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Metals
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High-Entropy Alloys: Structures, Properties and Applications
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High-Entropy Alloys: Structures, Properties and Applications

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

Deadline for manuscript submissions: closed (30 April 2023) | Viewed by 6468

Special Issue Editors

Dr. Hui Jiang

E-Mail Website
Guest Editor
College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Interests: high entropy alloy; eutectic; mechanical properties; corrosion
Special Issues, Collections and Topics in MDPI journals
Dr. Chia-Lin Li

E-Mail Website
Guest Editor
Department of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan
Interests: high-entropy alloys; metallic glasses; coatings

Special Issue Information

Dear Colleagues,

High-entropy alloys represent a new paradigm for the design of metallic alloys with salient properties. Recently, high-entropy alloys have been an object of great interest for researchers due to their excellent properties, such as high strength, ductility, corrosion and creep resistance. The main prerequisite for the future success of high-entropy alloys is the further improvement and development of existing novel high-entropy alloys. The properties of high-entropy alloys mainly depend on their structure, from the atomic- to macro-scale. This Special Issue focuses on fundamental development trends together with the most recent advances in the high-entropy alloy field, including their synthesis, characterization, structures, properties and applications. With this aim in mind, we are inviting the submission of research work investigating the structure of high-entropy alloys and relating their structure with different properties.

Dr. Hui Jiang
Dr. Chia-Lin Li
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
  • characterization
  • microstructure
  • strength
  • ductility
  • hard
  • wear
  • corrosion
  • physical properties

Published Papers (4 papers)

