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Investigation of the phase formation in magnetron sputtered hard multicomponent (HfNbTiVZr)C coatings
Uppsala Univ, Dept Chem Angstrom, SE-75121 Uppsala, Sweden..
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. Thermo Calc Software AB, Solna, Sweden..ORCID iD: 0000-0002-8493-9802
Uppsala Univ, Dept Chem Angstrom, SE-75121 Uppsala, Sweden..
Uppsala Univ, Dept Chem Angstrom, SE-75121 Uppsala, Sweden.;Univ Antwerp, Dept Phys, Antwerp, Belgium..
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2022 (English)In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 221, article id 111002Article in journal (Refereed) Published
Abstract [en]

Multicomponent carbides have gained interest especially for ultra-high temperature applications, due to their ceramic hardness, good oxidation resistance and enhanced strength. In this study the phase forma-tion, stability and mechanical properties of (HfNbTiVZr)C multicomponent carbide coatings were inves-tigated. Phase stability was predicted by the CALPHAD (CALculation of PHAse Diagrams) methods. This revealed that the multicomponent solid solution phase is only stable at elevated temperatures, namely above 2400 degrees C. At lower temperatures a phase mixture was predicted, with a particular tendency for V to segregate. Magnetron sputtered thin films deposited at 300 degrees C exhibited a single NaCl-type multicom-ponent carbide phase, which attributes to the kinetic stabilisation of simple structures during thin film growth. Films deposited at 700 degrees C, or exposed to UHV annealing at 1000 degrees C, however, revealed the decom-position of the single-phase multicomponent carbide by partial elemental segregation and formation of additional phases. Thus, confirming the CALPHAD predictions. These results underscore the importance of explicitly considering temperature when discussing the stability of multicomponent carbide materials, as well as the applicability of CALPHAD methods for predicting phase formation and driving forces in these materials. The latter being crucial for designing materials, such as carbides, that are used in appli-cations at elevated temperatures.

Place, publisher, year, edition, pages
ELSEVIER SCI LTD , 2022. Vol. 221, article id 111002
Keywords [en]
High entropy ceramics, Multi -principal element carbide, Multicomponent carbide, Physical vapour deposition (PVD), CALPHAD
National Category
Dentistry Condensed Matter Physics Biomaterials Science
Identifiers
URN: urn:nbn:se:kth:diva-316733DOI: 10.1016/j.matdes.2022.111002ISI: 000839257000004Scopus ID: 2-s2.0-85135406379OAI: oai:DiVA.org:kth-316733DiVA, id: diva2:1691409
Note

QC 20220830

Available from: 2022-08-30 Created: 2022-08-30 Last updated: 2022-08-30Bibliographically approved

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Mao, Huahai

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