Elastic moduli of δ-Pu 239 reveal aging in real time

Maiorov, Boris; Betts, Jonathan B.; Söderlind, Per; Landa, Alexander; Hernandez, Sarah C.; Saleh, Tarik A.; Freibert, Franz J.; Migliori, Albert

doi:10.1063/1.4978509

Elastic moduli of δ-Pu ²³⁹ reveal aging in real time

Journal Article · Tue Mar 28 00:00:00 EDT 2017 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4978509· OSTI ID:1349003

^[1]; Betts, Jonathan B. ^[1]; Söderlind, Per ^[2]; Landa, Alexander ^[2]; Hernandez, Sarah C. ^[1]; Saleh, Tarik A. ^[1]; Freibert, Franz J. ^[1]; Migliori, Albert ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

We study the time evolution (aging) of the elastic moduli of an eight-year-old polycrystalline δ- Pu 2.0 at % Ga alloy (δ-Pu:Ga ) from 295K to nearly 500K in real time using Resonant Ultrasound Spectroscopy (RUS). After 8 years of aging at 295K, the bulk and shear moduli increase at a normalized rate of 0.2%/year and 0.6%/year respectively. As the temperature is raised, two time dependences are observed, an exponential one of about a week, followed by a linear one (constant rate). The linear rate is thermally activated with an activation energy of 0.33+0.06 eV. Above 420K a qualitative change in the time evolution is observed; the bulk modulus decreases with time while the shear modulus continues to stiffen. No change is observed as the α-β transition temperature is crossed as would be expected if a decomposition of δ-Pu:Ga to α-Pu and Pu₃Ga occurred over the temperature range studied. Our results indicate that the main mechanism of aging is creation of defects that are partially annealed starting at T = 420 K.

View Accepted Manuscript (DOE)

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Materials Science of Actinides (MSA); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1349003

Alternate ID(s):: OSTI ID: 1349383
OSTI ID: 1352421

Report Number(s):: LLNL--JRNL-712781

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 12 Vol. 121; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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