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Research

9 pages, 4225 KiB  
Communication
Microstructure and Properties of Non-Equiatomic Ni10Cr6WFe9TiAlx High-Entropy Alloys Combined with High Strength and Toughness
by Xigang Yang, Lin He, Erhong Li and Chenglong Yang
Metals 2023, 13(7), 1179; https://doi.org/10.3390/met13071179 - 25 Jun 2023
Cited by 1 | Viewed by 745
Abstract
High-entropy alloys (HEAs) with excellent mechanical properties have broad application scope and application prospects. However, it is difficult to obtain the optimized element composition, based on the traditional equiatomic or near-equiatomic statistical analysis of the phase selection rules. The non-equiatomic HEAs have abundant [...] Read more.
High-entropy alloys (HEAs) with excellent mechanical properties have broad application scope and application prospects. However, it is difficult to obtain the optimized element composition, based on the traditional equiatomic or near-equiatomic statistical analysis of the phase selection rules. The non-equiatomic HEAs have abundant constituents combination by optimizing the type and content of elements. In this study, Ni10Cr6WFe9TiAlx (x = 0, 1.0 and 1.5, at.%) HEAs were prepared by vacuum arc melting. The effect of Al content x on microstructure and mechanical properties of HEAs was systematically studied. The results show that the HEAs are composed mainly of face-centered cubic (FCC) with hexagonal Al2W phase. The increase of Al content promotes the formation of the hexagonal Al2W phase. When the Al mole content is 1.0, the Ni10Cr6WFe9TiAl HEA material has achieved superior mechanical properties. The alloy exhibited a high ultimate tensile strength of 741 MPa and a large total elongation of 46%. The improvement in the mechanical properties of the Ni10Cr6WFe9TiAl HEA is mainly attributed to the precipitation strengthening of the high-density Al2W phase. This work provides a reference for the future design of Al2W precipitation-strengthened non-equiatomic HEAs with ideal properties. Full article
(This article belongs to the Special Issue High-Entropy Alloys: Structures, Properties and Applications)
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18 pages, 6709 KiB  
Article
Effect of Nitrogen Doping on the Structure and Mechanical Properties of the Fe40Mn40Cr10Co10 High-Entropy Alloy
by Anastasiia Semenyuk, Elizaveta Povolyaeva, Vitalii Sanin, Sergey Zherebtsov and Nikita Stepanov
Metals 2022, 12(10), 1599; https://doi.org/10.3390/met12101599 - 25 Sep 2022
Cited by 6 | Viewed by 1738
Abstract
The structure and mechanical properties of as-cast and thermomechanicaly processed (cold rolling followed by annealing at 700 °C and 900 °C) Fe40Mn40Cr10Co10 (at.%) high-entropy alloys doped with different amounts (0, 0.5, and 2.0 at.%) of N [...] Read more.
The structure and mechanical properties of as-cast and thermomechanicaly processed (cold rolling followed by annealing at 700 °C and 900 °C) Fe40Mn40Cr10Co10 (at.%) high-entropy alloys doped with different amounts (0, 0.5, and 2.0 at.%) of N were examined. The as-cast Fe40Mn40Cr10Co10 alloy (N0) contained σ-phase particles at the boundaries of the fcc grains. The addition of 0.5 (N0.5) and 2.0 (N2) at.% of nitrogen suppressed the formation of the σ-phase due to which the alloys consisted of only the fcc phase. Annealing after rolling resulted in the development of static recrystallization and precipitation of additional phases: the σ-phase was found in the N0 and N0.5 alloys, and hexagonal M2N nitrides were found in the N2 alloy. The strength of the as-cast alloys at room temperature increased with increasing nitrogen concentration due to interstitial solid solution strengthening. Cold rolling and subsequent annealing resulted in considerable strengthening of the program alloys. The strength of the alloys increased with the N content and decreased with increasing annealing temperature. The best combination of mechanical properties at room temperature was attained in the N2 alloy after annealing at 700 °C, and at 77 K, was demonstrated by the N0.5 alloy after annealing at 900 °C. Full article
(This article belongs to the Special Issue High-Entropy Alloys: Structures, Properties and Applications)
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16 pages, 4485 KiB  
Article
Effect of Heat Treatment on Microstructure, Tensile Properties and High-Temperature Corrosion Resistance of the FeCrMnNi High Entropy Alloy
by Zhen Cai, Na Wei, Yaolei Han, Fang Si, Lei Mi, Chenhui Zhang, Xiaohua Liu, Fengyang Jiang and Tiandong Wu
Metals 2022, 12(9), 1537; https://doi.org/10.3390/met12091537 - 16 Sep 2022
Cited by 4 | Viewed by 2195
Abstract
FeCrMnNi high-entropy alloys prepared by vacuum induction melting were tested and characterized using an X-ray diffractometer, a scanning electron microscope, a micro hardness tester and a universal tensile tester to investigate the effects of the heat treatment temperature on the microstructure and mechanical [...] Read more.
FeCrMnNi high-entropy alloys prepared by vacuum induction melting were tested and characterized using an X-ray diffractometer, a scanning electron microscope, a micro hardness tester and a universal tensile tester to investigate the effects of the heat treatment temperature on the microstructure and mechanical properties of the alloys and the heat-resistant corrosion properties of FeCrMnNi alloy after annealing at 800 °C. It is a high-entropy alloy with a typical dendritic (DR) morphology. With the increase in the heat-treatment temperature, the amount of ultrafine precipitates with the BCC structure in the matrix increased; furthermore, the amount of ultrafine precipitates started to decrease at temperatures above 900 °C, and the DR structure gradually weakened. After heat treatment at temperatures above 800 °C, the alloy showed a tensile strength of 721.1 MPa and an elongation at break of 26.7%, which indicates improved strength of the alloy while maintaining good plasticity, mainly because a large amount of nanoscale particles precipitated between the DR structures and enabled fine grain strengthening. Therefore, an appropriate heat-treatment temperature helps to improve the overall mechanical properties of the high-entropy alloy. Full article
(This article belongs to the Special Issue High-Entropy Alloys: Structures, Properties and Applications)
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14 pages, 4111 KiB  
Article
Effect of Annealing Temperatures on Phase Stability, Mechanical Properties, and High-Temperature Steam Corrosion Resistance of (FeNi)67Cr15Mn10Al5Ti3 Alloy
by Zhen Cai, Fengyang Jiang, Na Wei, Lei Mi, Chenhui Zhang, Xiaohua Liu, Fang Si and Tiandong Wu
Metals 2022, 12(9), 1467; https://doi.org/10.3390/met12091467 - 1 Sep 2022
Viewed by 1272
Abstract
The effect of different annealing temperatures on the phase stability and mechanical properties of (FeNi)67Cr15Mn10Al5Ti3 high-entropy alloys (HEAs) was studied. The phase stability was analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), and [...] Read more.
The effect of different annealing temperatures on the phase stability and mechanical properties of (FeNi)67Cr15Mn10Al5Ti3 high-entropy alloys (HEAs) was studied. The phase stability was analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), and electron backscattering diffraction (EBSD). The mechanical properties of the alloy were characterized by hardness and tensile tests. Furthermore, the heat-resistant corrosion properties of the (FeNi)67Cr15Mn10Al5Ti3 alloy after annealing at 800 °C was tested under high-temperature steam. The results indicated that HEAs exposed to different annealing temperatures always exhibited the face-centered cubic (FCC) phase. With rising annealing temperature, the dendrite structure of the alloys in the as-cast condition gradually disappeared, with recrystallization and precipitation of larger grains. The tensile strength of the alloy first increased and then decreased with the rising annealing temperature, the hardness and yield strength of the alloy decreased slightly, and the tensile elongation varied greatly. These findings can be used as a basis for improving the phase stability and mechanical properties of a Cr-Fe-Ni-Mn-HEA system with unequal atomic ratios. The heat and corrosion resistance of the alloy at 360 °C and 400 °C was better than that of Zr-4 alloy. Full article
(This article belongs to the Special Issue High-Entropy Alloys: Structures, Properties and Applications)
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