Abstract
Alpha-radiation damage in metals is a concern for long-term radioactive storage and systems that produce nuclear energy. Accurate prediction of irradiated material properties and failure mechanisms depends on a fundamental understanding of the size and relative percentage of helium (He) bubbles. X-ray scattering experiments are a valuable tool to resolve the nanobubble morphology (of ~ 1011 bubbles) and crystallographic strain as a function of He implantation energy and concentration in aluminum (Al) foils. A proportional change in bubble volume fraction is observed with He concentration within the same sample, while only a slight increase in the mean bubble size is observed. Estimates of the He fraction in the bubble phase with sizes ~ 4 nm, along with the overall crystallographic strain, suggest a proportion of the total implanted He exists as small bubbles (~ 1 nm) and possibly as defects in the crystal lattice. However, the fraction of He in 4-nm nanobubbles increases significantly when the He energy is above the Coulomb barrier of Al.
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Acknowledgements
This work was performed under the auspices of the US Department of Energy by Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344. This research also used resources of the Advanced Photon Source (APS Sector 9-ID-C), a US Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
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Hammons, J.A., Tumey, S.J., Idell, Y. et al. He Bubble Concentration, Size and Strain in Implanted Aluminum by SAXS/WAXS. JOM 72, 176–186 (2020). https://doi.org/10.1007/s11837-019-03763-7
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DOI: https://doi.org/10.1007/s11837-019-03763-7