The Effect of Al on the Formation of a CrTaO4 Layer in Refractory High Entropy Alloys Ta-Mo-Cr-Ti-xAl
| Autor: | Bronislava Gorr, Alexander Kauffmann, Christian Pritzel, H.-J. Christ, Martin Heilmaier, Steven Schellert, Stephan Laube |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Yield (engineering) Materials science High entropy alloys Alloy Metals and Alloys Analytical chemistry Oxide Nucleation 02 engineering and technology Substrate (electronics) engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Corrosion Inorganic Chemistry chemistry.chemical_compound chemistry Getter 0103 physical sciences Materials Chemistry engineering 0210 nano-technology |
| Zdroj: | Oxidation of Metals. 96:333-345 |
| ISSN: | 1573-4889 0030-770X |
| DOI: | 10.1007/s11085-021-10046-7 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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