Elastic moduli of $$\delta$$-Pu239 reveal aging in real time
Abstract
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.
- Authors:
-
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Energy Frontier Research Centers (EFRC) (United States). Materials Science of Actinides (MSA); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1352421
- Alternate Identifier(s):
- OSTI ID: 1349003; OSTI ID: 1349383
- Report Number(s):
- LA-UR-16-28430; LLNL-JRNL-712781
Journal ID: ISSN 0021-8979; TRN: US1700582
- Grant/Contract Number:
- AC52-06NA25396; SC0001089; AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Applied Physics
- Additional Journal Information:
- Journal Volume: 121; Journal Issue: 12; Journal ID: ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Plutonium aging elastic constants; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Maiorov, Boris Alfredo, Betts, Jonathan Bobby, Soderlind, Per, Landa, Alexander, Hernandez, Sarah Christine, Saleh, Tarik A., Freibert, Franz Joseph, and Migliori, Albert. Elastic moduli of $\delta$-Pu239 reveal aging in real time. United States: N. p., 2017.
Web. doi:10.1063/1.4978509.
Maiorov, Boris Alfredo, Betts, Jonathan Bobby, Soderlind, Per, Landa, Alexander, Hernandez, Sarah Christine, Saleh, Tarik A., Freibert, Franz Joseph, & Migliori, Albert. Elastic moduli of $\delta$-Pu239 reveal aging in real time. United States. https://doi.org/10.1063/1.4978509
Maiorov, Boris Alfredo, Betts, Jonathan Bobby, Soderlind, Per, Landa, Alexander, Hernandez, Sarah Christine, Saleh, Tarik A., Freibert, Franz Joseph, and Migliori, Albert. Fri .
"Elastic moduli of $\delta$-Pu239 reveal aging in real time". United States. https://doi.org/10.1063/1.4978509. https://www.osti.gov/servlets/purl/1352421.
@article{osti_1352421,
title = {Elastic moduli of $\delta$-Pu239 reveal aging in real time},
author = {Maiorov, Boris Alfredo and Betts, Jonathan Bobby and Soderlind, Per and Landa, Alexander and Hernandez, Sarah Christine and Saleh, Tarik A. and Freibert, Franz Joseph and Migliori, Albert},
abstractNote = {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.},
doi = {10.1063/1.4978509},
journal = {Journal of Applied Physics},
number = 12,
volume = 121,
place = {United States},
year = {Fri Mar 24 00:00:00 EDT 2017},
month = {Fri Mar 24 00:00:00 EDT 2017}
}
Web of Science
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