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Entropy
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Recent Advances in High Entropy Alloys
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Recent Advances in High Entropy Alloys

A special issue of Entropy (ISSN 1099-4300). This special issue belongs to the section "Multidisciplinary Applications".

Deadline for manuscript submissions: 31 August 2025 | Viewed by 3864

Special Issue Editors

Dr. Hui Xu

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
Interests: high-entropy alloys; amorphous alloys; magnetic properties; mechanical properties; microstructure; heterostructured materials
Dr. Zhong Li

E-Mail Website
Guest Editor
College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
Interests: high-entropy alloys; magnetic properties; mechanical properties; electrocatalysis; hybrid nanostructures

Special Issue Information

Dear Colleagues,

This Special Issue on "Recent Advances in High Entropy Alloys" aims to explore cutting-edge developments in the field of materials science, focusing on the unique properties and applications of high-entropy alloys (HEAs). These alloys, characterized by their equiatomic or near-equiatomic mixture of four or more elements, have garnered significant attention due to their remarkable mechanical strength, corrosion resistance, and other exceptional properties, which are not typically observed in conventional alloys.

This issue seeks to provide a comprehensive platform for researchers, engineers, and academics to share their latest findings, innovative theories, and experimental results related to HEAs. The scope of this issue encompasses the synthesis methods, microstructure characterization, magnetic, properties, mechanical properties, phase stability, and potential applications of high-entropy alloys in various industries, including aerospace, biomedical, and energy sectors.

We welcome submissions that delve into the fundamental understanding of HEAs, computational studies predicting new alloy systems, and experimental investigations of their properties. Additionally, we are interested in articles that discuss the role of high-entropy alloys in multidisciplinary research, such as their use in catalytic processes, sensors, and environmental protection technologies.

The Special Issue will follow a rigorous peer-review process to ensure the quality and significance of the published work. We encourage authors to submit their manuscripts that contribute to the advancement of knowledge in high-entropy alloys and their practical implementations, fostering innovation and technological breakthroughs in material science.

Dr. Hui Xu
Dr. Zhong Li
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. Entropy 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 alloys/materials
  • medium-entropy alloy/materials
  • alloy design
  • synthesis methods
  • magnetic properties
  • mechanical properties
  • electrocatalysis
  • irradiation
  • microstructure
  • modeling and simulation

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Published Papers (3 papers)

