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Fabrication, Characterization, and Application of High Entropy Alloy
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Fabrication, Characterization, and Application of High Entropy Alloy

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Metals and Alloys".

Deadline for manuscript submissions: 30 June 2025 | Viewed by 1110

Special Issue Editors

Dr. Jianguo Li

E-Mail Website
Guest Editor
School of Aeronautics, Northwestern Polytechnical University, Xi’an, China
Interests: mechanical behavior; deformation mechanism; constitutive model of metal structural materials
Dr. Kun Jiang

E-Mail Website
Guest Editor
Center for X-Mechanics, Zhejiang University, Hangzhou 310027, China
Interests: constitutive model of metal structural materials

Special Issue Information

Dear Colleagues,

HEAs have attracted considerable attention in recent years as an emerging type of multi-element alloy system. The new design concept of HEAs with multiple principal elements breaks the limitations of traditional alloys, providing materials engineers with new material design ideas and optimization solutions and opening up new possibilities for material properties. However, they still face challenges in practical applications, such as large-scale fabrication and extreme mechanical properties, which have prompted researchers to conduct more in-depth exploration and innovation.

This Special Issue aims to collect the latest international research results on HEAs, exploring the fabrication, characterization, mechanical behavior, and application prospects in different fields, such as aviation, aerospace, and navigation. We sincerely invite you and related researchers worldwide to actively contribute, share the research results, innovative ideas, and experimental results, and jointly promote the scientific development of HEAs in fabrication, characterization, mechanical behaviors, and application.

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

  1. Synthesis and preparation methods of HEAs;
  2. Microstructural characterization and analysis techniques of the HEAs;
  3. Mechanical properties and micro-deformation mechanisms of HEAs;
  4. Application and development of HEAs in cutting-edge fields such as aviation, aerospace, and navigation.

We look forward to receiving your contributions.

Dr. Jianguo Li
Dr. Kun Jiang
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. Materials is an international peer-reviewed open access semimonthly 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 alloy
  • fabrication
  • characterization
  • mechanical properties
  • deformation mechanism
  • engineering application

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Published Papers (1 paper)

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Research

18 pages, 6546 KiB  
Article
Microstructure and Properties of AlxCr1−xCoFeNi High-Entropy Alloys Prepared by Spark Plasma Sintering
by Gang Li, Xiangran Meng, Chunpin Geng, Chongshuo Wang, Haifang Ren, Xiaoying Guo, Sinan Li and Ying Tao
Materials 2025, 18(4), 755; https://doi.org/10.3390/ma18040755 - 8 Feb 2025
Viewed by 777
Abstract
CoCrFeNi high-entropy alloys represent a novel structural material with considerable application potential in a variety of fields, including aerospace, automobiles, ships, machining, energy, soft magnetic materials, and hydrogen storage materials. The present study investigates the impact of the Al element on the structure [...] Read more.
CoCrFeNi high-entropy alloys represent a novel structural material with considerable application potential in a variety of fields, including aerospace, automobiles, ships, machining, energy, soft magnetic materials, and hydrogen storage materials. The present study investigates the impact of the Al element on the structure and properties of the alloy. The preparation of the AlxCr1−xCoFeNi (x = 0.1, 0.2, 0.3, 0.4, 0.5) powders involved the use of a variety of elemental metal powders as raw materials and a mechanical alloying process at 350 rpm for 40 h. The sintering of the alloy powders was subsequently conducted using spark plasma sintering at 1000 °C. The microstructure of the alloys was analyzed using XRD, SEM, and EDS, and the properties were analyzed using a universal testing machine, a hardness measurement, friction and wear measurement, and an electrochemical workstation. The study shows that when x = 0.1, the crystal structure of Al0.1Cr0.9CoFeNi consists of a double FCC phase and a trace amount of σ phase. As the aluminum content increases, part of the FCC phase begins to transform to BCC. When x = 0.2~0.5, the alloy consists of a double FCC phase and a BCC phase and a trace amount of a sigma phase. As the BCC phase in the alloy increases, the tensile strength of the alloy increases, the ability to deform plastically decreases, and the hardness increases. The highest ultimate tensile strength of 1163.14 MPa is exhibited by Al0.5Cr0.5CoFeNi, while the minimum elongation is 26.98% and the maximum hardness value is 412.6 HV. In the initial stage of friction measurement, the wear mechanism of AlxCr1−xCoFeNi is adhesive wear. However, as the test time progresses, an oxide layer begins to form on the alloy’s surface, leading to a gradual increase in the friction coefficient. At this stage, the wear mechanism becomes a combination of both adhesive and abrasive wear. Once the oxidation process and the wear process have reached a dynamic equilibrium, the friction coefficient stabilizes, and the wear mechanism transitions to a state of abrasive wear. The Al0.1Cr0.9CoFeNi alloy demonstrates the lowest friction coefficient and wear rate, exhibiting values of 0.513 and 0.020 × 10−3 mm3/Nm, respectively, while the Al0.5Cr0.5CoFeNi alloy demonstrates the highest performance, with a self-corrosion voltage of 0.202 V in a 3.5 wt.% NaCl solution. The experimental findings demonstrate that, in the presence of a decline in the Cr element within a high-entropy alloy, an augmentation in the Al element can facilitate the transition of the FCC phase to the BCC phase within the alloy, thereby enhancing its mechanical properties. However, in the AlxCr1−xCoFeNi HEAs, the presence of the Cr-rich and Cr-poor phases invariably results in selective corrosion in a neutral NaCl solution. The corrosion resistance of this alloy is weaker than that of a single-phase solid solution alloy with a similar chemical composition that only undergoes pitting corrosion. Full article
(This article belongs to the Special Issue Fabrication, Characterization, and Application of High Entropy Alloy)
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