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Showing 1 to 6 of 6 for “"hydride precipitation"”.
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Electrical Resistance Studies of Hydrogen Diffusion and of Hydride Precipitation in Niobium
… with previous results. Deformation indiced by hydride precipitation and by cold work removed the curvature, and increased the fitted values of Do and Q in D = D(,o)e('-Q/kT). These effects are considered to be due to dislocation trapping of H. The undeformed data were fit to the Flynn-Stoneham …
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X-Ray Topographic Studies of Deformation in Niobium and Dilute Niobium-Hydrogen Alloys
… at a notch under tensile loading and by hydride precipitation has been conducted with x-ray diffraction topography. Lang topography, asymmetric crystal topography (ACT) and synchrotron white beam topography (WBT) were applied in this study. Crystals suitable for transmission x-ray …
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Predicting the Influence of Hydrogen on Zirconium
… at regions of localised high tensile stress. Hydride precipitates at these flaws when the solubility limit of hydrogen in the alloy is exceeded. A change of phase accompanies the precipitation of the brittle hydrides resulting in change in the mechanical properties of the alloy as well as …
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Microstructure-informed modeling of hydrogen diffusion in zirconium polycrystals
… and a brittle phase known as zirconium hydride forms. This phase severely deteriorates the mechanical properties of zirconium alloys, leading to safety concerns regarding the integrity of nuclear pressure tubes. This thesis uses a crystal plasticity finite element model coupled with …
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Investigation effect of external stress on hydrogen solvus in a zircaloy-4 fuel cladding alloy: application of in situ diffraction technique and mesoscale phase-field simulation
… (LWRs). However, the formation of the zirconium hydride phase in the cladding significantly degrades its mechanical properties by reducing the local ductility and initiating crack propagation. Therefore, one of the current fuel performance modeling efforts is to simulate the degradation of the …
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Fuel performance modeling of high burnup mixed oxide fuel for hard spectrum LWRs
… corrosion, hot pressing, gaseous fuel swelling, hydride precipitation and hydrogen migration in the cladding. Semi-empirical models describing porosity and cesium migration behaviors have been replaced with mechanistic models. All of these phenomena have been successfully implemented in a …