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Research

15 pages, 9877 KiB  
Article
Tuning Corrosion Resistance and AC Soft Magnetic Properties of Fe-Co-Ni-Al Medium-Entropy Alloy via Ni Content
by Wenfeng Peng, Yubing Xia, Hui Xu and Xiaohua Tan
Entropy 2024, 26(12), 1038; https://doi.org/10.3390/e26121038 - 30 Nov 2024
Viewed by 1144
Abstract
Corrosion of soft magnetic materials during service can significantly impact their performance and service life, therefore it is important to improve their corrosion resistance. In this paper, the corrosion resistance, alternating current soft magnetic properties (AC SMPs) and microstructure of FeCoNixAl [...] Read more.
Corrosion of soft magnetic materials during service can significantly impact their performance and service life, therefore it is important to improve their corrosion resistance. In this paper, the corrosion resistance, alternating current soft magnetic properties (AC SMPs) and microstructure of FeCoNixAl (x = 1.0–2.0) medium-entropy alloys (MEAs) were studied. Corrosion resistance is greatly improved with an increase in Ni content. The x = 2.0 alloy has the lowest corrosion current density (Icorr = 2.67 × 10−7 A/cm2), which is reduced by 71% compared to the x = 1.0 alloy. Increasing the Ni content can improve the AC SMPs of the alloy. When x = 1.75, the total loss (Ps) is improved by 6% compared to the x = 1.0 alloy. X-ray diffraction (XRD) and scanning electron microscopy (SEM) show that the increase in Ni content is beneficial for promoting the formation of the face-centered-cubic (FCC) phase, and the body-centered-cubic (BCC) phase is gradually divided by the FCC phase. Electron backscatter diffraction (EBSD) shows that, with the increase in Ni content, the number of grain boundaries in the alloy is greatly reduced and numerous phase boundaries appear in the alloys. The degree of strain concentration is significantly reduced with the increasing Ni content. The corrosion mechanism of alloys is also discussed in this paper. Our study provides a method to balance the soft magnetic properties and corrosion resistance, paving the way for potential applications of Fe-Co-Ni-Al MEAs in corrosive environments. Full article
(This article belongs to the Special Issue Recent Advances in High Entropy Alloys)
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21 pages, 42043 KiB  
Article
Study on the Microstructure, Mechanical Properties, and Corrosion Behavior of 900 °C-Annealed CoCrFeMnNiSix (X = 0, 0.3, 0.6, 0.9) High-Entropy Alloys
by Chunxia Jiang, Rongbin Li, Zaikang Zong, Wenge Li, Yong Zhang and Tongyao Li
Entropy 2024, 26(11), 897; https://doi.org/10.3390/e26110897 - 23 Oct 2024
Viewed by 972
Abstract
In this study, a series of CoCrFeMnNiSix (x = 0, 0.3, 0.6, 0.9) high-entropy alloys (HEAs) were prepared by suspension melting of cold crucible, annealed at 1000 °C, and then quenched at 900 °C. The changes in the microstructure of the HEAs after [...] Read more.
In this study, a series of CoCrFeMnNiSix (x = 0, 0.3, 0.6, 0.9) high-entropy alloys (HEAs) were prepared by suspension melting of cold crucible, annealed at 1000 °C, and then quenched at 900 °C. The changes in the microstructure of the HEAs after the addition of Si were analyzed using X-ray diffraction (XRD), metallographic microscope, scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), and electron backscatter diffraction (EBSD). The hardness, room-temperature friction, and wear behavior, room-temperature compressive properties, and corrosion resistance of the annealed CoCrFeMnNiSix HEAs were also studied. The results show that when the Si content is 0 and 0.3, the annealed CoCrFeMnNiSix HEA exhibits a single face-centered cubic (FCC) structure. As the silicon content increases, a face-centered orthorhombic (FCO) phase appears. At a Si content of 0.9, a hexagonal close-packed (HCP) phase is observed. After heat treatment, the hardness of the CoCrFeMnNiSix HEAs increases continuously with the addition of Si. The HEA with a Si content of 0.9 achieves the highest hardness of 974.8 ± 30.2 HV. The HEA with a Si content of 0.6 reaches the highest compressive strength and yield strength, which are 1990.3 MPa and 1327.5 MPa. When the Si content is 0.9, the HEA shows the smoothest surface after wear, with the best wear resistance, achieving a value of 0.21 mm−1. In the CoCrFeMnNiSix HEAs after 900 °C heat treatment, the HEA with a Si content of 0.6 exhibits the lowest self-corrosion current density of 0.23 µA/cm2 and the highest pitting potential of 157.65 mV, indicating the best corrosion resistance. Full article
(This article belongs to the Special Issue Recent Advances in High Entropy Alloys)
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15 pages, 8452 KiB  
Article
Cooling Rate and Compositional Effects on Microstructural Evolution and Mechanical Properties of (CoCrCuTi)100−xFex High-Entropy Alloys
by Brittney Terry and Reza Abbaschian
Entropy 2024, 26(10), 826; https://doi.org/10.3390/e26100826 - 29 Sep 2024
Viewed by 1022
Abstract
This study investigates the impact of cooling rate and alloy composition on phase formations and properties of (CoCrCuTi)100−xFex (x = 0, 5, 10, 12.5, 15) high-entropy alloys (HEAs). Samples were synthesized using arc-melting and electromagnetic levitation, followed by quenching through [...] Read more.
This study investigates the impact of cooling rate and alloy composition on phase formations and properties of (CoCrCuTi)100−xFex (x = 0, 5, 10, 12.5, 15) high-entropy alloys (HEAs). Samples were synthesized using arc-melting and electromagnetic levitation, followed by quenching through the use of a Cu chill or V-shaped Cu mold. Cooling rates were evaluated by measuring dendrite arm spacings (DASs), employing the relation DAS = k ɛ−n, where constants k = 16 and n = ½. Without Fe addition, a microstructure consisting of BCC1 + BCC2 phases formed, along with an interdendritic (ID) FCC Cu-rich phase. However, with the addition of 5–10% Fe, a Cu-lean C14 Laves phase emerged, accompanied by a Cu-rich ID FCC phase. For cooling rates below 75 K/s, alloys containing 10% Fe exhibited liquid phase separation (LPS), characterized by globular Cu-rich structures within the Cu-lean liquid. In contrast, for the same composition, higher cooling rates of 400–700 K/s promoted a dendritic/interdendritic microstructure. Alloys with 12.5–15 at. % Fe displayed LPS irrespective of the cooling rate, although an increase in uniformity was noted at rates exceeding 700 K/s. Vickers hardness and fracture toughness generally increased with Fe content, with hardness ranging from 444 to 891 HV. The highest fracture toughness (5.5 ± 0.4 KIC) and hardness (891 ± 66 HV) were achieved in samples containing 15 at. % Fe, cooled at rates of 25–75 K/s. Full article
(This article belongs to the Special Issue Recent Advances in High Entropy Alloys)
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