High-Entropy Alloys

A special issue of Alloys (ISSN 2674-063X).

Deadline for manuscript submissions: 31 December 2025 | Viewed by 4154

Special Issue Editors


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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

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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.

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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

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Keywords

  • high-entropy alloys
  • microstructure
  • deformation
  • corrosion
  • wear

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Published Papers (1 paper)

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Research

11 pages, 2869 KiB  
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
Viewed by 2884
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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