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Metals
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Advances in High-Entropy Alloys’ Microstructure, Properties and Preparation
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Advances in High-Entropy Alloys’ Microstructure, Properties and Preparation

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 February 2025 | Viewed by 1480

Special Issue Editor

Dr. Chao Yang

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Interests: high entropy alloys; high-throughput alloy design; additive manufacturing; powder metallurgy
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The advent of high- and medium-entropy alloys (HEAs and MEAs) has broken through traditional alloy design methodologies, attracting increasing research attention due to their advanced performance and outstanding properties. Recent progress in compositional and structural design concepts, as well as preparation techniques, have further enhanced the performance of HEAs and MEAs, a topic within the scope of this Special Issue. Owing to excellent strength–ductility tradeoff, fracture toughness at ambient and cryogenic temperatures, high-temperature capability, tribological performance, irradiation behavior, corrosion/oxidation resistance, etc., HEAs and MEAs are considered promising candidates for future applications in a wide range of industries, including in the aerospace, nuclear, marine, biomedical, energy, and mining fields.

In this Special Issue, we welcome review articles and research papers that focus on microstructure, property, and preparation advances in high-entropy alloys and shed light on future research directions. The topics will include but are not limited to the following: (1) various types of HEAs and MEAs, including 3D transitional, refractory, lightweight, single-phase, precipitation-strengthened, eutectic/eutectoid, gradient, and bimodal-grained models; (2) various strengthening and plasticity mechanisms, including twining, phase transformation, dispersed particles, nanostructures, dislocation structures, microbands, and cell structures; (3) various advanced design methods, including high-throughput thermodynamics/kinetics calculation and screening, machine learning, molecular dynamics, and density functional theory; (4) various advanced preparation techniques, including arc-melting, powder metallurgy, additive manufacturing for bulk HEAs and MEAs, and jet/plasma spraying for HEA and MEA coatings; and (5) various advanced characterization tools, including 3D atomic probe tomography and in situ transmission electron microscope.

Dr. Chao Yang
Guest Editor

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
  • medium-entropy alloys
  • refractory high-entropy alloys
  • mechanical performance
  • computational-aided design
  • powder metallurgy
  • additive manufacturing
  • transformation-induced plasticity
  • heterostructure

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Published Papers (2 papers)

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Research

16 pages, 7149 KiB  
Article
Corrosion Behavior and Microhardness of a New B4C Ceramic Doped with 3% Volume High-Entropy Alloy in an Aggressive Environment
by Alberto Daniel Rico-Cano, Julia Claudia Mirza-Rosca, Burak Cagri Ocak and Gultekin Goller
Metals 2025, 15(1), 79; https://doi.org/10.3390/met15010079 - 17 Jan 2025
Viewed by 522
Abstract
The aim of this paper is to study both the mechanical and chemical properties of a new material composed of B4C doped with 3% volume of CoCrFeNiMo HEA by the spark plasma sintering technique. Scanning electron microscopy and microhardness were used [...] Read more.
The aim of this paper is to study both the mechanical and chemical properties of a new material composed of B4C doped with 3% volume of CoCrFeNiMo HEA by the spark plasma sintering technique. Scanning electron microscopy and microhardness were used to characterize the composite microstructure and hardness. Corrosion behavior was studied by corrosion potential, corrosion rate and electrochemical impedance spectroscopy, where the equivalent circuit was obtained, characterized by the presence of the Warburg element. The addition of HEA resulted in a more compact microstructure, filling pores and inhibiting ceramic grain growth. A microhardness statistical analysis revealed that the sample followed a normal distribution, which suggests that the sample has a homogeneous structure. The doped material exhibits excellent corrosion resistance in artificial seawater, where its chemical interaction occurs in two steps, with an important diffusional component. This study highlights the potential for use in environments where both corrosion resistance and mechanical strength are critical factors. Full article
(This article belongs to the Special Issue Advances in High-Entropy Alloys’ Microstructure, Properties and Preparation)
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12 pages, 7334 KiB  
Article
Microstructure and Wear Behavior of AlxCoCuNiTi (x = 0, 0.4, and 1) High-Entropy Alloy Coatings
by Mingxing Ma, Zhixin Wang, Chengjun Zhu, Ying Dong, Liang Zhao, Lixin Liu, Dachuan Zhu and Deliang Zhang
Metals 2024, 14(11), 1280; https://doi.org/10.3390/met14111280 - 11 Nov 2024
Cited by 1 | Viewed by 710
Abstract
AlxCoCuNiTi (x = 0, 0.4, and 1) high-entropy alloy coatings on 45 steel substrates were prepared by laser cladding, and their phase structure, microstructure, element partition, and wear behavior were investigated. The results show that the AlxCoCuNiTi (x = [...] Read more.
AlxCoCuNiTi (x = 0, 0.4, and 1) high-entropy alloy coatings on 45 steel substrates were prepared by laser cladding, and their phase structure, microstructure, element partition, and wear behavior were investigated. The results show that the AlxCoCuNiTi (x = 0, 0.4, and 1) coatings have a dual-phase structure of FCC and BCC. With the increase of x from 0 to 1, the content of the FCC phase decreases from 66.9 wt.% to 14.3 wt.%, while the content of the BCC phase increases from 33.1 wt.% to 85.7 wt.%. When x = 0.4, the lattice constants of the two phases are the largest, and their densities are the smallest. The microstructure of the AlxCoCuNiTi (x = 0, 0.4, and 1) coatings is composed of BCC-phase dendrites and FCC-phase interdendrite regions. Ti is mainly enriched in the primary phase or BCC dendrites, Cu is enriched in the interdendrite regions, and Al is enriched in the dendrites. The friction coefficients of AlxCoCuNiTi (x = 0, 0.4, and 1) coatings during wear tests are 0.691, 0.691, and 0.627, respectively. The lowering of the wear friction coefficient when increasing the Al content is mainly related to the change in phase structure, microstructure, and wear mechanism. Full article
(This article belongs to the Special Issue Advances in High-Entropy Alloys’ Microstructure, Properties and Preparation)
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