Oxidation mechanism of refractory high entropy alloys Ta-Mo-Cr-Ti-Al with varying Ta content

Autor:	H.-J. Christ, Stephan Laube, Martin Heilmaier, Alexander Kauffmann, Steven Schellert, Bronislava Gorr
Jazyk:	angličtina
Rok vydání:	2021
Předmět:	Materials science General Chemical Engineering High entropy alloys Diffusion Analytical chemistry Evaporation chemistry.chemical_element General Chemistry Rate equation Oxygen Corrosion chemistry Refractory General Materials Science ddc:620 Oxidation resistance Engineering & allied operations
Zdroj:	Corrosion science, 192, Article no: 109861
ISSN:	0010-938X
Popis:	The effect of Ta on the oxidation resistance of the alloys Tax-(Mo-Cr-Ti-Al)1−x (x=0; 5; 10; 15; 20 at%) in air at 1200 °C was examined. The oxidation behavior improves continuously with the increasing Ta concentration. Alloys with Ta concentrations Ta≤10 at% exhibit poor oxidation. Severe evaporation of MoO3 occurred which was quantitatively estimated. The evaporation of MoO3 is drastically reduced in alloys with the higher Ta concentrations. At 15 and 20 at% Ta, protective CrTaO4 scales are found. The CrTaO4 scale formed on Ta20-(Mo-Cr-Ti-Al)80 grows according to the parabolic rate law as a result of oxygen inward diffusion.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b3a93e92bd5fdce8b1efd06a42f5e576 https://publikationen.bibliothek.kit.edu/1000137679 Zobrazit plný text záznamu Full Text from ScienceDirect