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Special Issue "Surface Treatment for High-Entropy Alloys"

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

Deadline for manuscript submissions: closed (20 February 2023) | Viewed by 2184

Special Issue Editors

Chair of Materials and Surface Engineering, Chemnitz University of Technology, Chemnitz, Germany
Interests: thermal spraying; laser cladding; wear; corrosion
Special Issues, Collections and Topics in MDPI journals
1. Division of Microstructure Physics, Department of Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
2. Material Science and Engineering, Gebze Technical University, 41400 Gebze, Kocaeli, Turkey
Interests: aluminum alloys; nickel alloy; high entropy alloys; atom probe tomography; coatings; biomaterials; boronizing; powder metallurgy; metal matrix composites; plasma electrolyte oxidation; tribology

Special Issue Information

Dear Colleagues,

Recently, high-entropy alloys (HEAs) have aroused growing interest in the scientific community. HEAs contain multiple basic alloying elements and have a wide composition range, which is attractive for the design of new alloys. HEAs are defined as alloys with five or more metallic elements, each of which has an atomic percentage between 5% and 35%. HEAs have unique compositions and microstructures, and they exhibit attractive properties including high strength, high-temperature strength and good structural stability for high-temperature applications. Yet, although the bulk properties of some HEAs are good, their surface properties may be insufficient. Surface properties are very important for a wide variety of advanced industrial applications, especially in areas where surface performance is important, such as tribology-, corrosion-, and oxidation-resistance properties. Thus, the focus has recently turned to the surface properties of HEAs. Within this context, we would like to invite you to submit your manuscript(s) to Materials for the Special Issue on Surface Treatment for High-Entropy Alloys. The scope of this Special Issue includes various traditional and advanced surface treatment methods applied to HEAs (thermo-chemical surface treatment methods, boronizing, nitriding, carburizing, aluminizing, siliciding, thermal spray, sputter deposition, micro-arc oxidation, laser surface melting, laser/plasma cladding, shot/sand blasting, friction stir welding). The aim of the Special Issue is to demonstrate the current research and the potential of these HEAs. Full papers, communications, and reviews are all welcome. We are looking forward to receiving your contributions.

Prof. Dr. Thomas Lampke
Dr. Sezgin Cengiz
Guest Editors

Manuscript Submission Information

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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.


  • high entropy alloy
  • surface treatment
  • surface modification
  • coating
  • surface properties

Published Papers (1 paper)

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The Effect of Hf Addition on the Boronizing and Siliciding Behavior of CoCrFeNi High Entropy Alloys
Materials 2022, 15(6), 2282; - 19 Mar 2022
Cited by 9 | Viewed by 1645
The effect of a boronizing and siliciding process on CoCrFeNiHf0.1–0.42 high entropy alloys was examined in this study. When increasing the amount of added Hf in CoCrFeNiHfx, the structure of the alloys gradually transformed from single-phase FCC to firstly Ni [...] Read more.
The effect of a boronizing and siliciding process on CoCrFeNiHf0.1–0.42 high entropy alloys was examined in this study. When increasing the amount of added Hf in CoCrFeNiHfx, the structure of the alloys gradually transformed from single-phase FCC to firstly Ni7Hf2 + FCC, and finally to C15 Laves and FCC phases. The boronizing/siliciding process resulted in the formation of a silicon-rich layer and a boride layer (BL). Increasing the amount of Hf in the alloys resulted in a decrease in the combined layer thickness, which was measured for CoCrFeNi, CoCrFeNiHf0.1, CoCrFeNiHf0.2, and CoCrFeNiHf0.42 to be 70 µm, 63 µm, 20 µm, and 15 µm, respectively. In contrast, the thickness of the transition zone/diffusion zone increased with more Hf in the alloys. While silicon atoms were gathered close to the BL, they were not transferred into the CoCrFeNi substrate. In contrast to the observation for CoCrFeNi, Si atoms penetrated through the Ni-rich phase (Ni7Hf2) in the CoCrFeNiHfx alloys. Furthermore, the Cr-B rich area (Cr5B3) in the coating limited the transport of Si into the CoCrFeNiHfx substrates. XRD analysis showed that the BL contained Ni2Si, FeB, Fe2B, Co2B, and Cr5B3 phases. Full article
(This article belongs to the Special Issue Surface Treatment for High-Entropy Alloys)
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