1. Substrate Depletion Analysis and Modeling of the High Temperature Oxidation of Binary Alloys
- Author
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Nicolas Moulin, Patrick Ganster, Krzysztof Wolski, Etienne Marrier, Département Mécanique physique et interfaces (MPI-ENSMSE), École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-SMS, Centre Science des Matériaux et des Structures (SMS-ENSMSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Laboratoire Georges Friedel (LGF-ENSMSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Plasticité, Endommagement et Corrosion des Matériaux (PECM-ENSMSE), and Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-SMS-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Materials science ,Substrate depletion ,Diffusion ,Alloy ,Kinetics ,Oxide ,Thermodynamics ,02 engineering and technology ,Substrate (electronics) ,engineering.material ,01 natural sciences ,[SPI.MAT]Engineering Sciences [physics]/Materials ,Inorganic Chemistry ,[SPI]Engineering Sciences [physics] ,chemistry.chemical_compound ,Flux (metallurgy) ,0103 physical sciences ,Materials Chemistry ,SEGREGATION ,KINETICS ,Oxidation modeling ,Variable interdiffusion coefficient ,010302 applied physics ,Metallurgy ,technology, industry, and agriculture ,Metals and Alloys ,PROFILES ,Binary alloys ,equipment and supplies ,021001 nanoscience & nanotechnology ,DIFFUSION ,chemistry ,Inflection point ,engineering ,METALS ,0210 nano-technology ,Layer (electronics) - Abstract
To predict concentration changes in binary alloy due to preferential oxidation during high temperature oxidation, a model based on the flux balance of the oxidized element at the moving oxide/alloy interface has been developed. These changes are driven by the alloy oxidation rate k c . The model is numerically solved considering different initial alloy concentration profiles and a possible diffusion enhancement effect close to the alloy surface. After validating the model by comparison with Wagner’s analytical solution for Ni30wt%–Pt alloy oxidised at 850 °C, we show that the effects of an initial alloy depletion due to the presence of a passive oxide layer are cancelled after very short oxidation times. We also show that a diffusion acceleration due to work-hardening in the vicinity of the alloy surface induces an inflexion point in the depletion profile.
- Published
- 2013