Search Results - "OKUNIEWSKI, M. A"

High energy X-ray diffraction measurement of residual stresses in a monolithic aluminum clad uranium―10 wt% molybdenum fuel plate assembly by BROWN, D. W, OKUNIEWSKI, M. A, ALMER, J. D, BALOGH, L, CLAUSEN, B, OKASINSKI, J. S, RABIN, B. H

“…Residual stresses are expected in monolithic, aluminum clad uranium 10 wt% molybdenum (U-10Mo) nuclear fuel plates because of the large mismatch in thermal…”
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Thermotransport in γ(bcc) U–Zr alloys: A phase-field model study by Mohanty, R.R., Bush, J., Okuniewski, M.A., Sohn, Y.H.

“…Atomic transport in the presence of a temperature gradient, commonly known as thermotransport or the thermomigration phenomenon, was simulated for U–Zr alloys…”
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In Situ Neutron Diffraction Study of Crystallographic Evolution and Thermal Expansion Coefficients in U-22.5 at.%Zr During Annealing by Williams, W. J., Okuniewski, M. A., Vogel, S. C., Zhang, J.

“…A uranium-22.5 at.%zirconium (U-10 wt.%Zr) ingot was manufactured by traditional arc casting. The sample was characterized by high-pressure…”
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Elastic Properties of Rolled Uranium -- 10 wt.% Molybdenum Nuclear Fuel Foils by D. W. Brown, D. J. Alexander, K. D. Clarke, B. Clausen, M. A. Okuniewski, T. A. Sisneros

“…In situ neutron diffraction data was collected during elastic loading of rolled foils of uranium-10 wt.% molybdenum bonded to a thin layer of zirconium…”
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Atomistic mechanisms of morphological evolution and segregation in U-Zr alloys by Moore, A.P., Deo, C., Baskes, M.I., Okuniewski, M.A.

“…In many metallic alloys, complex microstructures form as a consequence of local atomic ordering that depends on the processing path. This research uses an…”
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Understanding the uncertainty of interatomic potentials’ parameters and formalism by Moore, A.P., Deo, C., Baskes, M.I., Okuniewski, M.A., McDowell, D.L.

“…[Display omitted] •Sensitivity analyses are used to examine the uncertainty in MEAM potentials.•Trends and significance of parameters’ effects on properties…”
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Neutron diffraction measurement of residual stresses, dislocation density and texture in Zr-bonded U-10Mo “mini” fuel foils and plates by Brown, D.W., Okuniewski, M.A., Sisneros, T.A., Clausen, B., Moore, G.A., Balogh, L.

“…Al clad U-10Mo fuel plates are being considered for conversion of several research reactors from high-enriched to low-enriched U fuel. Neutron diffraction…”
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Phase transformations and thermal expansion coefficients of unirradiated U-X wt.% Zr (X = 6, 10, 20, 30) measured via neutron diffraction by Williams, W.J., Vogel, S.C., Okuniewski, M.A.

“…This work characterizes the crystallographic evolution of unirradiated U-X wt.% Zr (X = 6, 10, 20, 30) while cooling from equilibration, single phase γ-U-Zr,…”
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A modern reappraisal of the U-Zr phase diagram by Williams, W.J., Lund, J., García, R.E., Okuniewski, M.A.

“…•Optimized thermodynamic parameters and constructed U-Zr phase diagrams (PD) via ML.•Comparing historical PDs with experimental data identified a need for…”
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Assessment of swelling and constituent redistribution in uranium-zirconium fuel using phenomena identification and ranking tables (PIRT) by Williams, W.J., Wachs, D.M., Okuniewski, M.A., van den Berghe, S.

“…•Identified four performance issues that may limit uranium-zirconium fuel lifetime.•Constituent redistribution and fuel swelling in uranium-zirconium were…”
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Atomistic modeling of high temperature uranium–zirconium alloy structure and thermodynamics by Moore, A.P., Beeler, B., Deo, C., Baskes, M.I., Okuniewski, M.A.

“…A semi-empirical Modified Embedded Atom Method (MEAM) potential is developed for application to the high temperature body-centered-cubic uranium–zirconium…”
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Neutron diffraction measurement of residual stresses in Al-clad U–10Mo fuel plates by Brown, D.W., Okuniewski, M.A., Clausen, B., Moore, G.A., Sisneros, T.A.

“…Neutron diffraction was used to determine residual stress in monolithic two Al-clad U 10 weight percent Mo mini-fuel plates and a full sized fuel plate. One…”
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Impurity migration and effects on vacancy formation enthalpy in polycrystalline depleted uranium by Lund, K.R., Lynn, K.G., Weber, M.H., Macchi, C., Somoza, A., Juan, A., Okuniewski, M.A.

“…We have used Doppler-broadening of the positron-electron annihilation radiation technique and VASP calculations to verify the previously reported vacancy…”
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Thermotransport in y(bcc) U–Zr alloys: A phase-field model study by R. R. Mohanty, J. Bush, M. A. Okuniewski, Y. H. Sohn

“…Atomic transport in the presence of a temperature gradient, commonly known as thermotransport or the thermomigration phenomenon, was simulated for U-Zr alloys…”
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Small-angle X-ray scattering measurements of helium-bubble formation in borosilicate glass by Terekhov, Alexander Y., Heuser, Brent J., Okuniewski, Maria A., Averback, Robert S., Seifert, Söenke, Jemian, Pete R.

“…Small‐angle X‐ray scattering (SAXS) measurements have been performed to study helium‐bubble formation in borosilicate glass. Helium was introduced by He+…”
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Positron annihilation spectroscopy of proton irradiated single crystal BCC iron by Okuniewski, Maria A., Wells, Doug P., Selim, Farida A., Maloy, Stuart A., James, Michael R., Stubbins, James F., Deo, Chaitanya S., Srivilliputhur, Srinivasan G., Baskes, Michael I.

“…Positron annihilation spectroscopy was used to analyze the open-volume defects created in single crystal, body-centered cubic iron irradiated with 1.0 MeV…”
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