High-Entropy Alloy and Films: Design, Properties and Application

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Entropic Alloys and Meta-Metals".

Deadline for manuscript submissions: closed (20 June 2025) | Viewed by 626

Special Issue Editors


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Guest Editor
Key Laboratory of Advanced Technologies of Materials, Ministry of Education, College of Medicine, Southwest Jiaotong University, Chengdu 610031, China
Interests: titanium oxide; thin films; mechanical properties; biocompatibility; artificial joints; intravascular stent

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Guest Editor
Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
Interests: high entropy alloy; protective coating; material wear and corrosion; physical vapor deposition

Special Issue Information

Dear Colleagues,

High-entropy alloys (HEAs) represent a revolutionary class of materials, characterized by a complex mix of multiple principal elements in near-equiatomic ratios. This unique composition leads to a high configurational entropy, which imparts a remarkable combination of properties not found in conventional alloys. HEAs have demonstrated exceptional mechanical strength, outstanding wear resistance, and superior thermal stability, making them highly attractive for a wide range of advanced applications, including aerospace, automotive, and energy sectors.

This Special Issue is dedicated to the latest research and developments in the design, properties, and applications of high-entropy alloys and films. We invite contributions that explore innovative alloy compositions, novel fabrication techniques, and comprehensive characterization of microstructures and properties. Both theoretical and experimental studies are welcome, covering aspects such as alloy synthesis, advanced experimental characterization, computational modeling, and practical engineering applications.

In particular, the study of high-entropy alloy films opens new avenues for applications in protective coatings, electronics, and catalysis. We encourage submissions that delve into the deposition methods, microstructural evolution, and functional properties of HEA films. Understanding the interplay between processing conditions, microstructure, and resultant properties is crucial for advancing the field.

We call upon researchers worldwide to submit their original research and review articles on HEAs and HEA films. Areas of interest include, but are not limited to, mechanical and thermal properties, corrosion resistance, magnetic properties, and novel applications across various industries. Your contributions will be pivotal in advancing our understanding and utilization of high-entropy materials, driving forward innovations in this exciting and rapidly evolving field.

Prof. Dr. Yongxiang Leng
Dr. Xin Jiang
Guest Editors

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Keywords

  • high-entropy alloys (HEAs)
  • multi-principal element alloys
  • thin films
  • coatings
  • microstructural characterization
  • mechanical properties
  • thermal stability
  • corrosion resistance
  • deposition techniques
  • design and modeling

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Published Papers (1 paper)

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Research

13 pages, 9140 KiB  
Article
Effect of Heat Treatment on Corrosion of an AlCoCrFeNi2.1 Eutectic High-Entropy Alloy in 3.5 wt% NaCl Solution
by Jun Jiang, Haijing Sun and Jie Sun
Metals 2025, 15(6), 681; https://doi.org/10.3390/met15060681 - 19 Jun 2025
Viewed by 242
Abstract
This paper studies how heat treatments influence the corrosion of an AlCoCrFeNi2.1 eutectic high-entropy alloy (EHEA) in a 3.5 wt% NaCl solution, by comparing the corrosion behaviors of as-cast, 600 °C heat-treated, and 1000 °C heat-treated samples using microstructure characterization, electrochemical measurements, [...] Read more.
This paper studies how heat treatments influence the corrosion of an AlCoCrFeNi2.1 eutectic high-entropy alloy (EHEA) in a 3.5 wt% NaCl solution, by comparing the corrosion behaviors of as-cast, 600 °C heat-treated, and 1000 °C heat-treated samples using microstructure characterization, electrochemical measurements, and surface characterization. The electrochemical results show that the pitting potential rises and the passive current density and passive film resistance are almost changeless with an increasing heat treatment temperature. The enhancement in the pitting corrosion resistance results from the increased amount of the Cr-rich FCC phase and decreased amount of the B2 phase rich in the Al element, which are induced by the heat treatment. On one hand, this microstructure evolution can make the passive film have more Cr2O3 and less Al2O3, thereby enhancing its protective properties, as confirmed by the X-ray photoelectron spectroscopy analysis. On the other hand, the decreased amount of the Al-rich B2 phase can make the pitting corrosion less prone to initiate since the B2 phase can act as the pit initiation site, which is supported by the observation of corrosion morphologies, due to its higher electrochemical activity. In a summary, the heat treatment is beneficial for improving the pitting corrosion resistance of the AlCoCrFeNi2.1 EHEA. Full article
(This article belongs to the Special Issue High-Entropy Alloy and Films: Design, Properties and Application)
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