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Synthesis, Properties and Applications of High Entropy Alloy Thin Films...
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Synthesis, Properties and Applications of High Entropy Alloy Thin Films and Coatings

A special issue of Coatings (ISSN 2079-6412).

Deadline for manuscript submissions: closed (20 June 2021) | Viewed by 15887

Special Issue Editors

Dr. Robert Franz

E-Mail Website
Guest Editor
Department of Materials Science, Montanuniversität Leoben, Franz-Josef-Strasse 18, A-8700 Leoben, Austria
Interests: thin film; tribology; nitride and oxide coatings; cathodic arc; sputtering; high power impulse sputtering; thin films on compliant substrates; electromechanical behavior
Dr. Weibing Liao

E-Mail Website
Guest Editor
College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
Interests: high-entropy films; amorphous alloy films; pulsed laser deposition; magnetron sputtering; microstructures; mechanical properties

Special Issue Information

Dear Colleagues,

High entropy alloys (HEAs) have been introduced as a new class of materials in recent years. Thanks to their properties, they show potential for a wide range of future applications. While an extensive literature is already available for bulk HEAs, thin-film HEAs are still relatively unexplored. The aim of this Special Issue is to contribute to further advancing the understanding of thin-film HEAs by collecting experimental and theoretical works focused on the relations between synthesis, structure, properties, and applications of these films.

In particular, the topics of interest include, but are not limited to:

  • Metallic, nitride, oxide, or boride HEA thin films;
  • Influence of synthesis conditions on structure and properties;
  • Phase and thermal stability;
  • Potential applications.

Dr. Robert Franz
Dr. Weibing Liao
Guest Editors

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. Coatings 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.

Published Papers (3 papers)

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Research

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8 pages, 2028 KiB  
Article
Thermal Stability of MoNbTaVW High Entropy Alloy Thin Films
by Ao Xia and Robert Franz
Coatings 2020, 10(10), 941; https://doi.org/10.3390/coatings10100941 - 30 Sep 2020
Cited by 14 | Viewed by 3056
Abstract
Refractory high entropy alloys are an interesting material class because of their high thermal stability, decent electrical conductivity, and promising mechanical properties at elevated temperature. In the present work, we report on the thermal stability of body-centered cubic MoNbTaVW solid solution thin films [...] Read more.
Refractory high entropy alloys are an interesting material class because of their high thermal stability, decent electrical conductivity, and promising mechanical properties at elevated temperature. In the present work, we report on the thermal stability of body-centered cubic MoNbTaVW solid solution thin films that were synthesized by cathodic arc deposition. After vacuum annealing up to 1600 °C, the morphology, chemical composition, crystal structure, and electrical conductivity, as well as the mechanical properties, were analyzed. The observed body-centered cubic MoNbTaVW solid solution phase is stable up to 1500 °C. The evolution of electrical and mechanical properties due to the annealing treatment is discussed based on the observed structural changes of the synthesized thin films. Full article
(This article belongs to the Special Issue Synthesis, Properties and Applications of High Entropy Alloy Thin Films and Coatings)
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12 pages, 3574 KiB  
Article
Precipitation Hardening of the HVOF Sprayed Single-Phase High-Entropy Alloy CrFeCoNi
by Martin Löbel, Thomas Lindner, Ralph Hunger, Robin Berger and Thomas Lampke
Coatings 2020, 10(7), 701; https://doi.org/10.3390/coatings10070701 - 20 Jul 2020
Cited by 19 | Viewed by 2789
Abstract
The application of high-entropy alloys (HEA) in surface technology has great potential due to the high corrosion and wear resistance. A further improvement can be achieved by applying thermochemical treatments. Powder-pack boriding enables the formation of a protective precipitation layer. This process has [...] Read more.
The application of high-entropy alloys (HEA) in surface technology has great potential due to the high corrosion and wear resistance. A further improvement can be achieved by applying thermochemical treatments. Powder-pack boriding enables the formation of a protective precipitation layer. This process has already been applied for cast HEAs causing the formation of a diffusion-enriched surface layer and a distinct increase in wear resistance. In the current investigations, the alloy CrFeCoNi with a single-phase face-centred cubic (fcc) structure is considered. An efficient application can be achieved by limiting the material usage of HEAs to the surface. Therefore, the high-velocity-oxygen-fuel (HVOF) thermal spray process is applied. Boriding was conducted with an adapted powder-pack routine. Furthermore, borided bulk HEAs were considered as a reference. The influence of the production route and boriding treatment on the microstructure, phase formation, and properties was investigated in detail. For the coating and the cast HEA, a precipitation layer is formed. Hence, the hardness and wear resistance are significantly increased. The current study proves the suitability of the investigated process combination. Full article
(This article belongs to the Special Issue Synthesis, Properties and Applications of High Entropy Alloy Thin Films and Coatings)
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Review

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16 pages, 3217 KiB  
Review
High Entropy Alloy Coatings and Technology
by Ashutosh Sharma
Coatings 2021, 11(4), 372; https://doi.org/10.3390/coatings11040372 - 24 Mar 2021
Cited by 61 | Viewed by 9267
Abstract
Recently, the materials research community has seen a great increase in the development of multicomponent alloys, known as high entropy alloys (HEAs) with extraordinary properties and applications. In surface protection and engineering, diverse applications of HEAs are also being counted to benefit from [...] Read more.
Recently, the materials research community has seen a great increase in the development of multicomponent alloys, known as high entropy alloys (HEAs) with extraordinary properties and applications. In surface protection and engineering, diverse applications of HEAs are also being counted to benefit from their attractive performances in various environments. Thermally sprayed HEA coatings have outperformed conventional coating materials and have accelerated further advancement in this field. Therefore, this review article overviews the initial developments and outcomes in the field of HEA coatings. The authors have also categorized these HEA coatings in metallic, ceramic, and composite HEA coatings and discussed various developments in each of the categories in detail. Various fabrication strategies, properties, and important applications of these HEAs are highlighted. Further, various issues and future possibilities in this area for coatings development are recommended. Full article
(This article belongs to the Special Issue Synthesis, Properties and Applications of High Entropy Alloy Thin Films and Coatings)
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