Microstructure and oxidation behavior of Co–Cr–Ta ternary alloys
LOUIS ETIENNE, Moreau
Department of Nanoscience and Nanoengineering
Research Center for Structural Materials
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Department of Nanoscience and Nanoengineering
Research Center for Structural Materials
LOUIS ETIENNE, Moreau
Department of Nanoscience and Nanoengineering
Research Center for Structural Materials
Department of Nanoscience and Nanoengineering
Research Center for Structural Materials
HIDEYUKI, Murakami
Research Center for Structural Materials
Department of Nanoscience and Nanoengineering
< Reduce
Research Center for Structural Materials
Department of Nanoscience and Nanoengineering
Language
en
Article de revue
This item was published in
Journal of Alloys and Compounds. 2023-03, vol. 936, p. 167968
Elsevier
English Abstract
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 ...Read more >
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.Read less <
English Keywords
Characterization
Phase diagrams
Data-driven method
CALPHAD method
Oxidation
Origin
Hal imported