The effect of oxygen partial pressure on dislocation creep in polycrystalline uranium dioxide
| Autor: | Xavière Iltis, Jean-Baptiste Parise, Thomas Helfer, Philippe Garcia, Guy Antou, Audrey Miard |
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| Přispěvatelé: | CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), IRCER - Axe 4 : céramiques sous contraintes environnementales (IRCER-AXE4), Institut de Recherche sur les CERamiques (IRCER), Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Département d'Etudes des Combustibles (DEC), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) |
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Dislocation creep Materials science Uranium dioxide Thermodynamics chemistry.chemical_element [CHIM.MATE]Chemical Sciences/Material chemistry 02 engineering and technology Partial pressure Strain hardening exponent 021001 nanoscience & nanotechnology 01 natural sciences Oxygen [SPI.MAT]Engineering Sciences [physics]/Materials Stress (mechanics) chemistry.chemical_compound Creep chemistry Finite strain theory 0103 physical sciences Materials Chemistry Ceramics and Composites 0210 nano-technology ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Journal of the European Ceramic Society Journal of the European Ceramic Society, Elsevier, 2021, 41 (3), pp.2124-2133. ⟨10.1016/j.jeurceramsoc.2020.09.005⟩ Journal of the European Ceramic Society, 2021, 41 (3), pp.2124-2133. ⟨10.1016/j.jeurceramsoc.2020.09.005⟩ |
| ISSN: | 0955-2219 |
| DOI: | 10.1016/j.jeurceramsoc.2020.09.005 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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