Microstructure evolution and catalytic activity of AlCo 1-x FeNiTiMo x high entropy alloys fabricated by powder metallurgy route.

Autor: Sveda M; HUN-REN-ME Materials Science Research Group, University of Miskolc, Miskolc, Hungary., Kristály F; Department of Geology and Mineral Deposits, University of Miskolc, Miskolc, Hungary., Sikora E; Institute of Chemistry, University of Miskolc, Miskolc, Hungary., Sycheva A; HUN-REN-ME Materials Science Research Group, University of Miskolc, Miskolc, Hungary., Karacs G; HUN-REN-ME Materials Science Research Group, University of Miskolc, Miskolc, Hungary., Ferenczi T; Institute of Foundry and Metallurgy, University of Miskolc, Miskolc, Hungary., Janovszky D; HUN-REN-ME Materials Science Research Group, University of Miskolc, Miskolc, Hungary. fekjd@uni-miskolc.hu.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2024 Sep 19; Vol. 14 (1), pp. 21908. Date of Electronic Publication: 2024 Sep 19.
DOI: 10.1038/s41598-024-72869-z
Abstrakt: This investigation presents the synthesis of equiatomic and non-equiatomic AlCo 1-x FeNiTiMo x (x = 0, 0.1, 0.25 and 1.0) high entropy alloys fabricated by mechanical alloying. Mo partially replaced Co. Classic thermodynamic calculations, such as mixing enthalpy (ΔH mix) , configurational entropy (ΔS mix ), the atomic size difference (δ), entropy to enthalpy ratio (Ω), electronegativity difference (△χ), and valence electron concentration (VEC) were used. Considering δ, Ω and VEC parameters, a BCC solid solution and an intermetallic phase can be predicted due to the partial replacement of Co by Mo. X-ray and electron diffraction of equiatomic HEA without Mo content revealed that after 35 h of milling, a Fe-type BCC lattice phase was formed in the alloy and two L2 1 phases, in addition to a minimal amount of FCC phase. As the Mo content increased, the Fe-type BCC phase was steadily replaced by the Mo-type BCC phase and the Fe-type FCC phase, and two L2 1 phases were also developed. When the 5 at% Mo-containing (x = 0.25) alloy was further milled for 80 h, the amount of phases remained almost the same; only the grain size was strongly reduced. The influence of the Mo addition on the properties of studied alloys was also confirmed in the decolourisation of Rhodamine B using a modified photo-Fenton process. The decolourisation efficiency within 20 min was 72% for AlCoFeNiTi and 87% for AlCo 0.75 FeNiTiMo 0.25 using UV light with 365 nm wavelength.
(© 2024. The Author(s).)
Databáze: MEDLINE
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