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Crystals
Special Issues
High-Entropy Alloys: Progress and Prospects
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High-Entropy Alloys: Progress and Prospects

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystalline Metals and Alloys".

Deadline for manuscript submissions: closed (20 December 2023) | Viewed by 3115

Special Issue Editors

Dr. Jie Xiong

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen 518055, China
Interests: high-entropy alloy; phase prediction; data-driven approaches; tensile property; amorphous alloys; low-alloy steels
Dr. Baojun Dong

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen 518055, China
Interests: corrosion behavior of stainless steel; coastal marine corrosion; oil and gas corrosion

Special Issue Information

Dear Colleagues,

High-entropy alloys are considered promising candidates for various applications due to their superior mechanical properties, corrosion resistance, irradiation resistance, oxidation resistance, wear resistance, catalytic activity, etc. High-entropy alloys have attracted wide attention in recent years; thus, we proposed this Special Issue to summarize the progress and advances of high-entropy alloys. The present Special Issue will focus on the following aspects of high-entropy alloys:

High-entropy alloys for applications in special environments such as marine environments and irradiated environments;

Mechanical properties, corrosion resistance, microstructure evolutions, and deformation mechanisms of high-entropy alloys;

The rational data-driven design of high-entropy alloys with desired microstructures or properties;

Simulation techniques of high-entropy alloys such as the molecular dynamic, phase field, and first principles calculation;

The additive manufacturing of high-entropy alloys, such as the selective laser melting, and the laser cladding.

Other related works or review articles about high-entropy alloys are also encouraged.

Dr. Jie Xiong
Dr. Baojun Dong
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. Crystals 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 alloy
  • medium-entropy alloy
  • complex concentrated alloy
  • amorphous alloy
  • phase prediction
  • mechanical property
  • additive manufacturing
  • hydrogen embrittlement
  • corrosion resistant
  • first principles calculation
  • phase field
  • machine learning approaches
  • marine environment
  • radiation environment

Published Papers (3 papers)

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Research

18 pages, 13327 KiB  
Article
Atomistic Study on Defect–Grain Boundary Interactions in TiVTa Concentrated Solid–Solution Alloys
by Linfeng Wang, Yongpeng Zhao, Yankun Dou, Xinfu He, Zhongao Zhang, Mengyao Chen, Huiqiu Deng and Wen Yang
Crystals 2024, 14(2), 166; https://doi.org/10.3390/cryst14020166 - 6 Feb 2024
Viewed by 890
Abstract
The elemental segregation behaviors and interactions between point defects and symmetrical tilt grain boundaries (GBs) in TiVTa concentrated solid–solution alloys (CSAs) have been studied through hybrid Monte Carlo/molecular dynamics (MC/MD) simulations. A pure V model, a random TiVTa CSA with randomly distributed elements, [...] Read more.
The elemental segregation behaviors and interactions between point defects and symmetrical tilt grain boundaries (GBs) in TiVTa concentrated solid–solution alloys (CSAs) have been studied through hybrid Monte Carlo/molecular dynamics (MC/MD) simulations. A pure V model, a random TiVTa CSA with randomly distributed elements, and an equilibrated TiVTa CSA with Ti segregation were constructed to investigate the influence of chemical disorder and local elemental segregation on defect–GB interactions. For defect–GB interactions, GBs interact more strongly with interstitials than with vacancies. Compared with the pure V, the vacancy absorption length scale of GBs is greater, whereas the interstitial absorption length scale of GBs is shorter in TiVTa CSAs due to the chemical fluctuation and local lattice distortion. This means a higher recombination efficiency of point defects in TiVTa CSAs. The elemental (Ti) segregation in TiVTa CSAs can further enhance the sink strength of GBs towards interstitials, while simultaneously reducing their sink strength towards vacancies. Consequently, the preference effects of GBs towards interstitials and vacancies are amplified in the equilibrated CSA due to local ordering, thereby reducing efficient defect annihilation around GBs. These results provide fundamental insights into the irradiation defect dynamics of CSAs with body-centered cubic (bcc) structure. Full article
(This article belongs to the Special Issue High-Entropy Alloys: Progress and Prospects)
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14 pages, 9242 KiB  
Article
Effect of Mo on the Corrosion Resistance of Cr-Containing Steel in a Simulated Tropical Marine Atmospheric Environment
by Ningxi Wang, Jianzhuo Gao and Xuexu Xu
Crystals 2024, 14(2), 113; https://doi.org/10.3390/cryst14020113 - 24 Jan 2024
Viewed by 791
Abstract
In this manuscript, the effect of Mo addition on the corrosion resistance of the low-alloy steel in a simulated tropical marine atmospheric environment has been studied through microstructure characterization, corrosion immersion experiments, electrochemical measurement, and a series of microscopic characterization methods. The results [...] Read more.
In this manuscript, the effect of Mo addition on the corrosion resistance of the low-alloy steel in a simulated tropical marine atmospheric environment has been studied through microstructure characterization, corrosion immersion experiments, electrochemical measurement, and a series of microscopic characterization methods. The results show that Mo has the ability to reduce the corrosion rate of low-alloy steel in a marine atmospheric environment, with a more pronounced reduction effect observed over longer corrosion periods. The addition of Mo enhances the corrosion product film’s compactness when coupled with Cr, subsequently improving corrosion resistance. Simultaneously, MoO42−, acting as a slow-release ion, can effectively suppress localized corrosion in low-alloy steel. The research findings can offer data support and a theoretical foundation for the design of low-alloy steels with enhanced corrosion resistance in a tropical marine atmospheric environment. Full article
(This article belongs to the Special Issue High-Entropy Alloys: Progress and Prospects)
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21 pages, 18836 KiB  
Article
High-Temperature Oxidation Behavior of FeCoCrNi+(Cu/Al)-Based High-Entropy Alloys in Humid Air
by Emma Marie Hamilton White, Mary-Lee Bürckner, Clara Schlereth, Maciej Bik and Mathias Christian Galetz
Crystals 2024, 14(1), 60; https://doi.org/10.3390/cryst14010060 - 31 Dec 2023
Cited by 1 | Viewed by 1154
Abstract
Previous studies showed some transition metal high-entropy alloy (HEA) compositions can have good oxidation resistance in air up to 800 °C. Four equiatomic HEAs have been developed based on FeCoCrNi with additions of Mn, Cu, Al or Al+Cu. The oxidation behavior of these [...] Read more.
Previous studies showed some transition metal high-entropy alloy (HEA) compositions can have good oxidation resistance in air up to 800 °C. Four equiatomic HEAs have been developed based on FeCoCrNi with additions of Mn, Cu, Al or Al+Cu. The oxidation behavior of these HEAs was compared in humid (10 vol.% H2O) air at 800 °C for 100–500 h to investigate the influence of water vapor on the oxidation mechanisms. The Cu- and Al-containing alloys exhibited improved oxidation resistance over the Mn composition. For the Cu-containing alloy, a local attack of the Cu-rich phase was observed, which formed an Fe/Ni/Co/Cr spinel that was surrounded by Cr2O3. This oxide was thicker for the humid air atmosphere when compared to dry air, and the transition of the Cu oxide to the spinel was accelerated. The Al-containing HEA formed a thin Al2O3 scale with humidity suppressing AlN formation and forming a smoother oxide layer. The Al+Cu composition had the highest overall oxidation resistance (minimal local attack, no nitridation) and also showed a smooth oxide scale topography under humid air oxidation as opposed to a plate-like, rougher scale under dry air. Full article
(This article belongs to the Special Issue High-Entropy Alloys: Progress and Prospects)
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