| People | Locations | Statistics |
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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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Gheno, Thomas
Office National d'Études et de Recherches Aérospatiales
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (17/17 displayed)
- 2024Modeling the Role of the Grain Structure in the Oxidation of Polycrystals
- 2024Effects of Al and refractory alloying elements (W, Ta and Hf) on oxidation kinetics, oxygen dissolution and diffusion in titanium alloyscitations
- 2024Combining experiments and simulations to study high temperature corrosion: data, models, tools
- 2023Kinetics of Alloy Depletion During Selective Oxidation in Polycrystalscitations
- 2023Effect of refractory elements and of aluminium on oxygen diffusion and solubility in Titanium alloys: experiments and first-principles calculations
- 2022Simulation of diffusion with non-equilibrium vacancies, Kirkendall shift and porosity in single-phase alloyscitations
- 2021Alumina Failure and Post-failure Oxidation in the NiCoCrAlY Alloy System at High Temperaturecitations
- 2021Alumina Failure and Post-failure Oxidation in the NiCoCrAlY Alloy System at High Temperaturecitations
- 2020Oxidation Behavior of a Spark Plasma Sintered Ti–48Al–2W–0.1B Alloy at 800 °Ccitations
- 2020On the role of surface deformation in the oxidation of NiCr alloys at 340–600 °C ; Sur le rôle de la déformation de surface dans l'oxydation des alliages NiCr à 340-600 °Ccitations
- 2018Revisiting the role of substrate microstructure and short-circuit diffusion in the oxidation of Ni-Cr alloys
- 2018On the Simulation of Composition Profiles in NiCoCrAl Alloys During Al2O3 Scale Growth in Oxidation and Oxidation-Dissolution Regimescitations
- 2017Kinetics of Al2O3-Scale Growth by Oxidation and Dissolution in Molten Silicate
- 2017Modes of Deposit-Induced Accelerated Attack of MCrAlY Systems at 1100 °Ccitations
- 2016On the Reaction Mechanism of MCrAlY Alloys with Oxide–Sulfate Deposits at 1100 °Ccitations
- 2013Kinetics of breakaway oxidation of Fe–Cr and Fe–Cr–Ni alloys in dry and wet carbon dioxidecitations
- 2012Oxidation and carburisation of model chromia-forming alloys in carbon dioxide
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article
Simulation of diffusion with non-equilibrium vacancies, Kirkendall shift and porosity in single-phase alloys
Abstract
International audience ; In an alloy subject to vacancy-mediated diffusion, differences in intrinsic diffusivities tend to produce vacancy excess and deficit. These are accommodated by mechanisms such as dislocation climb and pore formation. This is of concern in high temperature alloy-coating systems used in industrial applications, as pores may develop at the interface between the alloy and the coating, which is undesired. This paper presents a multicomponent diffusion model with two types of vacancy sinks/sources: one is associated with dislocation climb and generates lattice shift, the other one is associated with porosity increase/decrease. The model is designed toward a 1D implementation, and porosity is described with a local average volume fraction. Thermodynamic properties and mobility are modeled according to the Calphad method to allow application to multicomponent engineering materials. Finite-difference simulations run on two binary systems, NiCr and NiSi, illustrate the role of the two types of sinks in interdiffusion and pore development. Diffusion is found to be more sensitive to the sink strengths in the NiSi system, where intrinsic diffusivities have a stronger composition dependence. This work provides a basis for the evaluation of the parameters involved in vacancy generation/annihilation (e.g. dislocation density) from experimental data, such as concentration profiles obtained from diffusion couple experiments, and for the prediction of porosity in engineering materials.Traduction