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Alloys
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High-Entropy Alloys
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High-Entropy Alloys

A Special Issue of Alloys (ISSN 2674-063X).

Deadline for manuscript submissions: 31 December 2026 | Viewed by 12416

Editors

Prof. Dr. Peter Hodgson

E-Mail Website
Guest Editor
Institute for Technology Research and Innovation, Deakin University, Melbourne, VIC, Australia
Interests: steel processing; development of new alloys; downstream ferrous and non-ferrous manufacturing processes associated with the automotive industry
Prof. Dr. Daniel Fabijanic

E-Mail Website
Guest Editor
Institute for Frontier Materials, Deakin University, Geelong, Melbourne, VIC, Australia
Interests: surface engineering of light metals; coating of powders and fibres; recycling of materials.
Dr. Jithin Joseph

E-Mail Website
Guest Editor
Institute for Frontier Materials, Deakin University, Geelong, Melbourne, VIC, Australia
Interests: additive manufacturing; friction materials for automotive brakes; high entropy alloys; mechanical behavior of engineering alloys/dislocation analysis; microstructural analysis; surface coatings (CVD, PVD, hot dipping); heat treatment/thermomechanical processing; wear testing; tribological properties; casting/vacuum arc-melting; solidification

Special Issue Information

Dear Colleagues,

High-entropy alloys are a relatively new class of alloy, which do not possess one principle element as the basis for the alloy; instead, they have highly complex chemistries and often contain more than five elements in large percentages. These complex chemistries have revealed a range of new and very exciting properties in high-entropy alloys, making them of interest in a range of different applications. For example, some high-entropy alloys have extremely good high-temperature properties, behaving almost like a refractory. Others have been shown to have excellent corrosion properties. Wear is also an area in which high-entropy alloys are receiving a lot of research interest, with their properties exceeding comparable alloy microstructures. The cryogenic properties of high-entropy alloys have also been found to be exceptional. Since high-entropy alloy development is still relatively new, there is also really exciting fundamental work to be carried out in this field, for example: the effect of chemical segregation on the properties; the atomic scale arrangement in these chemically complex alloys, the kinetics of phase transformations, the diffusivity of different species in these complex crystal structures, and how dislocations move through such a complex local environment, just to name a few. So, it can be seen that, both experimentally and computationally, there is a lot of interesting and important work being carried out in the field of high-entropy alloy development. We have therefore dedicated this Special Issue to high-entropy alloys and welcome the submission of papers on this new alloy class. Papers focusing on alloy chemistry, experimental measurement of properties, theoretical calculations, and advanced characterization of high-entropy alloys are all welcome.

Prof. Dr. Peter Hodgson
Prof. Dr. Daniel Fabijanic
Dr. Jithin Joseph
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 250 words) can be sent to the Editorial Office for assessment.

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-anonymized peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Alloys is an international peer-reviewed open access quarterly 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 1200 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 alloys
  • microstructure
  • deformation
  • corrosion
  • wear

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Published Papers (3 papers)

