SYMPOSIA PAPER Published: 01 January 2004

Bubble Microstructures in Helium Injected Palladium Foils


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.

Author Information

Gelles, DS
, Richland, WA, USA
Causey, RA
Sandia National Laboratories, Livermore, CA
Hertz, K
Sandia National Laboratories, Livermore, CA
Cowgill, DF
Sandia National Laboratories, Livermore, CA
Schäublin, R
EPFL-CRPP Fusion Technology, Switzerland
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Developed by Committee: E10
Pages: 492–501
DOI: 10.1520/STP11251S
ISBN-EB: 978-0-8031-5494-0
ISBN-13: 978-0-8031-3477-5