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Synthesis and characterization of ceramic high entropy carbide thin films from the Cr-Hf-Mo-Ta-W refractory metal system
Masaryk Univ, Czech Republic; Natl Ctr Nucl Res, Poland.
Masaryk Univ, Czech Republic.
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, Faculty of Science & Engineering. Tech Univ Wien, Austria.
Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, Faculty of Science & Engineering. Tech Univ Wien, Austria.ORCID iD: 0000-0001-7901-4736
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2024 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 485, article id 130839Article in journal (Refereed) Published
Abstract [en]

We use reactive DC magnetron sputtering to showcase synthesis strategies for multicomponent carbides with the NaCl-type fcc structure and illustrate how deposition conditions allow controlling the formation of metallic and ceramic single phases in the Cr-Hf-Mo-Ta-W system. The synthesis is performed in argon flow and different acetylene flows from 0 to 12 sccm, at ambient and elevated temperatures (700 degrees C), respectively, hindering/promoting the adatom diffusion. Structural and microstructural investigations reveal the formation of the bcc metallic phase ( a = 3.188 - 3.209 & Aring;) in films deposited without acetylene flow, also supported by ab initio density function theory (DFT) analysis of lattice parameters as a function of the C content. Experimentally, a bcc-to-fcc phase transition is observed through the formation of an amorphous coating. Contrarily, samples deposited in higher acetylene flow show an fcc multielement carbide phase ( a = 4.33 - 4.49 & Aring;). The crystalline films reveal columnar morphology, while the amorphous ones are very dense. We report promising mechanical properties, with hardness up to 25 +/- 1 GPa. The indentation moduli reach up to 319 +/- 6 GPa and show trends consistent with DFT predictions. Our study paves the path towards the preparation of Cr-Hf-Mo-Ta-W multicomponent carbides by magnetron sputtering, showing promising microstructure as well as mechanical properties.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE SA , 2024. Vol. 485, article id 130839
Keywords [en]
High entropy carbide; High entropy alloy; Multicomponent ceramics; Multicomponent material; Thin film; Magnetron sputtering
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-204912DOI: 10.1016/j.surfcoat.2024.130839ISI: 001240841000001OAI: oai:DiVA.org:liu-204912DiVA, id: diva2:1871689
Note

Funding Agencies|Ministry of Education, Youth and Sports of the Czech Republic [LM2018097]; Czech Science Foundation [GA23-05947S]; European Structural and Investment Funds [VEKOP-2.3.3-15-2016-00002, VEKOP-2.3.2-16-2016-00011]; Austrian Science Fund; FWF [T-1308]; Swedish Research Council [2022-06725, 2018-05973]; Vienna Scientific Cluster (VSC) in Austria [T-1308, 2022-06725]

Available from: 2024-06-17 Created: 2024-06-17 Last updated: 2024-06-17

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Lin, ShuyaoKoutna, Nikola
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