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Title: Equation of state and strain-induced stabilization of δ-phase stabilized plutonium alloys

Abstract

An in-situ high-pressure neutron diffraction experiment was conducted on a δ-phase stabilized plutonium alloy with isotope 242Pu. Upon room-temperature compression, neither of the previously reported pressure-induced transformation paths, δ → α' or δ → γ’ → α', was observed up to 1.2 GPa. Instead, a drastic reduction in the diffraction intensity of the δ phase was observed when the pressure was above 0.8 GPa. At the highest pressure of the experiment (1.2 GPa), the diffraction data appear to be characteristic of an amorphous state, manifested by the diminishing intensities of all diffraction lines. Additionally, no evidence was found to support the transformation to a body-centered tetragonal structure (δ’), which was previously inferred from the diffraction line broadening during initial compression to 0.1 GPa. The discrepancies between the present and previous experiments suggest a substantial strain-induced stabilization of the δ-phase and is presumably attributed to the different stress states in the high-pressure environments. From the pressure - volume measurements, the determined isothermal bulk modulus for the δ-phase is in the range of 31.9 ± 1.3–34.8 ± 1.8 GPa using different pressure scales, comparable to those obtained from the resonant ultrasound spectroscopy measurements of the alloys of similar composition. Finally, the pressure-inducedmore » elastic softening is neither convinced in the present work, nor can it be resolved from the diffraction experiments if it is intrinsically weak.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1544695
Report Number(s):
LA-UR-19-22447
Journal ID: ISSN 0022-3115
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 524; Journal Issue: C; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; plutonium-gallium alloy; neutron diffraction; high pressure; equation of state; phase stability

Citation Formats

Zhang, Jianzhong, Freibert, Franz Joseph, Clausen, Bjorn, Smith, Alice Iulia, Vogel, Sven C., and Brown, Donald William. Equation of state and strain-induced stabilization of δ-phase stabilized plutonium alloys. United States: N. p., 2019. Web. doi:10.1016/j.jnucmat.2019.06.036.
Zhang, Jianzhong, Freibert, Franz Joseph, Clausen, Bjorn, Smith, Alice Iulia, Vogel, Sven C., & Brown, Donald William. Equation of state and strain-induced stabilization of δ-phase stabilized plutonium alloys. United States. doi:10.1016/j.jnucmat.2019.06.036.
Zhang, Jianzhong, Freibert, Franz Joseph, Clausen, Bjorn, Smith, Alice Iulia, Vogel, Sven C., and Brown, Donald William. Wed . "Equation of state and strain-induced stabilization of δ-phase stabilized plutonium alloys". United States. doi:10.1016/j.jnucmat.2019.06.036.
@article{osti_1544695,
title = {Equation of state and strain-induced stabilization of δ-phase stabilized plutonium alloys},
author = {Zhang, Jianzhong and Freibert, Franz Joseph and Clausen, Bjorn and Smith, Alice Iulia and Vogel, Sven C. and Brown, Donald William},
abstractNote = {An in-situ high-pressure neutron diffraction experiment was conducted on a δ-phase stabilized plutonium alloy with isotope 242Pu. Upon room-temperature compression, neither of the previously reported pressure-induced transformation paths, δ → α' or δ → γ’ → α', was observed up to 1.2 GPa. Instead, a drastic reduction in the diffraction intensity of the δ phase was observed when the pressure was above 0.8 GPa. At the highest pressure of the experiment (1.2 GPa), the diffraction data appear to be characteristic of an amorphous state, manifested by the diminishing intensities of all diffraction lines. Additionally, no evidence was found to support the transformation to a body-centered tetragonal structure (δ’), which was previously inferred from the diffraction line broadening during initial compression to 0.1 GPa. The discrepancies between the present and previous experiments suggest a substantial strain-induced stabilization of the δ-phase and is presumably attributed to the different stress states in the high-pressure environments. From the pressure - volume measurements, the determined isothermal bulk modulus for the δ-phase is in the range of 31.9 ± 1.3–34.8 ± 1.8 GPa using different pressure scales, comparable to those obtained from the resonant ultrasound spectroscopy measurements of the alloys of similar composition. Finally, the pressure-induced elastic softening is neither convinced in the present work, nor can it be resolved from the diffraction experiments if it is intrinsically weak.},
doi = {10.1016/j.jnucmat.2019.06.036},
journal = {Journal of Nuclear Materials},
number = C,
volume = 524,
place = {United States},
year = {2019},
month = {6}
}

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This content will become publicly available on June 26, 2020
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