A high-resolution characterization of the oxide-metal interface in Zircaloy-4 and its relation to the oxidation and hydrogen pickup mechanisms
| Autor: | Rebecca J. Nicholls, Susan Ortner, James Sayers, Sergio Lozano-Perez |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Suboxide
Nuclear and High Energy Physics Materials science Hydrogen Zirconium alloy Oxide chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences 010305 fluids & plasmas Characterization (materials science) Metal chemistry.chemical_compound Nuclear Energy and Engineering chemistry Chemical physics visual_art 0103 physical sciences visual_art.visual_art_medium General Materials Science Density functional theory 0210 nano-technology Layer (electronics) |
| Zdroj: | Journal of Nuclear Materials. 525:72-82 |
| ISSN: | 0022-3115 |
| Popis: | Oxide growth and hydrogen pickup have been measured for Zircaloy-4 in environments of different pH. The metal-oxide interface has been studied at high-resolution over sufficient lengths to show meaningful trends in the behaviour of the ZrO and oxygen-saturated metal layers (suboxides). It was found that suboxide width decreases rapidly at transition, then increases more slowly. The suboxide width is a constant proportion of the dioxide width prior to transition, but drops then increases after transition. Density functional theory was used to predict suboxide stability under different pressures. The behaviour of the suboxide can be explained on the assumption that the dioxide layer is the protective layer until it is bypassed by the environment percolating into the crack network. The relation between hydrogen pickup rate and the oxide behaviour suggests that hydrogen moves across the Zircaloy-4 oxide with no net charge, and that the role of the constrained environment within the cracked fossil oxide requires investigation. |
| Databáze: | OpenAIRE |
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