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The Effect of Al on the Formation of a CrTaO₄ Layer in Refractory High Entropy Alloys Ta-Mo-Cr-Ti-xAl

Schellert, S.; Gorr, B. 1; Christ, H.-J.; Pritzel, C.; Laube, S. ORCID iD icon 1; Kauffmann, A. ORCID iD icon 1; Heilmaier, M. 1
1 Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

In this study, the effect of Al on the high temperature oxidation of Al-containing refractory high entropy alloys (RHEAs) Ta-Mo-Cr-Ti-xAl (x = 5; 10; 15; 20 at%) was examined. Oxidation experiments were performed in air for 24 h at 1200 °C. The oxidation kinetics of the alloy with 5 at% Al is notably affected by the formation of gaseous MoO3 and CrO3, while continuous mass gain was detected for alloys with the higher Al concentrations. The alloys with 15 and 20 at% Al form relatively thin oxide scales and a zone of internal corrosion due to the formation of dense CrTaO4 scales at the interface oxide/substrate. The alloys with 5 and 10 at% Al exhibit, on the contrary, thick and porous oxide scales because of fast growing Ta2O5. The positive influence of Al on the formation of Cr2O3 followed by the growth of CrTaO4 to yield a compact scale is explained by getter and nucleation effects.

Verlagsausgabe §
DOI: 10.5445/IR/1000134515
Veröffentlicht am 30.06.2021
DOI: 10.1007/s11085-021-10046-7
Zitationen: 19
Zitationen: 20
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP)
Institut für Angewandte Materialien (IAM)
Institut für Angewandte Materialien – Werkstoffkunde (IAM-WK)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 0030-770X, 1573-4889
KITopen-ID: 1000134515
HGF-Programm 38.04.01 (POF IV, LK 01) Gas turbines
Erschienen in Oxidation of metals
Verlag Springer
Band 96
Seiten 333-345
Vorab online veröffentlicht am 28.06.2021
Nachgewiesen in Dimensions
Web of Science
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