Mechanical Stresses: Inhibitor of Catalyst of High Temperature Oxidation?

Sallès-Desvignes, Isabelle; Montésin, Tony; Favergeon, Jérôme; Bertrand, Gilles

doi:10.4028/www.scientific.net/msf.369-372.451

Cited by 3 publications

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“…25 The first results obtained with this model have shown the great influence of epitaxial strains developed at the metal/oxide interface on the zirconium oxidation kinetics. 25,26 It was also shown that stresses develop in the metal because of oxygen dissolution; taking into account such stresses was proven to be important in order to perform mechanical calculations on the whole system, particularly when oxidation temperature is above 773 K. So in order to develop the knowledge about the influence of stresses in the metal, we chose to work at 873 K and the first part of this paper will be dedicated to stress/diffusion coupling applied to oxygen diffusion in zirconium alloys, with particular efforts to account for mechanical anisotropy. The second part presents oxide growth simulations performed with particular hypotheses, which allow to study the competitive behavior between oxygen dissolution in the metal and oxidation rate.…”

Section: Introductionmentioning

confidence: 98%

Mechano-Chemical Aspects of High Temperature Oxidation: A Mesoscopic Model Applied to Zirconium Alloys

2005

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A model is developed in order to study the influence of mechanical aspects during high temperature oxidation of zirconium alloys. This model accounts for oxygen diffusion within the metal and across the oxide scale. Much attention is paid on the role of the Zr-O solid solution on oxidation kinetics and on the role of mechanical anisotropy. The model shows that stresses developed in the metal, due to oxygen dissolution, have a strong influence on oxidation rates. In particular, a change of crystallographic orientation of the metal leads to a change in stress gradients which is responsible for differences in oxidation rates. Such results are confirmed by experimental results.

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Section: Introductionmentioning

confidence: 98%

Mechano-Chemical Aspects of High Temperature Oxidation: A Mesoscopic Model Applied to Zirconium Alloys

2005

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“…The previous analyses developed with this reformulation were limited to the volumetric diffusion law. They showed the influence of anisotropy on the kinetic processes of metal oxidation [3,4,5].…”

Section: Introductionmentioning

confidence: 99%

An Interfacial Thermodynamic Model for the Oxidation Kinetics of a Metal: Epitaxial Stress Effects

Garruchet

Montésin

Sabar³

et al. 2004

MSF

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The goal of this work was to introduce a novel thermodynamic approach for the oxidation of metals, which has been developed by considering the methods of non-equilibrium thermodynamics. Our proposition allows the linking between some elementary mechanisms (e.g., diffusion, mechanics) for determining the evolution of the oxidation process of the system. To demonstrate the validity of our approach, we developed a numerical analysis for the oxidation of zirconium. Our results allowed us to determine both the oxidation kinetics and the influence of the epitaxial tensor during the process. The kinetics obtained showed the different behaviours observed experimentally at different time scales.

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High temperature oxidation of zirconium and zircaloy-4 under applied load: Nuclear microprobe study of the growth of the oxide

Berger¹,

Tahhann

Moulin

et al. 2003

Nuclear Instruments and Methods in Physics Research Section B:

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Mechanical Stresses: Inhibitor of Catalyst of High Temperature Oxidation?

Cited by 3 publications

References 0 publications

Mechano-Chemical Aspects of High Temperature Oxidation: A Mesoscopic Model Applied to Zirconium Alloys

Mechano-Chemical Aspects of High Temperature Oxidation: A Mesoscopic Model Applied to Zirconium Alloys

An Interfacial Thermodynamic Model for the Oxidation Kinetics of a Metal: Epitaxial Stress Effects

High temperature oxidation of zirconium and zircaloy-4 under applied load: Nuclear microprobe study of the growth of the oxide

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