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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.
Linköpings universitet, Institutionen för fysik, kemi och biologi. Linköpings universitet, Tekniska fakulteten. Tech Univ Wien, Austria.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Teoretisk Fysik. Linköpings universitet, Tekniska fakulteten. Tech Univ Wien, Austria.ORCID-id: 0000-0001-7901-4736
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2024 (Engelska)Ingår i: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 485, artikel-id 130839Artikel i tidskrift (Refereegranskat) 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.

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ELSEVIER SCIENCE SA , 2024. Vol. 485, artikel-id 130839
Nyckelord [en]
High entropy carbide; High entropy alloy; Multicomponent ceramics; Multicomponent material; Thin film; Magnetron sputtering
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Materialkemi
Identifikatorer
URN: urn:nbn:se:liu:diva-204912DOI: 10.1016/j.surfcoat.2024.130839ISI: 001240841000001OAI: oai:DiVA.org:liu-204912DiVA, id: diva2:1871689
Anmärkning

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]

Tillgänglig från: 2024-06-17 Skapad: 2024-06-17 Senast uppdaterad: 2024-06-17

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Lin, ShuyaoKoutna, Nikola
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