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

JOURNAL OF NUCLEAR MATERIALS

卷:498

Article

Jeffries, J. R.¹  Hammons, J. A.¹  Willey, T. M.¹  Wall, M. A.¹  Ruddle, D.¹  Ilavsky, J.²  Allen, P. G.¹  van Buuren, T.¹ 

[1] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[2] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

关键词: Plutonium;    He bubbles;    Self-irradiation;    Small-angle x-ray scattering;   

DOI  :  10.1016/j.jnucmat.2017.10.058

来源: Elsevier

【 摘 要 】

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 delta-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 delta-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 degrees C for 24 h, and analysis of the He bubble content suggests that He is actually lost from the bubbles with annealing. (c) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

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