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Metals
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High-Entropy Alloys: Processing and Properties
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High-Entropy Alloys: Processing and Properties

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

Deadline for manuscript submissions: 30 September 2025 | Viewed by 494

Special Issue Editors

Dr. Xuejiao Wang

E-Mail Website
Guest Editor
School of Materials Science and Engineering , Taiyuan University of Technology, Taiyuan 030024, China
Interests: high entropy alloys; irradiation; nuclear materials
Dr. Zhong Wang

E-Mail Website
Guest Editor
School of Aeronautics and Astronautics, Taiyuan University of Technology, Taiyuan 030024, China
Interests: high-entropy alloys; amorphous alloy; impact dynamics; mechanical properties

Special Issue Information

Dear Colleagues,

Since the concept of high-entropy alloys were raised in 2004, entropic alloys and meta-metals have drawn worldwide attention for their vast advantages, including the adjustable elemental composition and crystal structure, good mechanical properties at high or low temperatures, high resistance under corrosion, oxidation, or irradiation environments, etc. At the early research stage, research regarding entropic alloys and meta-metals is mainly focused on the development of high-entropy alloy systems and the exploration on their basic properties, such as the crystal structure, mechanical properties, magnetic properties, and so on. Following this, the elemental and phase compositions are elaborately adjusted for further property improvement, and the mechanisms behind those advanced properties are revealed. Nowadays, based on the above, many methods of entropy alloy design and prediction have been raised and attempts have been made to extend entropic alloys and meta-metals to more scenarios, such as power plant and aircraft engines, nuclear power, sewage treatment, etc.

In this Special Issue, we welcome articles of entropic alloys and meta-metals that focus on elemental and alloy design, in-depth research on the mechanisms of these special alloys, development and optimization aimed at potential industrial applications, and discussions on the practical issues and possible answers regarding large-scale samples, such as phase stability under different environments, segregation, molding, and so on.

Dr. Xuejiao Wang
Dr. Zhong Wang
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. Metals 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
  • multi-principal element alloys
  • alloy design
  • phase design
  • segregation
  • industrial application
  • special alloys

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Published Papers (2 papers)

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17 pages, 12649 KiB  
Article
Microstructure, Mechanical Properties, and Electrochemical Corrosion Behavior of CoCrFeNiNb and CoCrFeNiV High-Entropy Alloys Prepared via Mechanical Alloying and Spark Plasma Sintering
by Yan Zhu, Yiwen Liu, Zhaocang Meng and Jianke Tian
Metals 2025, 15(7), 814; https://doi.org/10.3390/met15070814 - 21 Jul 2025
Viewed by 58
Abstract
This study investigates the microstructural evolution, mechanical behavior, and electrochemical performance of CoCrFeNiNb and CoCrFeNiV HEAs fabricated via mechanical alloying and spark plasma sintering. Microstructural analyses reveal that the alloys have a face-centered cubic (FCC) matrix with Nb-enriched Laves and V-enriched σ phases. [...] Read more.
This study investigates the microstructural evolution, mechanical behavior, and electrochemical performance of CoCrFeNiNb and CoCrFeNiV HEAs fabricated via mechanical alloying and spark plasma sintering. Microstructural analyses reveal that the alloys have a face-centered cubic (FCC) matrix with Nb-enriched Laves and V-enriched σ phases. The CoCrFeNiNb HEA exhibits superior compressive strength and hardness than CoCrFeNiV due to uniform Laves phases distribution. Fracture surface analysis reveals that at lower sintering temperatures, the fracture is primarily caused by incomplete particle bonding, whereas at higher temperatures, brittle fracture modes dominated via transgranular cracking become predominant. The research results of potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) show that both alloys exhibited superior electrochemical stability in a 3.5 wt.% NaCl solution compared to the CoCrFeNi base alloy. X-ray photoelectron spectroscopy (XPS) analysis confirms the formation of stable oxide layers (Nb2O5 and V2O3) on the precipitated phases, acting as protective barriers against chloride ion penetration. The selective oxidation of Nb and V improves the integrity of the passive film, reducing the corrosion rates and enhancing the long-term durability. These findings highlight the critical role of precipitated phases in enhancing the corrosion resistance of HEAs, and emphasize their potential for use in extreme environments. Full article
(This article belongs to the Special Issue High-Entropy Alloys: Processing and Properties)
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14 pages, 5112 KiB  
Article
Effect of Si Doping on Microstructure and Mechanical and Electrochemical Properties of (AlCrFeNi)100-xSix (x = 2, 4, 6) Dual-Phase Eutectic High-Entropy Alloys
by Subo Yu, Kaiwen Kang, Borui Zhang, Aoxiang Li and Gong Li
Metals 2025, 15(7), 762; https://doi.org/10.3390/met15070762 - 6 Jul 2025
Viewed by 243
Abstract
The effects of silicon (Si) doping on the microstructure, mechanical properties, and electrochemical corrosion behavior of dual-phase eutectic high-entropy alloys (AlCrFeNi)100-xSix (x = 2, 4, 6 at.%) were systematically investigated. The results reveal that with increasing Si content, all three [...] Read more.
The effects of silicon (Si) doping on the microstructure, mechanical properties, and electrochemical corrosion behavior of dual-phase eutectic high-entropy alloys (AlCrFeNi)100-xSix (x = 2, 4, 6 at.%) were systematically investigated. The results reveal that with increasing Si content, all three alloys maintain a sunflower-like eutectic microstructure composed of A2 and B2 phases, characterized by an expanding central region and a densification and refinement of the lamellar two-phase structure in the petal regions; the volume of phase B2 gradually increases, accompanied by the precipitation of nanoscale B2 particles. The test results of mechanical properties show that Si doping enhances the compressive strength and Vickers hardness but significantly reduces ductility, exhibiting a typical inverse strength–ductility relationship. Electrochemical corrosion tests demonstrate that higher Si content deteriorates corrosion resistance, with corrosion predominantly occurring in the B2 phase. Among the studied alloys, the Si2 variant exhibits the most balanced overall performance. This work provides valuable insights into the role of Si in tuning the microstructure and properties of eutectic high-entropy alloys and methodology for their compositional design and engineering applications. Full article
(This article belongs to the Special Issue High-Entropy Alloys: Processing and Properties)
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