park; L. Zhou; K. R. Coffey; Y. H. Sohn; B. H. Sencer;J. R. Kennedy

    Comments

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    Abbreviated Journal Title

    J. Nucl. Mater.

    Keywords

    ZR FUEL; DIFFUSION; Materials Science, Multidisciplinary; Nuclear Science & Technology; Mining & Mineral Processing

    Abstract

    Metallic U-alloy fuel cladded in steel has been examined for high temperature fast reactor technology wherein the fuel cladding chemical interaction is a challenge that requires a fundamental and quantitative understanding. In order to study the fundamental diffusional interactions between U with Fe and the alloying effect of Cr and Ni, solid-to-solid diffusion couples were assembled between pure U and Fe, Fe-15 wt.%Cr or Fe-15 wt.%Cr-15 wt.%Ni alloy, and annealed at high temperature ranging from 580 to 700 degrees C. The microstructures and concentration profiles that developed from the diffusion anneal were examined by scanning electron microscopy, and X-ray energy dispersive spectroscopy (XEDS), respectively. Thick U6Fe and thin UFe2 phases were observed to develop with solubilities: up to 2.5 at.% Ni in U-6(Fe,Ni), up to 20 at.%Cr in U(Fe, Cr)(2), and up to 7 at.%Cr and 14 at.% Ni in U(Fe, Cr, Ni)(2). The interdiffusion and reactions in the U vs. Fe and U vs. Fe-Cr-Ni exhibited a similar temperature dependence, while the U vs. Fe-Cr diffusion couples, without the presence of Ni, yielded greater activation energy for the growth of intermetallic phases - lower growth rate at lower temperature but higher growth rate at higher temperature. (C) 2014 Elsevier B.V. All rights reserved.

    Journal Title

    Journal of Nuclear Materials

    Volume

    451

    Issue/Number

    1-3

    Publication Date

    1-1-2014

    Document Type

    Article

    Language

    English

    First Page

    372

    Last Page

    378

    WOS Identifier

    WOS:000338618600048

    ISSN

    0022-3115

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