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Title: Equation of state and phase evolution of U-7.7Nb with implications for the understanding of dynamic behavior of U-Nb alloys

Abstract

Here, we performed in-situ high P-T neutron diffraction experiments on U-7.7Nb. Our results show that the tetragonal γo phase is substantially more compressible than the monoclinic α" phase. As the pressure increases, this leads to increased volume collapse and stress relaxation for the reverse martensitic transformation, α" → γ°. At moderately elevated temperatures, a substantial strain-induced stabilization against transformation into a body centered cubic γ phase was observed in the γ° phase. Additionally, it was discovered that the ability to retain the metastable γ phase, formed from rapid heating of thermally reset γ°, has subtle dependence on the austenitization temperature. The present findings provide a direct test for the hypotheses proposed to explain the low-pressure shock behaviors of the U-Nb alloys.

Authors:
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:
1544740
Report Number(s):
LA-UR-19-22127
Journal ID: ISSN 0003-6951
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 114; Journal Issue: 22; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; U-Nb alloys; EOS; phase transformation; high pressure; neutron diffraction

Citation Formats

Zhang, Jianzhong, Hackenberg, Robert E., Vogel, Sven C., and Brown, Donald W. Equation of state and phase evolution of U-7.7Nb with implications for the understanding of dynamic behavior of U-Nb alloys. United States: N. p., 2019. Web. doi:10.1063/1.5095755.
Zhang, Jianzhong, Hackenberg, Robert E., Vogel, Sven C., & Brown, Donald W. Equation of state and phase evolution of U-7.7Nb with implications for the understanding of dynamic behavior of U-Nb alloys. United States. doi:10.1063/1.5095755.
Zhang, Jianzhong, Hackenberg, Robert E., Vogel, Sven C., and Brown, Donald W. Mon . "Equation of state and phase evolution of U-7.7Nb with implications for the understanding of dynamic behavior of U-Nb alloys". United States. doi:10.1063/1.5095755.
@article{osti_1544740,
title = {Equation of state and phase evolution of U-7.7Nb with implications for the understanding of dynamic behavior of U-Nb alloys},
author = {Zhang, Jianzhong and Hackenberg, Robert E. and Vogel, Sven C. and Brown, Donald W.},
abstractNote = {Here, we performed in-situ high P-T neutron diffraction experiments on U-7.7Nb. Our results show that the tetragonal γo phase is substantially more compressible than the monoclinic α" phase. As the pressure increases, this leads to increased volume collapse and stress relaxation for the reverse martensitic transformation, α" → γ°. At moderately elevated temperatures, a substantial strain-induced stabilization against transformation into a body centered cubic γ phase was observed in the γ° phase. Additionally, it was discovered that the ability to retain the metastable γ phase, formed from rapid heating of thermally reset γ°, has subtle dependence on the austenitization temperature. The present findings provide a direct test for the hypotheses proposed to explain the low-pressure shock behaviors of the U-Nb alloys.},
doi = {10.1063/1.5095755},
journal = {Applied Physics Letters},
number = 22,
volume = 114,
place = {United States},
year = {2019},
month = {6}
}

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Works referenced in this record:

Finite strain isotherm and velocities for single-crystal and polycrystalline NaCl at high pressures and 300°K
journal, January 1978