Oxidation Behavior of Alx(CoCrFeNi)100-x High-Entropy Alloys Under Thermal-Cycling Conditions
| Autor: | Aleksander Gil, Juliusz Dąbrowa, Marek Zajusz, K. Matsuda, Marek Danielewski, Grzegorz Cieślak, Krzysztof Mroczka, Monika Jawańska, M. Stygar, Jerzy Jedlinski, Tadeusz Kulik |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science High entropy alloys Metals and Alloys Oxide Thermodynamics 02 engineering and technology Temperature cycling 021001 nanoscience & nanotechnology 01 natural sciences Inorganic Chemistry Metal chemistry.chemical_compound chemistry visual_art 0103 physical sciences Air atmosphere Materials Chemistry visual_art.visual_art_medium Spallation 0210 nano-technology Internal oxidation Solid solution |
| Zdroj: | Oxidation of Metals. 96:307-321 |
| ISSN: | 1573-4889 0030-770X |
| Popis: | The oxidation behavior of five different high-entropy alloys from the Al–Co–Cr–Fe–Ni metallic system, namely Alx(CoCrFeNi)100-x (x = 0; 3; 6; 9; 12), was studied under thermal-cycling conditions, at 1273 K in air atmosphere. The choice of selected compositions allowed for covering the chromia-to-alumina former transition, as well as the transition from the FCC single-phase solid solution structure to multiphase alloys with Al-enriched B2-structured constituent. The measurements were taken for 500 cycles (1 cycle - 1 h of heating, 20 min of cooling). The results indicate a profound influence of the thermal-cycling conditions on the oxidation products, with extremely complex scale structures and extensive internal oxidation and nitridation zones, as well as severe spallation of the oxide scale in most cases, showing the limited usefulness of these alloys for high-temperature applications at the current stage of their development. |
| Databáze: | OpenAIRE |
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