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Metals
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Preparation, Properties, Microstructure and Applications of High Entropy Alloys
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Preparation, Properties, Microstructure and Applications of High Entropy Alloys

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

Deadline for manuscript submissions: 25 August 2025 | Viewed by 999

Special Issue Editors

Dr. Yongsheng Ren

E-Mail Website
Guest Editor
Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
Interests: high-entropy alloys; recycling of silicon waste; high performance Al alloys; silicon carbide
Dr. Ye Wang

E-Mail Website
Guest Editor
College of Chemical Engineering, Sichuan University, No.24 South Section 1, Yihuan Road, Chengdu 610065, China
Interests: high-entropy alloys; Ti alloy

Special Issue Information

Dear Colleagues,

✓ Metallic materials play an important role in industrial production and scientific research and are indispensable for everything from daily necessities to ships and aerospace engines. The limited properties of conventional materials are no longer sufficient to satisfy the demands of increasingly evolving processes. Material innovation is the core element in the field of metallic materials. The emergence of high-entropy alloys provides a new strategy for alloy composition design, which brings great development space to the field of materials. As compared with traditional alloys, this “rising star” in the world of alloy materials has uncommon microstructures and numerous appealing properties, such as great strength, great hardness, rich resistance to corrosion, fracture and fatigue resistance, high-temperature stability, and so on, that outperform conventional alloys. These superior properties of enriched HEAs are extremely interesting for research purposes and various promising potential applications. In addition, the preparation technology of high entropy alloys is becoming more abundant, and the high entropy alloys with different processes have shown remarkable achievements. In a short period of more than a decade, the concept of high-entropy alloys has been extended to high-entropy ceramics, high-entropy thin films, high-entropy steels, high-entropy high-temperature alloys, high-entropy cemented carbides and so on.

✓ In this Special Issue, we welcome articles that focus on the preparation methods of high-entropy alloys and their microstructure modulation and the influence of post-treatment processes on the properties of the final products. High-entropy alloy materials with excellent overall properties especially remain of interest, with high potential for implementation in the current harsh working environments, showing excellent service characteristics.

✓ Suggested themes and article types for submissions

In this Special Issue, original research articles and reviews are welcome. Research areas may include (but are not limited to) the following:

High entropy alloys; Microstructure; Alloy; Strength; Cryogenic properties; Corrosion resistance; Trade-off; Radiation resistance; Heat treatment

We look forward to receiving your contributions.

Dr. Yongsheng Ren
Dr. Ye 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
  • multicomponent
  • fabrication
  • synthesis techniques
  • microstructural characterization
  • properties
  • applications
  • future prospects

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Published Papers (2 papers)

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21 pages, 8084 KiB  
Article
Microstructural and Mechanical Characterization of Co-Free AlxTixCrFe2Ni High-Entropy Alloys
by Róbert Kočiško, Ondrej Milkovič, Patrik Petroušek, Gabriel Sučik, Dávid Csík, Karel Saksl, Ivan Petryshynets, Karol Kovaľ and Pavel Diko
Metals 2025, 15(8), 896; https://doi.org/10.3390/met15080896 - 10 Aug 2025
Viewed by 257
Abstract
This study investigates the effect of Alx and Tix content (x = 0.1, 0.2, 0.3, 0.4, 0.5, and 0.6) on the microstructural evolution and mechanical properties of Co-free high-entropy AlxTixCrFe2Ni alloys in both as-cast and [...] Read more.
This study investigates the effect of Alx and Tix content (x = 0.1, 0.2, 0.3, 0.4, 0.5, and 0.6) on the microstructural evolution and mechanical properties of Co-free high-entropy AlxTixCrFe2Ni alloys in both as-cast and homogenized conditions. The research focused on the characterization of structural features, melting behavior, and mechanical performance. Microstructural characterization was carried out using optical microscopy, scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), X-ray diffraction (XRD), and differential thermal analysis (DTA). Mechanical properties were evaluated through Vickers hardness testing and uniaxial compression tests. Increasing the Al and Ti content induced a transformation from a single-phase FCC structure to a dual-phase BCC structure, with the primary BCC phase strengthened by spherical precipitates rich in Al, Ti, and Ni. Homogenization annealing at 1100 °C led to an overall improvement in the mechanical properties. The Al0.3Ti0.3CrFe2Ni alloy exhibited the most balanced combination of strength and ductility after annealing, achieving a compressive yield strength of 1510 MPa, a compressive strength of 3316 MPa, and a compressive plastic strain of 45%. Full article
(This article belongs to the Special Issue Preparation, Properties, Microstructure and Applications of High Entropy Alloys)
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25 pages, 5297 KiB  
Article
Composition Design and Property Prediction for AlCoCrCuFeNi High-Entropy Alloy Based on Machine Learning
by Cuixia Liu, Meng Meng and Xian Luo
Metals 2025, 15(7), 733; https://doi.org/10.3390/met15070733 - 30 Jun 2025
Viewed by 309
Abstract
Based on the innovative mode driven by “data + artificial intelligence”, in this study, three methods, namely Gaussian noise (GAUSS Noise), the Generative Adversarial Network (GAN), and the optimized Generative Adversarial Network (GANPro), are adopted to expand and enhance the collected dataset of [...] Read more.
Based on the innovative mode driven by “data + artificial intelligence”, in this study, three methods, namely Gaussian noise (GAUSS Noise), the Generative Adversarial Network (GAN), and the optimized Generative Adversarial Network (GANPro), are adopted to expand and enhance the collected dataset of element contents and the hardness of the AlCoCrCuFeNi high-entropy alloy. Bayesian optimization with grid search is used to determine the optimal combination of hyperparameters, and two interpretability methods, SHAP and permutation importance, are employed to further explore the relationship between the element features of high-entropy alloys and hardness. The results show that the optimal data augmentation method is Gaussian noise enhancement; its accuracy reaches 97.4% under the addition of medium noise (σ = 0.003), and an optimal performance prediction model based on the existing dataset is finally constructed. Through the interpretability method, it is found that the contributions of Al and Ni are the most prominent. When the Al content exceeds 0.18 mol, it has a positive promoting effect on hardness, while Ni and Cu exhibit a critical effect of promotion–inhibition near 0.175 mol and 0.14 mol, respectively, revealing the nonlinear regulation law of element contents. This study solves the problem of revealing the mutual relationship between the element contents and hardness of high-entropy alloys in the case of a lack of alloy data and provides theoretical guidance for further improving the performance of high-entropy alloys. Full article
(This article belongs to the Special Issue Preparation, Properties, Microstructure and Applications of High Entropy Alloys)
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