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Single-phase high-entropy alloys - an overview

Kozak, Roksolana ; Sologubenko, Alla ; Steurer, Walter

In: Zeitschrift für Kristallographie - Crystalline Materials, 2015, vol. 230, no. 1, p. 55-68

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    Titre
    • Single-phase high-entropy alloys - an overview
    Auteur
    • Kozak, Roksolana. Laboratory of Crystallography, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, 8093 Zurich, Switzerland
    • Sologubenko, Alla. Laboratory of Nanotechnology, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, 8093 Zurich, Switzerland
    • Steurer, Walter. Laboratory of Crystallography, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, 8093 Zurich, Switzerland
    Type de document
    • Postprint
    Langue
    • Inglese
    Publié dans
    • Zeitschrift für Kristallographie - Crystalline Materials, 2015, vol. 230, no. 1, p. 55-68. De Gruyter
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:326365
    Summary
    The term "high-entropy alloys (HEAs)” first appeared about 10 years ago defining alloys composed of n=5-13 principal elements with concentrations of approximately 100/n at.% each. Since then many equiatomic (or near equiatomic) single- and multi-phase multicomponent alloys were developed, which are reported for a combination of tunable properties: high hardness, strength and ductility, oxidation and wear resistance, magnetism, etc. In our paper, we focus on probably single-phase HEAs (solid solutions) out of all HEAs studied so far, discuss ways of their prediction, mechanical properties. In contrast to classical multielement/multiphase alloys, only single-phase multielement alloys (solid solutions) represent the basic concept underlying HEAs as mixing-entropy stabilized homogenous materials. The literature overview is complemented by own studies demonstrating that the alloys CrFeCoNi, CrFeCoNiAl0.3 and PdFeCoNi homogenized at 1300 and 1100°C, respectively, for 1 week are not single-phase HEAs, but a coherent mixture of two solid solutions.