Prospect Methods for Manufacturing of High-Entropy Alloys: Composition, Microstructure, and Properties

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 (31 December 2022) | Viewed by 4912

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Guest Editor
Department of Metals Technology and Aviation Materials, Samara National Research University, Moskovskoye Shosse 34, Samara 443086, Russia
Interests: high-entropy alloys; additive manufacturing; high-entropy materials; composition–structure–properties relationships; high-entropy alloy design; high-entropy coatings; process optimization; mechanical properties; processing innovation; process control; phase quantification and measurement; microstructure evolution; non-destructive characterization; defect quantification and prediction; mechanical design and testing; material and process modeling; integrated computational materials engineering; forming, joining, machining, welding; corrosion; fatigue and fracture; structural applications (automotive, aerospace, etc.)
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Special Issue Information

Dear Colleagues,

High-entropy alloys (HEAs) are a new design concept—alloys which consist of several principal elements (more than three) but no single dominant element, in contrast to traditional dilute alloys. This chemical composition provides properties which are not observed in conventional alloys composed of one or two main components and several alloying elements. These unique effects include a high entropy of mixing, severe lattice distortion, sluggish diffusion, and “cocktail effect”, which contribute to enhancing mechanical, corrosive, and thermal stability properties of the material.

Modern methods for manufacturing high-entropy alloys are not limited by traditional casting but also include additive manufacturing technologies, such as selective laser melting, direct metal deposition, electron beam melting, wire-arc additive manufacturing, etc. Some promising methods for the fabrication of high-entropy alloys are various coating-deposition technologies that significantly improve the properties of the base substrates.

This Special Issue is an excellent opportunity for materials scientists, engineers, and inventors worldwide to publish their latest works on new and prospective methods of manufacturing of high-entropy alloys. Any new methods for end applications in automotive, aerospace, and marine fields are welcome. Therefore, this Special Issue will cover—but is not limited to—the following fundamental and applied research topics:

  • High-entropy alloys;
  • Additive manufacturing;
  • High-entropy materials;
  • Composition–structure–properties relationships;
  • High-entropy alloy design;
  • High-entropy coatings;
  • Process optimization;
  • Mechanical properties;
  • Processing innovation;
  • Process control;
  • Phase quantification and measurements;
  • Microstructure evolution;
  • Non-destructive characterization;
  • Defect quantification and prediction;
  • Mechanical design and testing;
  • Material and process modeling;
  • Integrated computational materials engineering;
  • Forming, joining, machining, welding;
  • Corrosion;
  • Fatigue and fracture;
  • Structural applications (automotive, aerospace, etc.).

In keeping with the longstanding tradition of publishing the most recent and highest-quality work in Special Issues of Metals, this Special Issue features a collection of manuscripts entitled “Prospect Methods for the Manufacturing of High-Entropy Alloys: Composition, Microstructure, and Properties”. This Special Issue features the finest and latest-breaking articles in high-entropy alloy manufacturing methods in 2022, and is listed with the main indexing services, making the articles readily searchable, available on the Web, and citable.

Please ensure your paper is submitted on time. Thank you for your interest in this Special Issue of Metals.

Prof. Dr. Sergey Konovalov
Guest Editor

Manuscript Submission Information

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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.

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Keywords

  • high-entropy alloys
  • additive manufacturing
  • high-entropy materials
  • composition–structure–properties relationships
  • high-entropy alloy design
  • high-entropy coatings
  • process optimization
  • mechanical properties
  • processing innovation
  • process control
  • phase quantification and measurements
  • microstructure evolution
  • non-destructive characterization
  • defect quantification and prediction
  • mechanical design and testing
  • material and process modeling
  • integrated computational materials engineering
  • forming, joining, machining, welding
  • corrosion
  • fatigue and fracture
  • structural applications (automotive, aerospace, etc.)

