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Thermal Stability of the HfNbTiVZr High-Entropy Alloy
Uppsala Univ, Angstrom Lab, Dept Chem, Box 523, SE-75120 Uppsala, Sweden..ORCID iD: 0000-0001-8500-1632
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0003-4221-8510
Uppsala Univ, Angstrom Lab, Dept Chem, Box 523, SE-75120 Uppsala, Sweden..
Uppsala Univ, Angstrom Lab, Dept Chem, Box 523, SE-75120 Uppsala, Sweden..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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Biochemistry and Molecular Biology
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URN: urn:nbn:se:kth:diva-242244DOI: 10.1021/acs.inorgchem.8b02957ISI: 000455289000093PubMedID: 30525533Scopus ID: 2-s2.0-85058647202OAI: oai:DiVA.org:kth-242244DiVA, id: diva2:1283733
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QC 20190129

Available from: 2019-01-29 Created: 2019-01-29 Last updated: 2019-01-29Bibliographically approved

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