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High Entropy Materials: From Fundamentals to Applications
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High Entropy Materials: From Fundamentals to Applications

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Materials Chemistry".

Deadline for manuscript submissions: closed (31 May 2021) | Viewed by 11290

Special Issue Editor

Dr. Nikita Stepanov

E-Mail Website
Guest Editor
Lab. of Bulk Nanostructured Materials, Belgorod State University, 85 Pobeda str, 308015 Belgorod, Russia
Interests: high entropy alloys; alloy design; thermomechanical processing; microstructure; mechanical properties
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

High entropy materials (HEMs) have recently become a major research topic in materials science. Although initial attention has been mostly focused on high entropy alloys, other types of HEMs, such as high entropy ceramics or high entropy coatings, are also explored now. HEMs are different from conventional materials in their complex, multicomponent chemical composition. It is believed that due to the complex compositions high entropy alloys, ceramics, and coatings can possess unique structures and properties, not readily available in conventional materials. Therefore they are considered as promising materials for a variety of demanding applications.

However, there are plenty of fundamental questions related to HEMs that not have been solved yet. For instance, the thermodynamics of HEMs is not completely understood at the moment, and thus the accurate prediction of phase formation is impossible. In addition, such phenomena, such as solid solution strengthening or diffusion, require additional studies. Meanwhile, for practical applications much better understanding of composition-structure-properties relationships in HEMs is required to select the most promising materials, their suitable fabrication methods and processing routes.

This Special Issue welcomes the original research and reviews on a variety of research topics concerning different types HEMs, including alloys, ceramics, and others. Papers on fundamental aspects of HEMs behavior and application-oriented research, experimental and theoretical articles are equally anticipated. I hope that this Special Issue will provide a valuable platform to share new findings and ideas in the HEMs field.

Dr. Nikita Stepanov
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • high entropy materials
  • high entropy alloys
  • high entropy ceramics
  • high entropy coatings
  • phase formation
  • composition-structure-properties relationships

Published Papers (3 papers)

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Research

14 pages, 3703 KiB  
Article
Microstructure, Thermal, and Corrosion Behavior of the AlAgCuNiSnTi Equiatomic Multicomponent Alloy
by Eva Fazakas, Bela Varga, Victor Geantă, Tibor Berecz, Péter Jenei, Ionelia Voiculescu, Mihaela Coșniță and Radu Ștefănoiu
Materials 2019, 12(6), 926; https://doi.org/10.3390/ma12060926 - 20 Mar 2019
Cited by 12 | Viewed by 2618
Abstract
The paper presents the microstructure and corrosion behavior of an AlTiNiCuAgSn new equiatomic multicomponent alloy. The alloy was obtained using the vacuum arc remelting (VAR) technique in MRF-ABJ900 equipment. The microstructural analysis was performed by optical and scanning electron microscopy (SEM microscope, SEM-EDS) [...] Read more.
The paper presents the microstructure and corrosion behavior of an AlTiNiCuAgSn new equiatomic multicomponent alloy. The alloy was obtained using the vacuum arc remelting (VAR) technique in MRF-ABJ900 equipment. The microstructural analysis was performed by optical and scanning electron microscopy (SEM microscope, SEM-EDS) and the phase transformations were highlighted by dilatometric analysis and differential thermal analysis (DTA). The results show that the as-cast alloy microstructure is three-phase, with an average microhardness of 487 HV0.1/15. The obtained alloy could be included in the group of compositionally complex alloys (CCA). The corrosion resistance was studied using the potentiodynamic method in saline solution with 3.5% NaCl. Considering the high corrosion resistance, the obtained alloy can be used for surface coating applications. Full article
(This article belongs to the Special Issue High Entropy Materials: From Fundamentals to Applications)
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8 pages, 1387 KiB  
Article
Influence of Deposition Temperature on the Phase Evolution of HfNbTiVZr High-Entropy Thin Films
by Stefan Fritze, Christian M. Koller, Linus von Fieandt, Paulius Malinovskis, Kristina Johansson, Erik Lewin, Paul H. Mayrhofer and Ulf Jansson
Materials 2019, 12(4), 587; https://doi.org/10.3390/ma12040587 - 15 Feb 2019
Cited by 33 | Viewed by 3874
Abstract
In this study, we show that the phase formation of HfNbTiVZr high-entropy thin films is strongly influenced by the substrate temperature. Films deposited at room temperature exhibit an amorphous microstructure and are 6.5 GPa hard. With increasing substrate temperature (room temperature to 275 [...] Read more.
In this study, we show that the phase formation of HfNbTiVZr high-entropy thin films is strongly influenced by the substrate temperature. Films deposited at room temperature exhibit an amorphous microstructure and are 6.5 GPa hard. With increasing substrate temperature (room temperature to 275 °C), a transition from an amorphous to a single-phased body-centred cubic (bcc) solid solution occurs, resulting in a hardness increase to 7.9 GPa. A higher deposition temperature (450 °C) leads to the formation of C14 or C15 Laves phase precipitates in the bcc matrix and a further enhancement of mechanical properties with a peak hardness value of 9.2 GPa. These results also show that thin films follow different phase formation pathways compared to HfNbTiVZr bulk alloys. Full article
(This article belongs to the Special Issue High Entropy Materials: From Fundamentals to Applications)
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15 pages, 5057 KiB  
Article
Oxidation Behavior of Refractory AlNbTiVZr0.25 High-Entropy Alloy
by Nikita Yurchenko, Evgeniya Panina, Sergey Zherebtsov, Gennady Salishchev and Nikita Stepanov
Materials 2018, 11(12), 2526; https://doi.org/10.3390/ma11122526 - 12 Dec 2018
Cited by 35 | Viewed by 4142
Abstract
Oxidation behavior of a refractory AlNbTiVZr0.25 high-entropy alloy at 600–900 °C was investigated. At 600–700 °C, two-stage oxidation kinetics was found: Nearly parabolic oxidation (n = 0.46–0.48) at the first stage, transitioned to breakaway oxidation (n = 0.75–0.72) at the second stage. [...] Read more.
Oxidation behavior of a refractory AlNbTiVZr0.25 high-entropy alloy at 600–900 °C was investigated. At 600–700 °C, two-stage oxidation kinetics was found: Nearly parabolic oxidation (n = 0.46–0.48) at the first stage, transitioned to breakaway oxidation (n = 0.75–0.72) at the second stage. At 800 °C, the oxidation kinetics was nearly linear (n = 0.92) throughout the entire duration of testing. At 900 °C, the specimen disintegrated after 50 h of testing. The specific mass gains were estimated to be 7.2, 38.1, and 107.5, and 225.5 mg/cm2 at 600, 700, and 800 °C for 100 h, and 900 °C for 50 h, respectively. Phase compositions and morphology of the oxide scales were analyzed using X-ray diffraction (XRD) and scanning electron microscopy (SEM). It was shown that the surface layer at 600 °C consisted of the V2O5, VO2, TiO2, Nb2O5, and TiNb2O7 oxides. Meanwhile, the scale at 900 °C comprised of complex TiNb2O7, AlNbO4, and Nb2Zr6O17 oxides. The oxidation mechanisms operating at different temperatures were discussed and a comparison of oxidation characteristics with the other alloys was conducted. Full article
(This article belongs to the Special Issue High Entropy Materials: From Fundamentals to Applications)
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