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Naji, M. |
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Motta, Antonella |
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Aletan, Dirar |
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Mohamed, Tarek |
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Ertürk, Emre |
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Taccardi, Nicola |
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Kononenko, Denys |
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Petrov, R. H. | Madrid |
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Alshaaer, Mazen | Brussels |
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Bih, L. |
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Casati, R. |
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Muller, Hermance |
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Kočí, Jan | Prague |
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Šuljagić, Marija |
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Kalteremidou, Kalliopi-Artemi | Brussels |
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Azam, Siraj |
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Ospanova, Alyiya |
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Blanpain, Bart |
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Ali, M. A. |
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Popa, V. |
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Rančić, M. |
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Ollier, Nadège |
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Azevedo, Nuno Monteiro |
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Landes, Michael |
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Rignanese, Gian-Marco |
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Ni, N.
Imperial College London
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (25/25 displayed)
- 2017Micromechanical strength of individual Al2O3 plateletscitations
- 2017The use of 3d graphene networks for the creation of bio-inspired self-monitoring tough ceramic nanocomposites
- 2017High-Mobility and High-Optical Quality Atomically Thin WS2citations
- 2016Porosity in oxides on zirconium fuel cladding alloys, and its importance in controlling oxidation ratescitations
- 2016An investigation of the oxidation behaviour of zirconium alloys using isotopic tracers and high resolution SIMScitations
- 2016How the crystallography and nanoscale chemistry of the metal/oxide interface develops during the aqueous oxidation of zirconium cladding alloyscitations
- 2016Multi-scale characterisation of oxide on zirconium alloyscitations
- 2016Mechanisms of oxidation of fuel cladding alloys revealed by high resolution APT, TEM and SIMS analysiscitations
- 2016Focussed ion beam sectioning for the 3D characterisation of cracking in oxide scales formed on commercial ZIRLO (TM) alloys during corrosion in high temperature pressurised watercitations
- 2016Studies regarding corrosion mechanisms in zirconium alloyscitations
- 2016The atomic scale structure and chemistry of the zircaloy-4 metal-oxide interface
- 20163D visualisation of crack distributions in oxidised zirconium alloys by FIB-slicingcitations
- 2016Characterizing environmental degradation in PWRs by 3D FIB sequential sectioning
- 2016Quantitative EELS analysis of zirconium alloy metal/oxide interfaces.citations
- 2016Crystal structure of the zro phase at zirconium/zirconium oxide interfacescitations
- 2015The effect of Sn on corrosion mechanisms in advanced Zr-cladding for pressurised water reactorscitations
- 2014Effect of Sn on Corrosion Mechanisms in Advanced Zr-Cladding for Pressurised Water Reactorscitations
- 2013An investigation of the oxidation behaviour of zirconium alloys using isotopic tracers and high resolution SIMScitations
- 2013An investigation of the oxidation behaviour of zirconium alloys using isotopic tracers and high resolution SIMScitations
- 2013The effect of Sn on corrosion mechanisms in advanced Zr-cladding for pressurised water reactors
- 2012How the crystallography and nanoscale chemistry of the metal/oxide interface develops during the aqueous oxidation of zirconium cladding alloyscitations
- 2012How the crystallography and nanoscale chemistry of the metal/oxide interface develops during the aqueous oxidation of zirconium cladding alloyscitations
- 2012Mechanisms of oxidation of fuel cladding alloys revealed by high resolution APT, TEM and SIMS analysiscitations
- 2011Studies regarding corrosion mechanisms in zirconium alloyscitations
- 2011Studies regarding corrosion mechanisms in zirconium alloyscitations
Places of action
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document
Mechanisms of oxidation of fuel cladding alloys revealed by high resolution APT, TEM and SIMS analysis
Abstract
Aqueous corrosion of zirconium alloys has become the major factor limiting prolonged fuel campaigns in nuclear plant. Studies using SEM, TEM and electrochemical impedance measurements have been interpreted as showing a dense inner-most oxide layer, and an increased thickness of the layer has been correlated to a better corrosion resistance. Many authors have reported that an 'intermediate layer' at the metal oxide interface has a complex structure or/and stochiometry different to that of both the bulk oxide and bulk metal, sometimes claimed to be a suboxide phase. Diffraction evidence has suggested the presence of both cubic ZrO and rhombohedral Zr 3O phases, and compositional analysis has revealed similar variations in local oxygen stoichiometry. We have carried out a systematic investigation of the structure and chemistry of the metal/oxide interface in samples of commercial ZIRLO corroded for times up to 180 days. We have developed new experimental techniques for the study of these interfaces both by Electron Energy Loss Spectroscopy (EELS) analysis in the Transmission Electron Microscope (TEM) and by Atom Probe Tomography (APT), and exactly the same samples have been investigated by both techniques. Our results show the development of a clearly defined suboxide layer of stoichiometry close to ZrO, and the subsequent disappearance of this layer at the first of the characteristic 'breakaway' transitions in the oxidation kinetics. We can correlate this behaviour with changes in the structure of the oxide layer, and particularly the development of interconnected porosity that links the corroding interface with the aqueous environment. Using high resolution SIMS analysis of isotopically spiked samples we demonstrate the penetration of the oxidising species through these porous outer oxide layers. © 2012 Materials Research Society.