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Special Issue "Additive Manufacturing and Welding Technologies for High-Entropy Alloys and Dissimilar Metals"

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Metals and Alloys".

Deadline for manuscript submissions: 20 July 2023 | Viewed by 455

Special Issue Editors

School of Materials Science and Engineering, East China Jiaotong University, Shuang Gang Dong Jie 808#, Economic and Technological Development Zone, Nanchang 330013, China
Interests: high-entropy alloys; high-entropy filler metals; multi-principal filler materials; dissimilar metal welding; laser welding; microstructure evolution; intermetallic compounds; mechanical properties; Ti/steel bimetallic sheet; Al/steel joints.
School of Materials Science and Engineering, East China Jiaotong University, Shuang Gang Dong Jie 808#, Economic and Technological Development Zone, Nanchang 330013, China
Interests: alloy; laser surface engineering; additive manufacturing

Special Issue Information

Dear Colleagues,

High-entropy alloys (HEAs) are defined as alloys with five or more principal elements. Each principal element has a concentration of 5~35 at.%. The multi-principal-element character of HEAs presents some important effects, including the high-entropy, sluggish diffusion, severe-lattice-distortion, and cocktail effects. These factors are much less pronounced in conventional alloys. Owing to the unique multi-principal-element composition, HEAs can possess special properties, including high strength/hardness, outstanding wear resistance, exceptional high-temperature strength, good structural stability, and good corrosion and oxidation resistance. Some of these properties are not observed in conventional alloys, making HEAs attractive in many fields, such as aerospace, nuclear energy, chemical plants, and marine vessels.

As the key processing methods, the additive manufacturing and welding technologies of high-entropy alloys have an impact on the future applications and technological developments of HEAs. The selection of feasible processes with optimized parameters is essential to enhance the applications of HEAs. However, the structure of HEAs varies with material systems, welding methods, and parameters. A systemic understanding of the structures and properties of the processed samples is directly relevant to the application of HEAs. Therefore, it is significantly meaningful to study in-depth the intrinsic relationship among the material systems, processing methods, process parameters, microstructure, and mechanical properties of HEAs during the additive manufacturing and welding processes.

The current Special Issue aims to explore the advanced additive manufacturing and welding technologies of HEAs and to study the basic principles of microstructure and property regulations. The articles presented in this Special Issue will address various topics, ranging from, but not limited to, the design of novel types of HEAs, the exploration of advanced welding technologies, the optimization of process parameters, microstructure regulation, and the performance improvement of HEAs.

Dr. Dejia Liu
Prof. Dr. Longzhi Zhao
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. Materials is an international peer-reviewed open access semimonthly 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 2300 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
  • welding
  • additive manufacturing
  • microstructure evolution
  • mechanical properties
  • filler metals
  • welding mechanism
  • joint performance

Published Papers (1 paper)

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Research

Article
Effects of Heat Treatment on the Interface Microstructure and Mechanical Properties of Friction-Stir-Processed AlCoCrFeNi/A356 Composites
Materials 2023, 16(6), 2234; https://doi.org/10.3390/ma16062234 - 10 Mar 2023
Viewed by 277
Abstract
Equiatomic AlCoCrFeNi high-entropy alloy (HEA) has gained significant interest in recent years because of its excellent mechanical properties. A356 aluminum alloy reinforced by AlCoCrFeNi HEA particles was fabricated by friction stir processing (FSP) and subsequent heat treatment. Solution and aging treatments were specially [...] Read more.
Equiatomic AlCoCrFeNi high-entropy alloy (HEA) has gained significant interest in recent years because of its excellent mechanical properties. A356 aluminum alloy reinforced by AlCoCrFeNi HEA particles was fabricated by friction stir processing (FSP) and subsequent heat treatment. Solution and aging treatments were specially performed for the composites to control the interface microstructure, and interfacial microstructure and tensile properties were explored at different conditions. The interface between the matrix and HEA particles showed a dual-layered core–shell structure and the thickness of the shell region increased with the solution time. The microstructure located in the shell layers consisted of a solid solution with increasing aluminum content, in which a radial-shaped solid solution phase formed in the region close to the core of the HEA particle and scattered solid solution grains with high Ni content formed in the region close to the matrix alloy. The gradient of composition and microstructure across the HEA/Al interface can be obtained through heat treatment, and an optimal interface bonding state and mechanical property were obtained after solution treatment for 2 h. Compared with FSPed A356 aluminum alloy, the FSPed composite enhanced the tensile stress by 60 MPa and the stain by 5% under the optimized conditions. The overgrowth of the shell layer decreased both the tensile strength and the ductile greatly due to the formation of a radial-shaped solid solution phase in the shell region. Full article
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

High-entropy alloys (HEAs) are defined as alloys with five or more principal elements. Each principal element has a concentration of 5~35 at.%. The multi-principal-element character of HEAs presents some important effects, including the high-entropy, sluggish diffusion, severe-lattice-distortion, and cocktail effects. These factors are much less pronounced in conventional alloys. Owing to the unique multi-principal-element composition, HEAs can possess special properties, including high strength/hardness, outstanding wear resistance, exceptional high-temperature strength, good structural stability, and good corrosion and oxidation resistance. Some of these properties are not observed in conventional alloys, making HEAs attractive in many fields, such as aerospace, nuclear energy, chemical plants, and marine vessels.

As the key processing methods, the additive manufacturing and welding technologies of high-entropy alloys have an impact on the future applications and technological developments of HEAs. The selection of feasible processes with optimized parameters is essential to enhance the applications of HEAs. However, the structure of HEAs varies with material systems, welding methods, and parameters. A systemic understanding of the structures and properties of the processed samples is directly relevant to the application of HEAs. Therefore, it is significantly meaningful to study in-depth the intrinsic relationship among the material systems, processing methods, process parameters, microstructure, and mechanical properties of HEAs during the additive manufacturing and welding processes.

The current Special Issue aims to explore the advanced additive manufacturing and welding technologies of HEAs and to study the basic principles of microstructure and property regulations. The articles presented in this Special Issue will address various topics, ranging from, but not limited to, the design of novel types of HEAs, the exploration of advanced welding technologies, the optimization of process parameters, microstructure regulation, and the performance improvement of HEAs.

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