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Title: Temperature dependent elastic properties of γ-phase U – 8 wt% Mo

Abstract

Polycrystalline elastic moduli and stiffness tensor components of γ-phase U – 8 wt% Mo have been determined by resonant ultrasound spectroscopy in the temperature range of 25-650°C. The ambient temperature elastic properties are compared to results measured via other experimental methods and show reasonable agreement, though there is considerable variation of these properties within the literature at both the U – 8 wt% Mo composition and as a function of Mo concentration. The Young’s modulus of U – 8 wt% Mo measured in this study decreases steadily with temperature at a rate that is slower than trends previously observed at similar Mo concentrations, though the difference is not statistically significant. This first measurement of the temperature dependent elastic stiffness tensor of a polycrystalline U-Mo alloy clarifies that the behavior of the Young’s modulus is due to a strongly weakening C11 polycrystalline stiffness tensor component, along with milder decreases in C12 and C44. The unique partially auxetic properties recently predicted for singlecrystalline U-Mo are discussed in regard to their possible impact on the polycrystalline behavior of the alloy.

Authors:
 [1];  [2];  [2];  [2];  [3]
  1. Univ. of Cincinnati, OH (United States)
  2. Y-12 National Security Complex, Oak Ridge, TN (United States)
  3. Univ. of Virginia, Charlottesville, VA (United States)
Publication Date:
Research Org.:
Oak Ridge Y-12 Plant (Y-12), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1427687
Alternate Identifier(s):
OSTI ID: 1548866
Report Number(s):
IROS-780
Journal ID: ISSN 0022-3115; TRN: US1802731
Grant/Contract Number:  
NA0001942; DE NA 0001942
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 500; Journal Issue: C; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; U-Mo; Elastic Constants; Elastic Moduli; Resonant Ultrasound Spectroscopy

Citation Formats

Steiner, M. A., Garlea, E., Creasy, J., DeMint, A., and Agnew, S. R. Temperature dependent elastic properties of γ-phase U – 8 wt% Mo. United States: N. p., 2017. Web. doi:10.1016/j.jnucmat.2017.12.033.
Steiner, M. A., Garlea, E., Creasy, J., DeMint, A., & Agnew, S. R. Temperature dependent elastic properties of γ-phase U – 8 wt% Mo. United States. doi:10.1016/j.jnucmat.2017.12.033.
Steiner, M. A., Garlea, E., Creasy, J., DeMint, A., and Agnew, S. R. Thu . "Temperature dependent elastic properties of γ-phase U – 8 wt% Mo". United States. doi:10.1016/j.jnucmat.2017.12.033. https://www.osti.gov/servlets/purl/1427687.
@article{osti_1427687,
title = {Temperature dependent elastic properties of γ-phase U – 8 wt% Mo},
author = {Steiner, M. A. and Garlea, E. and Creasy, J. and DeMint, A. and Agnew, S. R.},
abstractNote = {Polycrystalline elastic moduli and stiffness tensor components of γ-phase U – 8 wt% Mo have been determined by resonant ultrasound spectroscopy in the temperature range of 25-650°C. The ambient temperature elastic properties are compared to results measured via other experimental methods and show reasonable agreement, though there is considerable variation of these properties within the literature at both the U – 8 wt% Mo composition and as a function of Mo concentration. The Young’s modulus of U – 8 wt% Mo measured in this study decreases steadily with temperature at a rate that is slower than trends previously observed at similar Mo concentrations, though the difference is not statistically significant. This first measurement of the temperature dependent elastic stiffness tensor of a polycrystalline U-Mo alloy clarifies that the behavior of the Young’s modulus is due to a strongly weakening C11 polycrystalline stiffness tensor component, along with milder decreases in C12 and C44. The unique partially auxetic properties recently predicted for singlecrystalline U-Mo are discussed in regard to their possible impact on the polycrystalline behavior of the alloy.},
doi = {10.1016/j.jnucmat.2017.12.033},
journal = {Journal of Nuclear Materials},
number = C,
volume = 500,
place = {United States},
year = {2017},
month = {12}
}

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