Microstructure and oxidation behavior of Co–Cr–Ta ternary alloys - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Alloys and Compounds Année : 2023

Microstructure and oxidation behavior of Co–Cr–Ta ternary alloys

Résumé

The improvement of oxidation resistance of alloys is one of the key points to develop components for ultra-high temperature applications. The formation of a CrTaO4 oxide layer has attracted attention because of its thermal stability and good protection against oxidation above 1000 °C where more commonly used protective oxide layers such as Cr2O3 show their limits. This study investigates the microstructure evolution and oxidation resistance of the Co-Cr-Ta ternary alloys in comparison to the Calphad predictions. The Co-Cr-Ta samples tested here are composed of an FCC Co-rich phase and a C15 laves phase, and an increase of Cr content was linked to the formation and growth of an additional σ phase. Thermogravimetric analysis, together with the isothermal oxidation tests in air at 1200 °C proved that alloys exhibited good oxidation resistance formed a continuous CrTaO4 layer. Also, optimization of Co-Cr-Ta composition with improved oxidation resistance was attempted using data-driven strategy and the results demonstrated the potential of such approach for the future of alloy design.

Domaines

Matériaux
Fichier non déposé

Dates et versions

hal-04049513 , version 1 (28-03-2023)

Identifiants

Citer

Moreau Louis Etienne, Stéphane Gorsse, Guillaume Lambard, Murakami Hideyuki. Microstructure and oxidation behavior of Co–Cr–Ta ternary alloys. Journal of Alloys and Compounds, 2023, 936, pp.167968. ⟨10.1016/j.jallcom.2022.167968⟩. ⟨hal-04049513⟩
19 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More