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.
- 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. https://doi.org/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. https://doi.org/10.1063/1.5095755. https://www.osti.gov/servlets/purl/1544740.
@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 = {Mon Jun 03 00:00:00 EDT 2019},
month = {Mon Jun 03 00:00:00 EDT 2019}
}
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