Research on High Entropy Alloys: Design of Experiment and Machining Parameters

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Corrosion, Wear and Erosion".

Deadline for manuscript submissions: 15 May 2025 | Viewed by 423

Special Issue Editors


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Guest Editor
School of Materials Science and Engineering, University of Science and Technology, Zhenjiang 212100, China
Interests: superalloys; high entropy alloys

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Guest Editor
School of Materials and Engineering, Jiangsu University, Zhenjiang 212000, China
Interests: the disign of high performance metallic composite materials

Special Issue Information

Dear Colleagues

High-entropy alloys (HEAs) are multi-component systems based on the novel alloy design strategy of configurational entropy maximization. They are defined as single-phase or multiphase alloys consisting of at least five principal elements with their components in the range of 5~35 at. %. Over the past decade, they have been one of the hottest research topics in metallic materials. They exhibit superior mechanical properties, such as high strength, outstanding thermal stability, excellent resistances to wear, corrosion, and oxidation, and sometimes good ductility. Driven by the current state of knowledge of HEAs and their applications in the industrial requirements, there is still a tremendous demand for experimental, theoretical, and prediction research.

The scope of this Special Issue will serve as a forum for papers in the following branches:

  1. The alloying behaviors of various elements, including principal elements and trace elements.
  2. Recent advances on the understanding the deform mechanisms, especially the mechanisms responsible for the high strength of the alloys, good/poor ductility.
  3. The predication phase composition and the thermodynamics analysis of the HEAs.
  4. The design theory of novel HEAs.
  5. The performance of wear, corrosion, and oxidation, hot corrosion of the HEAs, and the underlying mechanisms responsible for the performance.
  6. The potential applications of the HEAs as structural materials, composite materials, and coatings.

Dr. Pengjie Zhou
Prof. Dr. Guirong Li
Guest Editors

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Keywords

  • high-entropy alloy
  • phase composition
  • thermodynamics
  • ductility
  • mechanical properties

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Published Papers (1 paper)

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Research

15 pages, 9696 KiB  
Article
Electron Beam Surface Treatment and Its Impact on the Plasticity of Fe-Based High-Entropy Alloy
by Stefan Valkov, Georgi Kotlarski, Stoyan Parshorov, Maria Ormanova, Fatme Padikova, Borislav Stoyanov and Ivan Parshorov
Coatings 2025, 15(4), 477; https://doi.org/10.3390/coatings15040477 - 17 Apr 2025
Viewed by 225
Abstract
In this work, we present results on the impact of electron beam surface modification on the phase composition, microstructure, chemical composition, and mechanical properties of Fe-Ni-Cr-Mo-W high-entropy alloy. During the experiments, the beam power was 600 and 1200 W. The phase composition was [...] Read more.
In this work, we present results on the impact of electron beam surface modification on the phase composition, microstructure, chemical composition, and mechanical properties of Fe-Ni-Cr-Mo-W high-entropy alloy. During the experiments, the beam power was 600 and 1200 W. The phase composition was studied using XRD measurements. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) were used to analyze the microstructure and chemical composition, respectively. The results showed that at the lower value of the power of the electron beam, a distinguished modified zone cannot be observed. With an increase in the discussed technological parameter, a treated zone with a thickness of about 30 μm can be seen on the top of the sample. The modulus of elasticity on the surface of the unprocessed alloy was measured to be 130 GPa and increased to 156 GPa in the case of both technological regimes of the electron beam surface modification process. The hardness on the top of the untreated alloy was about 4.5 GPa and reduced to about 3 GPa in the case of electron beam treatment on the alloy with a beam power of 600 W. The application of the modification process with a higher value of beam power, 1200 W, led to an even further decrease in the hardness, to about 2.8 GPa. The resistance to plastic deformation of the surface of the considered specimens was also analyzed via the H3/E2 ratio, and the results show that the application of the treatment procedure leads to a decrease in the resistance to plastic deformation in both cases. This decrease is more pronounced in the case of the treatment with the higher value of power of the electron beam. Full article
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