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Open AccessFeature PaperArticle

Transformations in CrFeCoNiCu High Entropy Alloy Thin Films during In-Situ Annealing in TEM

1
Centre for Energy Research of the Hungarian Academy of Sciences, Konkoly-Thege M. u. 29-33, H-1121 Budapest, Hungary
2
Deptartment of Physics, Eötvös Loránd University, Pázmány Péter sétány 1a, H-1117 Budapest, Hungary
3
Institute of Environmental Sciences, University of Pannonia, Egyetem str. 10, H-8200 Veszprém, Hungary
*
Author to whom correspondence should be addressed.
Coatings 2020, 10(1), 60; https://doi.org/10.3390/coatings10010060
Received: 13 December 2019 / Revised: 2 January 2020 / Accepted: 7 January 2020 / Published: 9 January 2020
(This article belongs to the Special Issue Structure and Phase Transformations in Thin Films)
In-situ TEM-heating study of the microstructural evolution of CrFeCoNiCu high entropy alloy (HEA) thin films was carried out and morphological and phase changes were recorded. Post annealing investigation of the samples was carried out by high resolution electron microscopy and EDS measurements. The film is structurally and morphologically stable single phase FCC HEA up to 400 °C. At 450 °C the formation of a BCC phase was observed, however, the morphology of the film remained unchanged. This type of transformation is attributed to diffusionless processes (martensitic or massive). From 550 °C fast morphological and structural changes occur, controlled by volume diffusion processes. Fast growing of a new intermetallic phase is observed which contains mainly Cr and has large unit cell due to chemical ordering of components in <100> direction. The surface of the films gets covered with a CrO-type layer, possibly contributing to corrosion resistance of these. View Full-Text
Keywords: high entropy alloy; in-situ TEM annealing; thermal stability; diffusionless transformation; planar disorder; oxide formation high entropy alloy; in-situ TEM annealing; thermal stability; diffusionless transformation; planar disorder; oxide formation
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Arfaoui, M.; Radnóczi, G.; Kovács Kis, V. Transformations in CrFeCoNiCu High Entropy Alloy Thin Films during In-Situ Annealing in TEM. Coatings 2020, 10, 60.

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