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Experimental and thermodynamic analysis of differences in phase transformation of Pt-modified nickel aluminide coating during isothermal and cyclic oxidation

Abstract : Phase transformation of Pt-modified nickel aluminide coating β-(Ni,Pt)Al into γ′ phase was studied during isothermal and cyclic oxidation at 1100 °C. The transformation occurred with homogeneous β and γ′ phases with chemical compositions depending on oxidation conditions. Cyclic oxidation led to a higher volume fraction of topologically close-packed (TCP) phases formed in the interdiffusion zone and the chemical composition of TCP phases was found to vary with oxidation conditions. This difference in TCP precipitation in the interdiffusion zone for isothermal and cyclic oxidation was suggested to be responsible for different β and γ′ compositions. The experimental observations were discussed using thermodynamic calculations by Thermo-Calc software, and some explanations were given.
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https://hal-mines-paristech.archives-ouvertes.fr/hal-01421908
Contributeur : Bibliothèque Umr7633 <>
Soumis le : vendredi 23 décembre 2016 - 11:08:13
Dernière modification le : jeudi 24 septembre 2020 - 18:30:07

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Vladimir A. Esin, Fabrice Gaslain. Experimental and thermodynamic analysis of differences in phase transformation of Pt-modified nickel aluminide coating during isothermal and cyclic oxidation. Surface and Coatings Technology, Elsevier, 2016, 307, pp.915-925. ⟨10.1016/j.surfcoat.2016.10.014⟩. ⟨hal-01421908⟩

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