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Research

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32 pages, 10072 KB  
Article
Evolution of Microstructural Features and Electrochemical Corrosion Assessment of Ga-Doped CoCrFeNi High-Entropy Alloys: A Comparative Study
by Emmanuel Georgatis, Anthoula Poulia, Stavros Kiape, Aikaterini Lefa, Christina Prosili, Margarita Ziavra, Theodore E. Matikas and Alexander E. Karantzalis
Alloys 2026, 5(2), 12; https://doi.org/10.3390/alloys5020012 - 30 May 2026
Viewed by 573
Abstract
This study investigates the microstructural evolution of the CoCrFeNi system after incorporating Gallium (Ga) at varying concentrations (0, 15, and 20 at.%). The systems were synthesized by Vacuum Arc Melting (VAM) and characterized through X-ray Diffraction diffraction (XRD) and Scanning Electron Microscopy (SEM/EDS). [...] Read more.
This study investigates the microstructural evolution of the CoCrFeNi system after incorporating Gallium (Ga) at varying concentrations (0, 15, and 20 at.%). The systems were synthesized by Vacuum Arc Melting (VAM) and characterized through X-ray Diffraction diffraction (XRD) and Scanning Electron Microscopy (SEM/EDS). Findings showed that the CoCrFeNi medium medium-entropy alloy stabilizes in a single-phase Face-Centered Cubic (FCC) structure. Upon the addition of 15 at.% Ga a dendritic morphology with a transition towards a duplex FCC + BCC microstructure was induced, a trend which was further solified in the equiatomic FeCoNiCrGa system. In this case the proportion of the Ga-rich BCC phase was increased from 18–22% to 31–34% for the Ga15 and Ga20 systems respectively. A combined approach of Electrochemical Frequency Modulation (EFM), Cyclic Potentiodynamic Polarization (CPP), and Electrochemical Impedance Spectroscopy (EIS) was selected for studying the electrochemical corrosion behavior of the produced systems. EFM results indicated a progressive deterioration of corrosion resistance when increasing Ga concentration (Icorr: 4.142, 5.619 and 10.01 μA/cm2, and Rp: 12,035, 10,736 and 7254 Ω for the Ga0, Ga15 and Ga20 alloys respectively). Surface inhomogeneity, rapid passivation, and diffusion-controlled processes caused deviations from the ideal causality factors’ values. CPP measurements revealed increasing corrosion current densities with Ga addition within the Tafel region (2.81 × 10−7, 3.72 × 10−7 and 5.11 × 10−7A/cm2 for the Ga0, Ga15 and Ga20 alloys respectively). All alloys showed positive hysteresis loops and an absence of repassivation, indicating susceptibility to pitting corrosion. Nevertheless, detailed analysis of the forward polarization region highlighted a more complex aspect. Reverse polarization scans confirmed stable pit growth in all alloys, with the absence of a repassivation tendency. EIS tests, performed after the completion of CPP measurements, further clarified the corrosion mechanisms. Equivalent circuit modeling revealed that although Ga-containing alloys exhibited relatively improved film characteristics in the forward polarization stage, the charge transfer resistance (Rct) was highest for the CoCrFeNi alloy, followed by Ga15 and Ga20 (22,620, 11,380, 10,060 Ω respectively). The overall impedance ranking (Ga0 > Ga15 > Ga20, i.e., 27,139 > 20,279.5 > 16,341 ohms respectively) showed that, despite microstructural and entropic effects enhancing certain passivation aspects, the reduced Cr content highly impacted long-term corrosion resistance. This holistic electrochemical approach showcases the complex interactions between compositional alterations, phase structure, grain refinement, passive film chemistry, and diffusion trends in establishing the corrosion performance of Ga-modified CoCrFeNi HEAs. Full article
(This article belongs to the Special Issue High-Entropy Alloys)
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11 pages, 2869 KB  
Article
Powder Metallurgy Processing and Characterization of the χ Phase Containing Multicomponent Al-Cr-Fe-Mn-Mo Alloy
by Tomasz Stasiak, Mourtada Aly Sow, Matthieu Touzin, Franck Béclin and Catherine Cordier
Alloys 2023, 2(1), 44-54; https://doi.org/10.3390/alloys2010003 - 13 Feb 2023
Cited by 1 | Viewed by 5205
Abstract
High entropy alloys present many promising properties, such as high hardness or thermal stability, and can be candidates for many applications. Powder metallurgy techniques enable the production of bulk alloys with fine microstructures. This study aimed to investigate powder metallurgy preparation, i.e., mechanical [...] Read more.
High entropy alloys present many promising properties, such as high hardness or thermal stability, and can be candidates for many applications. Powder metallurgy techniques enable the production of bulk alloys with fine microstructures. This study aimed to investigate powder metallurgy preparation, i.e., mechanical alloying and sintering, non-equiatomic high entropy alloy from the Al-Cr-Fe-Mn-Mo system. The structural and microstructural investigations were performed on powders and the bulk sample. The indentation was carried out on the bulk sample. The mechanically alloyed powder consists of two bcc phases, one of which is significantly predominant. The annealed powder and the sample sintered at 950 °C for 1 h consist of a predominantly bcc phase (71 ± 2 vol.%), an intermetallic χ phase (26 ± 2 vol.%), and a small volume fraction of multielement carbides—M6C and M23C6. The presence of carbides results from carbon contamination from the balls and vial during mechanical alloying and the graphite die during sintering. The density of the sintered sample is 6.71 g/cm3 (98.4% relative density). The alloy presents a very high hardness of 948 ± 34 HV1N and Young’s modulus of 245 ± 8 GPa. This study showed the possibility of preparing ultra-hard multicomponent material reinforced by the intermetallic χ phase. The research on this system presented new knowledge on phase formation in multicomponent systems. Moreover, strengthening the solid solution matrix via hard intermetallic phases could be interesting for many industrial applications. Full article
(This article belongs to the Special Issue High-Entropy Alloys)
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Review

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21 pages, 929 KB  
Review
Compositional Design of High-Entropy Alloys: Advances in Structural and Hydrogen Storage Materials
by Shaopeng Wu, Dongxin Wang, Nairan Wang, Xiaobo Ma, Zhongxiong Xu, Le Li, Mingda Han and Cheng Zhang
Alloys 2026, 5(1), 3; https://doi.org/10.3390/alloys5010003 - 7 Jan 2026
Cited by 8 | Viewed by 2763
Abstract
High-entropy alloys (HEAs) present a vast compositional design space, characterized by four core effects—high configurational entropy, sluggish diffusion, severe lattice distortion, and the cocktail effect—which collectively underpin their exceptional potential for both structural and hydrogen storage applications. This mini-review synthesizes recent advances in [...] Read more.
High-entropy alloys (HEAs) present a vast compositional design space, characterized by four core effects—high configurational entropy, sluggish diffusion, severe lattice distortion, and the cocktail effect—which collectively underpin their exceptional potential for both structural and hydrogen storage applications. This mini-review synthesizes recent advances in the compositional design of HEAs with emphasis on structural materials and hydrogen storage. Firstly, it provides an overview of the definition of HEAs and the roles of principal alloying elements, then synthesizes solid solution formation rules based on representative descriptors—atomic size mismatch, electronegativity difference, valence electron concentration, mixing enthalpy, and mixing entropy—together with their applicability limits and common failure scenarios. A brief introduction is provided to the preparation methods of arc melting and powder metallurgy, which have a strong interaction with the composition. The design–structure–property links are then consolidated for structural materials (mechanical properties) and for hydrogen storage materials (hydrogen storage performance). Furthermore, the rules for the combined design of control systems for HEAs and the associated challenges were further discussed, and the future development prospects of HEAs in structural materials and hydrogen storage were also envisioned. Full article
(This article belongs to the Special Issue High-Entropy Alloys)
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