 

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Published Papers (2 papers)

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Research

12 pages, 3167 KiB  
Article
Investigation of Structure and Mechanical Characteristics of a High Manganese Steel via SolidCast Simulation Method
by Hussein Alrobei, Rizwan Ahmed Malik, Farhan Amjad and Ibrahim AlBaijan
Metals 2023, 13(3), 572; https://doi.org/10.3390/met13030572 - 12 Mar 2023
Viewed by 2057
Abstract
Casting is a fabrication method used to create various industrial parts with different shapes. Flaws such as shrinkage, porosity, and short metal filling can result in casting rejection. These flaws are heavily reliant on casting parameter design (gating and riser system design) and [...] Read more.
Casting is a fabrication method used to create various industrial parts with different shapes. Flaws such as shrinkage, porosity, and short metal filling can result in casting rejection. These flaws are heavily reliant on casting parameter design (gating and riser system design) and can be reduced by optimizing the casting parameter design. The development of materials with new or improved properties has long been the primary objective of materials scientists. The designing of metallic alloys for structural purposes must take strength, toughness, and formability into account to achieve the desired performance. The unique convergence of these essential characteristics that characterize high manganese steels fascinate scientists worldwide. The current work systematically investigated a gating system and riser design effect for high Manganese steel samples (bushes) to develop an understanding of the structure–property relationship. The first conventional manual calculation was performed to design the gating and riser system. Subsequently, a sophisticated simulation software called SolidCast was used to design, validate, and improve the casting parameters of the specimen. To back up the findings, confirmatory experiments were carried out. Both designs were used to make castings in order to check for flaws. The microstructural and mechanical characteristics of these materials were investigated. Visual inspection of the manually-designed castings revealed considerable shrinkage, whereas software-designed castings seemed in good shape, without the shrinkage, macroporosity, and microporosity. The microstructure of the specimens was also studied by applying optical microscopy and SEM analysis. By improving the gating and riser system with the SolidCast software, sound casting was achieved. This improved the quality of casting results with a considerable enhancement of yield strength (~32 percent), hardness (~34 percent), and tensile strength (~27 percent), which may lead to significant cost savings. Full article
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11 pages, 5307 KiB  
Article
Characterization of Al-Co-Cr-Fe-Mn-Ni High-Entropy Alloy Coating Fabricated onto AA5083 Using Wire-Arc Additive Manufacturing
by Kirill Osintsev, Sergey Konovalov, Yurii Ivanov, Victor Gromov, Sergey Vorobyev and Irina Panchenko
Metals 2022, 12(10), 1612; https://doi.org/10.3390/met12101612 - 27 Sep 2022
Cited by 3 | Viewed by 2382
Abstract
Fabrication of thick (more than 3 mm) hard coatings on Al-Mg alloys might provide better performance in terms of increased durability, wear resistance and hardness compared with the unmodified material. In this study we fabricated Al-Co-Cr-Fe-Mn-Ni high-entropy alloy coating by wire-arc additive manufacturing [...] Read more.
Fabrication of thick (more than 3 mm) hard coatings on Al-Mg alloys might provide better performance in terms of increased durability, wear resistance and hardness compared with the unmodified material. In this study we fabricated Al-Co-Cr-Fe-Mn-Ni high-entropy alloy coating by wire-arc additive manufacturing onto AA5083 substrate. The aim of this study is to investigate the microstructure and mechanical properties of the coating and its influence on the substrate. Scanning electron microscopy and transmission electron microscopy were used to characterize the microstructure and elemental composition of the obtained coating. Microhardness and tribological tests were implemented to evaluate the mechanical properties. The results showed homogeneous distribution of the elements alongside the transversal direction in the coating which has the following average chemical composition: Al 8 at. %, Co 28 at. %, Cr 13 at. %, Fe 33 at. %, Mn 3 at. %, Ni 15 at. %. The wear rate of the coating decreased by ~five times comparing with the substrate, while the Vickers hardness improved by ~three times. The highest level of hardness accounting for 1010 ± 80 HV was observed in the transition zone between the coating and the substrate which might be attributed to high micro- and macrostress levels appeared in this zone. The study showed the practical applicability of wire-arc additive manufacturing method to fabricate a high-entropy alloy on Al-Mg substrate. Full article
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