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)

Grant/Contract Number:: NA0001942

OSTI ID:: 1253990

Report Number(s):: MS/GAR--160503

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

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
U-Mo alloys
eutectoid decomposition
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Title: α-Phase transformation kinetics of U – 8 wt% Mo established by in situ neutron diffraction

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