α-Phase transformation kinetics of U – 8 wt% Mo established by in situ neutron diffraction

Garlea, Elena; Steiner, M. A.; Calhoun, C. A.; Klein, R. W.; An, K.; Agnew, S. R.

doi:10.1016/j.jnucmat.2016.05.016

Title: α-Phase transformation kinetics of U – 8 wt% Mo established by in situ neutron diffraction

Journal Article · Sun May 08 00:00:00 EDT 2016 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2016.05.016· OSTI ID:1253990

Garlea, Elena ^[1]; Steiner, M. A. ^[2]; Calhoun, C. A. ^[2]; Klein, R. W. ^[2]; An, K. ^[3]; Agnew, S. R. ^[2]

Y-12 National Security Complex, Oak Ridge, TN (United States)
Univ. of Virginia, Charlottesville, VA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The α-phase transformation kinetics of as-cast U - 8 wt% Mo below the eutectoid temperature have been established by in situ neutron diffraction. α-phase weight fraction data acquired through Rietveld refinement at five different isothermal hold temperatures can be modeled accurately utilizing a simple Johnson-Mehl-Avrami-Kolmogorov impingement-based theory, and the results are validated by a corresponding evolution in the γ-phase lattice parameter during transformation that follows Vegard’s law. Neutron diffraction data is used to produce a detailed Time-Temperature-Transformation diagram that improves upon inconsistencies in the current literature, exhibiting a minimum transformation start time of 40 min at temperatures between 500 °C and 510 °C. Lastly, the transformation kinetics of U – 8 wt% Mo can vary significantly from as-cast conditions after extensive heat treatments, due to homogenization of the typical dendritic microstructure which possesses non-negligible solute segregation.

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Research Organization:: Oak Ridge Y-12 Plant (Y-12), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Defense Programs (DP); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: NA0001942; DE NA0001942

OSTI ID:: 1253990

Alternate ID(s):: OSTI ID: 1323968

Report Number(s):: MS/GAR-160503; TRN: US1601723

Journal Information:: Journal of Nuclear Materials, Vol. 477, Issue C; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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Cited By (4)

Discontinuous Precipitation in U-10 wt.%Mo Alloy: Reaction Kinetics, Effect of Prior γ-UMo Microstructure, the Role of Grain-Boundary Misorientation, and the Effect of Ternary Alloying Addition Jana, Saumyadeep; Overman, Nicole; Devaraj, Arun JOM, Vol. 71, Issue 8 https://doi.org/10.1007/s11837-019-03588-4	journal	June 2019
RHEGAL: Resistive heating gas enclosure loadframe for in situ neutron scattering An, Ke; Armitage, Douglas P.; Yu, Zhenzhen Review of Scientific Instruments, Vol. 89, Issue 9 https://doi.org/10.1063/1.5033566	journal	September 2018
Texture Evolution in U-10Mo Nuclear Fuel Foils during Plasma Spray Coating with Zr Takajo, Shigehiro; Hollis, Kendall; Cummins, Dustin Quantum Beam Science, Vol. 2, Issue 2 https://doi.org/10.3390/qubs2020012	journal	May 2018
Event-based processing of neutron scattering data at the Spallation Neutron Source Granroth, Garrett E.; An, Ke; Smith, Hillary L. Journal of Applied Crystallography, Vol. 51, Issue 3 https://doi.org/10.1107/s1600576718004727	journal	May 2018

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36 MATERIALS SCIENCE
U-Mo alloys
neutron diffraction
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eutectoid decomposition

Title: α-Phase transformation kinetics of U – 8 wt% Mo established by in situ neutron diffraction

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