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Thermal Stability of the HfNbTiVZr High-Entropy Alloy
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.ORCID iD: 0000-0001-8500-1632
KTH Royal Inst Technol, Dept Mat Sci & Engn, SE-10044 Stockholm, Sweden.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.ORCID iD: 0000-0003-0336-2560
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2019 (English)In: Inorganic Chemistry, ISSN 0020-1669, E-ISSN 1520-510X, Vol. 58, no 1, p. 811-820Article in journal (Refereed) Published
Abstract [en]

The multicomponent alloy HfNbTiVZr has been described as a single-phase high-entropy alloy (HEA) in the literature, although some authors have reported that additional phases can form during annealing. The thermal stability of this alloy has therefore been investigated with a combination of experimental annealing studies and thermodynamic calculations using the CALPHAD approach. The thermodynamic calculations show that a single-phase HEA is stable above about 830 degrees C. At lower temperatures, the most stable state is a phase mixture of bcc, hcp, and a cubic C15 Laves phase. Annealing experiments followed by quenching confirm the results from thermodynamic calculations with the exception of the Laves phase structure, which was identified as a hexagonal C14 type instead of the cubic C15 type. Limitations of the applied CALPHAD thermodynamic description of the system could be an explanation for this discrepancy. As-synthesized HfNbTiVZr alloys prepared by arc-melting form a single-phase bcc HEA at room temperature. In situ annealing studies of this alloy show that additional phases start to form above 600 degrees C. This indicates that the observed HEA is metastable at room temperature and stabilized by a slow kinetics during cooling. X-ray diffraction analyses using different cooling rates and annealing times show that the phase transformations in this HEA are slow and that completely different phase compositions can be obtained depending on the annealing procedure. In addition, it has been shown that the sample preparation method (mortar grinding, heat treatment, etc.) has a significant influence on the collected diffraction patterns and therefore on the phase identification and analysis.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2019. Vol. 58, no 1, p. 811-820
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Metallurgy and Metallic Materials
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URN: urn:nbn:se:uu:diva-375221DOI: 10.1021/acs.inorgchem.8b02957ISI: 000455289000093PubMedID: 30525533OAI: oai:DiVA.org:uu-375221DiVA, id: diva2:1283845
Funder
Swedish Foundation for Strategic Research Available from: 2019-01-30 Created: 2019-01-30 Last updated: 2019-01-30Bibliographically approved

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Pacheco, VictorKarlsson, DennisCedervall, JohanFritze, StefanEk, GustavBerastegui, PedroSahlberg, MartinJansson, Ulf

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