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Title: In-situ neutron diffraction characterization of temperature dependence deformation in α-uranium

Abstract

In-situ strain neutron diffraction measurements were conducted at temperature on specimens coming from a clock-rolled α-uranium plate, and Elasto-Plastic Self-Consistent (EPSC) modeling was employed to interpret the findings. The modeling revealed that the active slip systems exhibit a thermally activated response, while deformation twinning remains athermal over the temperature ranges explored (25-150 °C). The modeling also allowed assessment of the effects of thermal residual stresses on the mechanical response during compression. These results are consistent with those from a prior study of room-temperature deformation, indicating that the thermal residual stresses strongly influence the internal strain evolution of grain families, as monitored with neutron diffraction, even though accounting for these residual stresses has little effect on the macroscopic flow curve, except in the elasto-plastic transition.

Authors:
 [1];  [2];  [3];  [1]
  1. Univ. of Virginia, Charlottesville, VA (United States)
  2. Y-12 National Security Complex, Oak Ridge, TN (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Oak Ridge Y-12 Plant (Y-12), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1478070
Report Number(s):
IROS302
Journal ID: ISSN 0022-3115
Grant/Contract Number:  
DE-NA0001942
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 502; Journal Issue: C; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; uranium; neutron diffraction; residual strain; internal strain; EPSC; Elasto-Plastic Self-Consistent modeling; twinning; deformation modes

Citation Formats

Calhoun, C. A., Garlea, E., Sisneros, T. A., and Agnew, S. R.. In-situ neutron diffraction characterization of temperature dependence deformation in α-uranium. United States: N. p., 2018. Web. doi:10.1016/j.jnucmat.2018.01.036.
Calhoun, C. A., Garlea, E., Sisneros, T. A., & Agnew, S. R.. In-situ neutron diffraction characterization of temperature dependence deformation in α-uranium. United States. doi:10.1016/j.jnucmat.2018.01.036.
Calhoun, C. A., Garlea, E., Sisneros, T. A., and Agnew, S. R.. Sat . "In-situ neutron diffraction characterization of temperature dependence deformation in α-uranium". United States. doi:10.1016/j.jnucmat.2018.01.036. https://www.osti.gov/servlets/purl/1478070.
@article{osti_1478070,
title = {In-situ neutron diffraction characterization of temperature dependence deformation in α-uranium},
author = {Calhoun, C. A. and Garlea, E. and Sisneros, T. A. and Agnew, S. R.},
abstractNote = {In-situ strain neutron diffraction measurements were conducted at temperature on specimens coming from a clock-rolled α-uranium plate, and Elasto-Plastic Self-Consistent (EPSC) modeling was employed to interpret the findings. The modeling revealed that the active slip systems exhibit a thermally activated response, while deformation twinning remains athermal over the temperature ranges explored (25-150 °C). The modeling also allowed assessment of the effects of thermal residual stresses on the mechanical response during compression. These results are consistent with those from a prior study of room-temperature deformation, indicating that the thermal residual stresses strongly influence the internal strain evolution of grain families, as monitored with neutron diffraction, even though accounting for these residual stresses has little effect on the macroscopic flow curve, except in the elasto-plastic transition.},
doi = {10.1016/j.jnucmat.2018.01.036},
journal = {Journal of Nuclear Materials},
issn = {0022-3115},
number = C,
volume = 502,
place = {United States},
year = {2018},
month = {2}
}

Journal Article:
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