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Title: Probing He bubbles in naturally aged and annealed δ-Pu alloys using ultra-small-angle x-ray scattering

Abstract

We report the self-irradiation of Pu alloys generates He that is trapped within the metal matrix in the form of He bubbles. The distribution of these He bubbles in δ-phase Pu-Ga alloys exhibits a peak near a radius of 0.7 nm, and this size is remarkably stable as function of time. When annealed, the He bubbles in δ-Pu alloys grow, coarsening the distribution. However, the magnitude of this coarsening is uncertain, as different experimental methods reveal bubbles that differ by at least one order of magnitude. Small-angle x-ray scattering results, which can probe a wide range of bubble sizes, imply only a mild coarsening of the He bubble distribution for an annealing treatment of 425 °C for 24 h, and analysis of the He bubble content suggests that He is actually lost from the bubbles with annealing.

Authors:
 [1];  [1]; ORCiD logo [1];  [1];  [1]; ORCiD logo [2];  [1];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1420075
Alternate Identifier(s):
OSTI ID: 1438723; OSTI ID: 1549453
Report Number(s):
[LLNL-JRNL-736296]
[Journal ID: ISSN 0022-3115; 137553; TRN: US1801452]
Grant/Contract Number:  
[AC02-06CH11357; AC52-07NA27344]
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
[ Journal Volume: 498; Journal Issue: C]; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; He bubbles; Plutonium; self-irradiation; small-angle x-ray scattering; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Jeffries, J. R., Hammons, J. A., Willey, T. M., Wall, M. A., Ruddle, D., Ilavsky, J., Allen, P. G., and van Buuren, T. Probing He bubbles in naturally aged and annealed δ-Pu alloys using ultra-small-angle x-ray scattering. United States: N. p., 2017. Web. doi:10.1016/j.jnucmat.2017.10.058.
Jeffries, J. R., Hammons, J. A., Willey, T. M., Wall, M. A., Ruddle, D., Ilavsky, J., Allen, P. G., & van Buuren, T. Probing He bubbles in naturally aged and annealed δ-Pu alloys using ultra-small-angle x-ray scattering. United States. doi:10.1016/j.jnucmat.2017.10.058.
Jeffries, J. R., Hammons, J. A., Willey, T. M., Wall, M. A., Ruddle, D., Ilavsky, J., Allen, P. G., and van Buuren, T. Tue . "Probing He bubbles in naturally aged and annealed δ-Pu alloys using ultra-small-angle x-ray scattering". United States. doi:10.1016/j.jnucmat.2017.10.058. https://www.osti.gov/servlets/purl/1420075.
@article{osti_1420075,
title = {Probing He bubbles in naturally aged and annealed δ-Pu alloys using ultra-small-angle x-ray scattering},
author = {Jeffries, J. R. and Hammons, J. A. and Willey, T. M. and Wall, M. A. and Ruddle, D. and Ilavsky, J. and Allen, P. G. and van Buuren, T.},
abstractNote = {We report the self-irradiation of Pu alloys generates He that is trapped within the metal matrix in the form of He bubbles. The distribution of these He bubbles in δ-phase Pu-Ga alloys exhibits a peak near a radius of 0.7 nm, and this size is remarkably stable as function of time. When annealed, the He bubbles in δ-Pu alloys grow, coarsening the distribution. However, the magnitude of this coarsening is uncertain, as different experimental methods reveal bubbles that differ by at least one order of magnitude. Small-angle x-ray scattering results, which can probe a wide range of bubble sizes, imply only a mild coarsening of the He bubble distribution for an annealing treatment of 425 °C for 24 h, and analysis of the He bubble content suggests that He is actually lost from the bubbles with annealing.},
doi = {10.1016/j.jnucmat.2017.10.058},
journal = {Journal of Nuclear Materials},
number = [C],
volume = [498],
place = {United States},
year = {2017},
month = {10}
}

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Figure 1 Figure 1: A 3D-rendered CAD schematic of the assembled triple-encapsulated sample holder labeling the body, flanges, and sample well. Additionally, the red, blue, and green lines approximately indicate the positions of the Mylar/Kapton films used as the primary, secondary, and tertiary containment barriers. The assembled holder is 0.5” in diametermore » and about 0.5” tall (including o-rings).« less

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