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Exploring the high entropy alloy concept in (AlTiVNbCr)N
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, Faculty of Science & Engineering. Saarland University, Germany.
Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, Faculty of Science & Engineering. Saarland University, Germany.
Seco Tools AB, Sweden.
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2017 (English)In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 636, 346-352 p.Article in journal (Refereed) Published
Abstract [en]

We have explored the high entropy alloy (HEA) concept in the AlTiVNbCr-nitride material system. (AlTiVNbCr)N coatings synthesized by reactive cathodic arc deposition are close to an ideal cubic solid solution with a positive mean-field enthalpy of mixing of 0.06 eV/atom. First principle calculations showa higher thermodynamic stability for the solid solution relative to their binaries thereby indicating a possible entropy stabilization at a temperature above 727 degrees C. However, the elevated temperature annealing experiments show that the solid solution decomposes to w-AlN and c-(TiVNbCr)N. The limited thermal stability of the solid solution is investigated in relation to several thermodynamic parameters. We suggest that the HEA designed multiprincipal element (AlTiVNbCr) N solid solutions are in a metastable state. (C) 2017 Published by Elsevier B.V.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 636, 346-352 p.
Keyword [en]
High entropy alloy; Transition metal-Al-N alloys; Atom probe tomography; Ab-initio calculations
National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-140796DOI: 10.1016/j.tsf.2017.06.029ISI: 000408037800050Scopus ID: 2-s2.0-85021320078OAI: oai:DiVA.org:liu-140796DiVA: diva2:1140967
Note

Funding Agencies|Swedish Research Council (VR) [621-2012-4401]; Swedish Foundation for Strategic Research (SSF) through the program MultiFilms [RMA08-0069]; Swedish Government strategic research area grant in material science AFM - SFO MatLiU [2009-00971]; EUs Erasmus Mundus Graduate School in Material Science and Engineering (DocMASE); Swedish Governmental Agency for Innovation Systems (Vinnova) [VINNMer 2011-03464, M-Era.net 2013-02355]; EU [C/4-EFRE-13/2009/Br]; DFG; Federal State Government of Saarland [INST 256/298-1 FUGG]

Available from: 2017-09-13 Created: 2017-09-13 Last updated: 2017-09-19Bibliographically approved

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Yalamanchili, K.Wang, FeiSchramm, IsabellaJohansson Jöesaar, Mats P.Tasnadi, FerencGhafoor, NaureenOdén, Magnus
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