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Depletion and voids formation in the substrate during high temperature oxidation of Ni-Cr alloys

Desgranges, Clara and Lequien, Florence and Aublant, Edwige and Nastar, Maylise and Monceau, Daniel Depletion and voids formation in the substrate during high temperature oxidation of Ni-Cr alloys. (2013) Oxidation of Metals, 79 (1-2). 93-105. ISSN 0030-770X

(Document in English)

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Official URL: http://dx.doi.org/10.1007/s11085-012-9328-0


A numerical model to treat the kinetics of vacancy annihilation at the metal/oxide interface but also in the bulk metal has been implemented. This was done using EKINOX, which is a mesoscopic scale 1D-code that simulates oxide growth kinetics with explicit calculation of vacancy fluxes. Calculations were performed for high temperature Ni-Cr alloys oxidation forming a single chromia scale. The kinetic parameters used to describe the diffusion in the alloy were directly derived from an atomistic model. Our results showed that the Cr depletion profile can be strongly affected by the cold work state of the alloy. In fact, the oversaturation of vacancies is directly linked to the efficiency of the sinks which is proportional to the density of dislocations. The resulting vacancy profile highlights a supersaturation of vacancy within the metal. Based on the classical nucleation theory, the possibility and the rate of void formation are discussed.

Item Type:Article
Additional Information:Thanks to Springer Verlag editor. The definitive version is available at http://link.springer.com The original PDF can be found at Oxidation of Metals website: http://link.springer.com/article/10.1007%2Fs11085-012-9328-0
HAL Id:hal-03467697
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > AREVA (FRANCE)
French research institutions > Commissariat à l'Energie Atomique et aux énergies alternatives - CEA (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Laboratory name:
Deposited On:23 Sep 2013 10:24

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