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Article Dans Une Revue Philosophical Magazine Letters Année : 2007

Precipitation of niobium carbonitrides in ferrite: chemical composition measurements and thermodynamic modelling

Résumé

High-resolution transmission electron microscopy and electron-energy loss spectroscopy have been used to characterize the structure and chemical composition of niobium carbonitrides in the ferrite of a Fe–Nb–C–N model alloy at different precipitation stages. Experiments seem to indicate the coexistence of two types of precipitates: pure niobium nitrides and mixed substoichiometric niobium carbonitrides. In order to understand the chemical composition of these precipitates, a thermodynamic formalism has been developed to evaluate the nucleation and growth rates (classical nucleation theory) and the chemical composition of nuclei and existing precipitates. A model based on the numerical solution of thermodynamic and kinetic equations is used to compute the evolution of the precipitate size distribution at a given temperature. The predicted compositions are in very good agreement with experimental results.

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Matériaux
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hal-03592206 , version 1 (01-03-2022)

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Michel Perez, Eglantine Courtois, Daniel Acevedo, Thierry Epicier, Philippe Maugis. Precipitation of niobium carbonitrides in ferrite: chemical composition measurements and thermodynamic modelling. Philosophical Magazine Letters, 2007, 87 (9), pp.645-656. ⟨10.1080/09500830701427003⟩. ⟨hal-03592206⟩
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