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Metals
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High-Entropy Phases and Composites Based on Them: Manufacturing, Properties, Applications
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High-Entropy Phases and Composites Based on Them: Manufacturing, Properties, Applications

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: closed (30 November 2021) | Viewed by 4489

Special Issue Editor

Prof. Dr. Evgeny Trofimov

E-Mail Website
Guest Editor
South Ural State University, Chelyabinsk, Russia
Interests: metals; alloys; ceramics; high-entropy phases; thermodynamic analysis; calphad; magnetic properties; phase equilibria

Special Issue Information

Dear Colleagues,

The purpose of this Special Issue is to discuss the problems of creating and investigating the properties and applications of high-entropy phases (HEPh), which primarily include high-entropy alloys, as well as high-entropy ceramics (oxides, nitrides, carbides, etc.).

Both reviews and original research papers will be accepted.

It is planned to publish articles related to obtaining HEPh-based materials, including composite materials. Particular attention will be paid to the use of additive technologies for the production of HEPh-based materials. Theoretical articles on the use of various modeling methods to optimize the compositions and properties of HEPh-based materials will also be published. New theoretical papers on the criteria for the stability of HEPh, as well as new substantiated hypotheses about the possible causes for the manifestation of properties by those phases, will be welcomed.

Articles that describe the unusual properties of HEPh (mechanical, electrical, magnetic, etc.), as well as their corrosion resistance and resistance to ionizing radiation are welcome. Articles that present the results of studies describing the successful use of HEPh-based materials are especially invited.

Prof. Dr. Evgeny Trofimov
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. Metals is an international peer-reviewed open access monthly 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 phases (alloys and ceramics)
  • materials and composites
  • fabrication and processing
  • theoretical modeling and simulation
  • properties
  • industrial applications

Published Papers (2 papers)

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Research

10 pages, 2559 KiB  
Article
In Situ Medium Entropy Intermetallic Reinforced Composite Coating Fabricated by Additive Manufacturing
by Ahmad Ostovari Moghaddam, Nataliya Aleksandrovna Shaburova, Marina Nikolaevna Samodurova, Yuliya Sergeevna Latfulina, Dmitry Vyacheslavovich Mikhailov and Evgeny Alekseevich Trofimov
Metals 2021, 11(7), 1069; https://doi.org/10.3390/met11071069 - 2 Jul 2021
Cited by 7 | Viewed by 1667
Abstract
The possibility of stabilizing different amounts of medium-entropy intermetallic compounds (MEIMCs) within a multicomponent matrix using laser cladding is demonstrated. The results indicated that MEIMC with a B2 structure could be successfully formed within a multicomponent BCC matrix during laser cladding of a [...] Read more.
The possibility of stabilizing different amounts of medium-entropy intermetallic compounds (MEIMCs) within a multicomponent matrix using laser cladding is demonstrated. The results indicated that MEIMC with a B2 structure could be successfully formed within a multicomponent BCC matrix during laser cladding of a proper ratio of Al, Fe, Co, Cu, Mn, and Ni powders. Two coatings with different contents of MEIMC were fabricated by changing the feeding rate of the powder mixture. Based on the X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS) analyses, the Al-rich intermetallic particles were qualitatively identified as (Fe0.55Co0.18Cu0.22Ni0.03Mn0.02)Al MEIMC. It was also found that the feeding rate affects the content of MEIMC, and consequently, the grain structure and microhardness values. Finally, we propose MEIMC-reinforced alloys as a more effective alternative system to be used for fabricating high-performance coatings using laser cladding. Full article
(This article belongs to the Special Issue High-Entropy Phases and Composites Based on Them: Manufacturing, Properties, Applications)
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11 pages, 6566 KiB  
Article
Age Heat Treatment of Al0.5CoCrFe1.5NiTi0.5 High-Entropy Alloy
by Che-Fu Lee and Tao-Tsung Shun
Metals 2021, 11(1), 91; https://doi.org/10.3390/met11010091 - 5 Jan 2021
Cited by 5 | Viewed by 2209
Abstract
In this study, Al0.5CoCrFe1.5NiTi0.5 high-entropy alloy was heat-treated from 500 °C to 1200 °C for 24 h to investigate age-hardening phenomena and microstructure evolution. The as-cast alloy, with a hardness of HV430, exhibited a dendritic structure comprising an [...] Read more.
In this study, Al0.5CoCrFe1.5NiTi0.5 high-entropy alloy was heat-treated from 500 °C to 1200 °C for 24 h to investigate age-hardening phenomena and microstructure evolution. The as-cast alloy, with a hardness of HV430, exhibited a dendritic structure comprising an (Fe,Cr)-rich FCC phase and a (Ni,Al,Ti)-rich B2 phase, and the interdendrite exhibited a spinodal decomposed structure comprising an (Fe,Cr)-rich BCC phase and a (Ni,Al,Ti)-rich B2 phase. Age hardening and softening occurred at 500 °C to 800 °C and 900 °C to 1100 °C, respectively. We observed optimal age hardening at 700 °C, and alloy hardness increased to HV556. The hardening was attributed to the precipitation of the σ phase, and the softening was attributed to the dissolution of the σ phase back into the matrix and coarsening of the microstructure. The appearance of fine Widmanstätten precipitates formed by the (Al,Ti)-rich BCC phase and (Ni,Al,Ti)-rich B2 phase at 1200 °C led to secondary hardening. Full article
(This article belongs to the Special Issue High-Entropy Phases and Composites Based on Them: Manufacturing, Properties, Applications)
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