Bubble Microstructures in Helium Injected Palladium Foils

    Published: Jan 2004

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    Microstructural characterization of helium bubble distributions is provided for a series of palladium foils that were injected with 3He under varying conditions of dose, temperature and starting foil condition. Specimens were prepared in cross section and bubble layers ∼500 nm thick are found starting ∼300 nm from foil surfaces. Bubble densities and sizes were found to vary with foil microstructure and injection conditions, with larger bubbles formed on microstructural features such as sub-grain boundaries and nearer the surface. Most surprisingly, bubble sizes are found to be as small as 1 to 2 nm in diameter. Specimen preparation details and imaging issues for very small bubbles are discussed.


    3, He injection, palladium, bubbles

    Author Information:

    Gelles, DS
    Staff Engineer, Richland, WA

    Causey, RA
    Staff, Sandia National Laboratories, Livermore, CA

    Hertz, K
    Staff, Sandia National Laboratories, Livermore, CA

    Cowgill, DF
    Staff, Sandia National Laboratories, Livermore, CA

    Schäublin, R
    Staff, EPFL-CRPP Fusion Technology,

    Committee/Subcommittee: E10.02

    DOI: 10.1520/STP11251S

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