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Title: Line profile analysis of dislocation densities of the δ-phase 239Pu-2.0 at%Ga alloy using neutron diffraction

Abstract

Time-of-flight neutron diffraction measurements were conducted at ambient conditions to study microstructures of the δ-phase 239Pu-2at% Ga alloy. Based on the line profile analysis of diffraction data we derived dislocation densities using a correction routine to account for the anisotropic strain broadening. Our results show here that the average dislocation density in the as-received sample, previously treated at cryogenic temperatures, is five times higher than the dislocation density measured after annealing the sample, indicating that the neutron instrumentation used in this work has sufficient resolution to detect the dislocation density changes in different sample processing. These results are also in reasonably good agreement with the dislocation densities previously reported based on TEM observations and x-ray diffraction data, suggesting that the simple correction routines applied in this work have a fairly good fidelity for deriving important microstructural information such as dislocation density for elastically highly anisotropic δ-phase 239Pu-Ga alloys.

Authors:
 [1];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [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:
1511234
Report Number(s):
LA-UR-18-24227
Journal ID: ISSN 0022-3115
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 517; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; plutonium-gallium alloy; neutron diffraction; line profile analysis; dislocation density

Citation Formats

Zhang, Jianzhong, Clausen, Bjorn, Smith, Alice I., Freibert, Franz J., Vogel, Sven C., and Brown, Donald W. Line profile analysis of dislocation densities of the δ-phase 239Pu-2.0 at%Ga alloy using neutron diffraction. United States: N. p., 2019. Web. doi:10.1016/j.jnucmat.2019.02.011.
Zhang, Jianzhong, Clausen, Bjorn, Smith, Alice I., Freibert, Franz J., Vogel, Sven C., & Brown, Donald W. Line profile analysis of dislocation densities of the δ-phase 239Pu-2.0 at%Ga alloy using neutron diffraction. United States. doi:10.1016/j.jnucmat.2019.02.011.
Zhang, Jianzhong, Clausen, Bjorn, Smith, Alice I., Freibert, Franz J., Vogel, Sven C., and Brown, Donald W. Wed . "Line profile analysis of dislocation densities of the δ-phase 239Pu-2.0 at%Ga alloy using neutron diffraction". United States. doi:10.1016/j.jnucmat.2019.02.011.
@article{osti_1511234,
title = {Line profile analysis of dislocation densities of the δ-phase 239Pu-2.0 at%Ga alloy using neutron diffraction},
author = {Zhang, Jianzhong and Clausen, Bjorn and Smith, Alice I. and Freibert, Franz J. and Vogel, Sven C. and Brown, Donald W.},
abstractNote = {Time-of-flight neutron diffraction measurements were conducted at ambient conditions to study microstructures of the δ-phase 239Pu-2at% Ga alloy. Based on the line profile analysis of diffraction data we derived dislocation densities using a correction routine to account for the anisotropic strain broadening. Our results show here that the average dislocation density in the as-received sample, previously treated at cryogenic temperatures, is five times higher than the dislocation density measured after annealing the sample, indicating that the neutron instrumentation used in this work has sufficient resolution to detect the dislocation density changes in different sample processing. These results are also in reasonably good agreement with the dislocation densities previously reported based on TEM observations and x-ray diffraction data, suggesting that the simple correction routines applied in this work have a fairly good fidelity for deriving important microstructural information such as dislocation density for elastically highly anisotropic δ-phase 239Pu-Ga alloys.},
doi = {10.1016/j.jnucmat.2019.02.011},
journal = {Journal of Nuclear Materials},
number = ,
volume = 517,
place = {United States},
year = {2019},
month = {2}
}

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This content will become publicly available on February 13, 2020
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