The Effect of Al on the Formation of a CrTaO4 Layer in Refractory High Entropy Alloys Ta-Mo-Cr-Ti-xAl
In: Oxidation of Metals, Jg. 96 (2021-06-28), S. 333-345
Online
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Zugriff:
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.
Titel: |
The Effect of Al on the Formation of a CrTaO4 Layer in Refractory High Entropy Alloys Ta-Mo-Cr-Ti-xAl
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Autor/in / Beteiligte Person: | Gorr, Bronislava ; Kauffmann, Alexander ; Pritzel, Christian ; Christ, H.-J. ; Heilmaier, Martin ; Schellert, Steven ; Laube, Stephan |
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Zeitschrift: | Oxidation of Metals, Jg. 96 (2021-06-28), S. 333-345 |
Veröffentlichung: | Springer Science and Business Media LLC, 2021 |
Medientyp: | unknown |
ISSN: | 1573-4889 (print) ; 0030-770X (print) |
DOI: | 10.1007/s11085-021-10046-7 |
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