Advances in the Physical Metallurgy of Uranium and Its Alloys

Chiswik, H.H.; Dwight, A.E.; Lloyd, L.T.; Nevitt, M. V.; Zegler, S.T.

doi:10.2172/4322509

Cited by 10 publications

(8 citation statements)

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“…This indicates that stresses imposed on the metal grains immediately adjoining a hydride growth centre exceeded the threshold value required for the initiation of twinning, i.e. 0.024 Kg mm -2 as reported for 600°C by Chiswik et al [30].…”

Section: Cross-section Investigation Of Hydride Growthssupporting

confidence: 51%

Structural deformation of metallic uranium surrounding hydride growth sites

2015

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. ABSTRACTElectron backscatter diffraction (EBSD) was utilised to probe the microstructure of uranium metal in the vicinity of surface corrosion pits, resulting from hydrogen exposure (5×10 4 Pa, at 240°C).Microstructural analysis of the surface revealed a subtle increase of grain orientation variation for grains at the border of the hydride growths. Cross sectional analysis, at pit sites, revealed significant microstructure deformation in the form of crystal twinning and micro-cracking beneath the surface. These observations provide qualitative evidence that local stress intensities generated as a consequence of hydride growth and confinement, were sufficient to cause deformation within the parent metal.

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Section: Cross-section Investigation Of Hydride Growthssupporting

confidence: 51%

Structural deformation of metallic uranium surrounding hydride growth sites

2015

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“…The faceted precipitate was found to have an approximately 25Å size in the <100> directions and 21Å size in the <110> directions. This behavior shows the thermodynamic driving force toward the spherical precipitates observed experimentally [5,7,8,[46][47][48][49] and shown in Fig. 1c.…”

Section: Uranium-rich Compositionssupporting

confidence: 57%

“…As the temperature increases even higher, the precipitation remains in the stable bcc band-like structure, but the separated uranium begins to change from bcc to a more liquid state. The band-like atomistic configuration shows the thermodynamic driving force to the lamellar [1][2][3] and acicular [5,7,8,46,47,50,51] microstructures observed experimentally and shown in Fig. 1a and Fig.…”

Section: Uranium-rich Compositionsmentioning

confidence: 70%

Atomistic mechanisms of morphological evolution and segregation in U-Zr alloys

et al. 2016

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In many metallic alloys, complex microstructures form as a consequence of local atomic ordering that depends on the processing path. This research uses an atomistic approach to study microstructural morphology and evolution in order to investigate how temperature and alloy concentration affect ordering. A semi-empirical Modified Embedded Atom Method (MEAM) is used in conjunction with molecular dynamics (MD) and Monte Carlo (MC) simulations to investigate the properties and equilibrium configurations of the high temperature body-centered-cubic (bcc) uranium-zirconium (U-Zr) alloys. Atomic simulations conducted with the MEAM potential show the thermodynamic driving force to the lamellar structure for the melt-casted U-rich alloys and the finely acicular microstructure of the water quenched U-rich alloys. In addition, when the U-rich U-Zr alloy is equilibrated at a lower temperature, the lamellar/acicular microstructures begin to spheroidize, as observed in experiments. In the intermediate Zr concentration region, the ordering seen is able to facilitate the structure to the partially ordered δ-UZr 2 phase seen experimentally. Lastly, the Zr-rich region is able to successfully show the thermodynamic driving force to the acicular, Widmanstätten, and martensitic needles type microstructures observed experimentally. These simulations are able to successfully replicate some of the fundamental thermo-physical and microstructural characteristics following fabrication and irradiation of the U-Zr metallic fuels.

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“…Klepfer and Chiotti (6) while the remaining data are taken from the critical evaluation of Klein (3)* Ïïpanltm-Rhanium Alloy# Technology Dlrtnlim la Alloyed to enhance desired properties or to investigate compositions that are interesting from a funda mental or practical viewpoint. The reasons most commonly cited for alloying to enhance desired properties are to con fer thermal or irradiation stability and to obtain corrosion resistance, Ohiswik (8) points out that the approach in the use of alloying to improve dimensional stability and corrosion resistance has been in two directions: (a) alloy additions in relatively low concentrations designed to modify the kinetics of the /3 or "if phase decon^osltlon so as to yield a structure combining random orientation and small grain size; and (b) alloy additions in sufficient con centrations to stabilize partially or completely the cubic V phase* thereby circumventing the intrinsic instability of the ortborhombic oc structure. The first group may be referred to as **qc-phase" alloys, the second group as "fphase" alloys* By restricting the alloy additions to low concentrations and to elements of favorable nuclear proper ties, the "oc-phase" alloys are best suited for the utiliza tion of natural or slightly enriched uranium In thermal reactors.…”

Section: Constituent Metals Historicalmentioning

confidence: 99%

Structures and transformation kinetics of phases in the uranium-rhenium alloy system

Jackson

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Advances in the Physical Metallurgy of Uranium and Its Alloys

Cited by 10 publications

References 0 publications

Structural deformation of metallic uranium surrounding hydride growth sites

Structural deformation of metallic uranium surrounding hydride growth sites

Atomistic mechanisms of morphological evolution and segregation in U-Zr alloys

Structures and transformation kinetics of phases in the uranium-rhenium alloy system

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