Equation of state, phase stability, and phase transformations of uranium-6 wt.% niobium under high pressure and temperature

Zhang, Jianzhong; Vogel, Sven C.; Brown, Donald William; Clausen, Bjorn; Hackenberg, Robert Errol

doi:10.1063/1.5032308

Title: Equation of state, phase stability, and phase transformations of uranium-6 wt.% niobium under high pressure and temperature

Journal Article · Fri May 04 00:00:00 EDT 2018 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.5032308· OSTI ID:1482941

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Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

In-situ time-of-flight neutron diffraction experiments were conducted on the uranium-niobium alloy with 6 wt. % Nb (U–6Nb) at pressures up to 4.7 GPa and temperatures up to 1073 K. Upon static compression at room temperature, the monoclinic structure of U–6Nb (α" U–6Nb) remains stable up to the highest experimental pressure. Based on the pressure-volume measurements at room temperature, the least-squares fit using the finite-strain equation of state (EOS) yields an isothermal bulk modulus of B₀ = 127±2 GPa for the α"-phase of U–6Nb. The calculated zero-pressure bulk sound speed from this EOS is 2.706±0.022 km/s, which is in good agreement with the linear extrapolation of the previous Hugoniot data above 12 GPa for α" U–6Nb, indicating that the dynamic response under those shock-loading conditions is consistent with the stabilization of the initial monoclinic phase of U-6Nb. Upon heating at ambient and high pressures, the metastable α" U–6Nb exhibits complex transformation paths leading to the diffusional phase decomposition, which are sensitive to applied pressure, stress state, and temperature-time path. These findings provide new insight into the behavior of atypical systems such as U-Nb and suggest that the different U-Nb phases are separated by rather small energies and hence highly sensitive to compositional, thermal, and mechanical perturbations.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1482941

Report Number(s):: LA-UR-18-22186

Journal Information:: Journal of Applied Physics, Vol. 123, Issue 17; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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Equation of state and phase evolution of U-7.7Nb with implications for the understanding of dynamic behavior of U-Nb alloys Zhang, Jianzhong; Hackenberg, Robert E.; Vogel, Sven C. Applied Physics Letters, Vol. 114, Issue 22 https://doi.org/10.1063/1.5095755	journal	June 2019

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