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- W3083085368 abstract "We report a set of compression test experiments carried out on sintered uranium dioxide at 1500 °C, at constant strain rates and under controlled oxygen partial pressures. The macroscopic data indicate an initial strain hardening stage followed by a quasi steady-state period during which changes in the stress level are sluggish. The data are further interpreted in a continuum mechanics, finite strain framework, in both one and two-dimensional geometries, whence stress and oxygen partial pressure exponents of the creep law are estimated. The stress exponent is indicative of power-law creep. The oxygen partial pressure exponent is consistent with a strain-rate limited by vacancy mediated self-diffusion of the slowest moving ion, suggesting a climb-controlled recovery process. Some samples are further characterized using SEM/EBSD which reveals signs of plastic deformation typical of recovery creep. The effect of oxygen pressure upon microstructure is discussed." @default.
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- W3083085368 date "2021-03-01" @default.
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- W3083085368 title "The effect of oxygen partial pressure on dislocation creep in polycrystalline uranium dioxide" @default.
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- W3083085368 doi "https://doi.org/10.1016/j.jeurceramsoc.2020.09.005" @default.
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