Phase constituents of Al-rich U-Mo-Al alloys examined by transmission electron microscopy

    Authors

    E. Perez; A. Ewh; J. Liu; B. Yuan; D. D. Keiser;Y. H. Sohn

    Comments

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    Abbreviated Journal Title

    J. Nucl. Mater.

    Keywords

    DISPERSION FUEL; DIFFUSION COUPLES; INTERACTION LAYER; IRRADIATION; BEHAVIOR; LOW-TEMPERATURE; URANIUM; ALUMINUM; GROWTH; SYSTEM; INTERDIFFUSION; Materials Science, Multidisciplinary; Nuclear Science & Technology; Mining & Mineral Processing

    Abstract

    To supplement the understanding of diffusional interactions involving Al-rich region of the U-Mo-Al system, alloys with composition 85.7Al-11.44U-2.86Mo and 87.5Al-10U-2.5Mo in at.%, were examined to determine the equilibrium phase constituents at 500 degrees C. These alloys were triple arc-melted, homogenized at 500 degrees C for 200 h, and water-quenched to preserve the high temperature microstructure. X-ray diffraction, scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (XEDS). and transmission electron microscopy (TEM) with high angle annular dark field (HAADF) imaging via scanning transmission electron microscopy (STEM) were employed for the characterization. Alloy specimens for TEM/STEM were prepared using site-specific focused ion beam (FIB) in situ lift-out (INLO) technique. Despite the homogenization time and temperature, five different phases, namely fcc-Al solid solution, cubic-UAl(3), orthorhombic-UAl(4), hexagonal-U(6)Mo(4)Al(43) and diamond cubiC-UMo(2)Al(20), were observed. Based on U-Al, U-Mo and Al-Mo binary phase diagrams, previously proposed U-Mo-Al isotherms, and the solidification microstructure of these alloys, the Al-rich region of the equilibrium ternary isotherm at 500 degrees C was constructed. The fcc-Al solid solution, orthorhombic-UAl(4), and diamond cubic-UMo(2)Al(20) which were determined to be the equilibrium phases in 85.7Al-11.44U-2.86Mo and 87.5Al-10U-2.5Mo alloys. (C) 2009 Elsevier B.V. All rights reserved.

    Journal Title

    Journal of Nuclear Materials

    Volume

    394

    Issue/Number

    2-3

    Publication Date

    1-1-2009

    Document Type

    Article

    Language

    English

    First Page

    160

    Last Page

    165

    WOS Identifier

    WOS:000272780600007

    ISSN

    0022-3115

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