Phase transformation of metastable discontinuous precipitation products to equilibrium phases in U10Mo alloys

doi:10.1016/j.scriptamat.2018.07.010

Title: Phase transformation of metastable discontinuous precipitation products to equilibrium phases in U10Mo alloys

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Authors:: Devaraj, Arun; Kautz, Elizabeth; Kovarik, Libor; Jana, Saumyadeep; Overman, Nicole; Lavender, Curt; Joshi, Vineet V.

Publication Date:: 2018-11-01

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Biological and Environmental Research (BER)

OSTI Identifier:: 1548089

Grant/Contract Number:: AC05-76RL01830

Resource Type:: Publisher's Accepted Manuscript

Journal Name:: Scripta Materialia

Additional Journal Information:: Journal Name: Scripta Materialia Journal Volume: 156 Journal Issue: C; Journal ID: ISSN 1359-6462

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

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                    Devaraj, Arun, Kautz, Elizabeth, Kovarik, Libor, Jana, Saumyadeep, Overman, Nicole, Lavender, Curt, and Joshi, Vineet V. Phase transformation of metastable discontinuous precipitation products to equilibrium phases in U10Mo alloys.  United States: N. p., 2018. 
        Web.  doi:10.1016/j.scriptamat.2018.07.010.

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                    Devaraj, Arun, Kautz, Elizabeth, Kovarik, Libor, Jana, Saumyadeep, Overman, Nicole, Lavender, Curt, & Joshi, Vineet V. Phase transformation of metastable discontinuous precipitation products to equilibrium phases in U10Mo alloys.  United States.  doi:10.1016/j.scriptamat.2018.07.010.

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                    Devaraj, Arun, Kautz, Elizabeth, Kovarik, Libor, Jana, Saumyadeep, Overman, Nicole, Lavender, Curt, and Joshi, Vineet V. Thu .  
        "Phase transformation of metastable discontinuous precipitation products to equilibrium phases in U10Mo alloys".  United States.  doi:10.1016/j.scriptamat.2018.07.010.

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@article{osti_1548089,

  title        = {Phase transformation of metastable discontinuous precipitation products to equilibrium phases in U10Mo alloys},

  author       = {Devaraj, Arun and Kautz, Elizabeth and Kovarik, Libor and Jana, Saumyadeep and Overman, Nicole and Lavender, Curt and Joshi, Vineet V.},

  abstractNote = {},

  doi          = {10.1016/j.scriptamat.2018.07.010},

  journal      = {Scripta Materialia},

  number       = C,

  volume       = 156,

  place        = {United States},

  year         = {2018},

  month        = {11}

}

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DOI: 10.1016/j.scriptamat.2018.07.010

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Phase transformation of metastable discontinuous precipitation products to equilibrium phases in U10Mo alloys

Journal Article Devaraj, Arun ; Kautz, Elizabeth J. ; Kovarik, Libor ; ... - Scripta Materialia

In this study, the discontinuous precipitation (DP) mechanism is prevalent in over 80 alloy systems. We report a new type of DP occurring along prior -UMo grain boundaries of an alloy of uranium with 10 wt% molybdenum (U10Mo) during annealing at 500°C, forming alternate lamellae of Mo-enriched -UMo and -U. During prolonged annealing, the metastable Mo-enriched -UMo lamellae gradually transform into a composite mixture of equilibrium -U₂Mo embedded in Mo-depleted -UMo. Using high resolution scanning transmission electron microscopy and atom probe tomography, a comprehensive description of the structural and compositional changes of the metastable lamellar DP product to near-equilibrium phasesmore » is provided.« less
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Grain boundary engineering to control the discontinuous precipitation in multicomponent U10Mo alloy

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Grain boundaries in metallic alloys often play a crucial role, not only in determining the mechanical properties or thermal stability of alloys, but also in dictating the phase transformation kinetics during thermomechanical processing. We demonstrate that locally stabilized structure and compositional segregation at grain boundaries—“grain boundary complexions”—in a complex multicomponent alloy can be modified to influence the kinetics of cellular transformation during subsequent thermomechanical processing. Using aberration-corrected scanning transmission electron microscopy and atom probe tomography analysis of a metallic nuclear fuel highly relevant to worldwide nuclear non-proliferation efforts —uranium-10 wt% molybdenum (U-10Mo) alloy, new evidence for the existence of grainmore »« less
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Grain boundary engineering to control the discontinuous precipitation in multicomponent U10Mo alloy

Journal Article Devaraj, Arun ; Kovarik, Libor ; Kautz, Elizabeth ; ... - Acta Materialia

Here, we demonstrate here that locally stabilized structure and compositional segregation at grain boundaries in a complex multicomponent alloy can be modified using high temperature homogenization treatment to influence the kinetics of phase transformations initiating from grain boundaries during subsequent low temperature annealing. Using aberration-corrected scanning transmission electron microscopy and atom probe tomography of a model multicomponent metallic alloy —uranium-10 wt% molybdenum (U-10Mo) a nuclear fuel, that is highly relevant to worldwide nuclear non-proliferation efforts, we demonstrate the ability to change the structure and compositional segregation at grain boundary, which then controls the subsequent discontinuous precipitation kinetics during sub-eutectoid annealing.more »« less
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Kinetics of cellular transformation and competing precipitation mechanisms during sub-eutectoid annealing of U10Mo alloys

Journal Article Jana, S. ; Devaraj, A. ; Kovarik, L. ; ... - Journal of Alloys and Compounds
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DOI: 10.1016/j.jallcom.2017.06.292
Kinetics of cellular transformation and competing precipitation mechanisms during sub-eutectoid annealing of U10Mo alloys

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Transformation kinetics of metastable body-centered cubic γ-UMo phase in U-10 wt.percent Mo alloy during annealing at sub-eutectoid temperatures of 500C and 400C has been determined as a function of time using detailed microstructural characterization by scanning electron microscopy, X-ray diffraction analysis, scanning transmission electron microscopy, and atom probe tomography. Based on the results, we found that the phase transformation is initiated by cellular transformation at both the temperatures, which results in formation of a lamellar microstructure along prior γ-UMo grain boundaries.
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