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Additive Manufacturing of Metals and Alloys: Recent Advances and Challenges (2nd Edition)

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

Deadline for manuscript submissions: 20 October 2025 | Viewed by 161

Special Issue Editors

School of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong, Wollongong, Australia
Interests: materials characterization; advanced manufacturing; composites design; micro manufacturing
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Guest Editor
School of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong, Wollongong, Australia
Interests: manufacturing engineering; materials engineering; composite materials; microforming
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Guest Editor
Welding and Additive Manufacturing Centre, Cranfield University, Bedford MK43 0AL, UK
Interests: shape memory alloys; in situ alloying; wire-based direct energy deposition; microstructure and mechanical analysis
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Guest Editor
Welding and Additive Manufacturing Centre, Cranfield University, Bedford, UK
Interests: additive manufacturing; material process and design
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Special Issue Information

Dear Colleagues,

Additive manufacturing (AM) is an important manufacturing strategy in Industry 4.0. Compared with traditional manufacturing and processing methods of metallic products, AM exhibits huge advantages in terms of more flexible geometrical shapes, higher efficiency, better performances, and less waste and carbon emission. The wide range of applicable materials provide potential areas where AM can flexibly realize stringent requirements of different fields and industries, such as vehicle, aero craft, space craft, marine engineering, nuclear power, medical treatment, and defence.

Nowadays, widely used AM techniques for preparing metals and alloys mainly include two types, direct energy deposition (DED) and powder bed fusion (PBF). Specific approaches of DED and PBF are diversified, involving laser melting deposition (LMD), laser-based metal wire deposition (LMWD), wire and arc additive manufacturing (WAAM), electron beam melting (EBM), selective laser melting (SLM), hybrid additive manufacturing (HAM), etc. The metals and alloys used in AM can be different according to the requirements of performances, and they might be steels, titanium (Ti) alloys, aluminum (Al) alloys, nickel (Ni) alloys, multiple principal element alloys (MPEAs), and metal matrix composites (MMCs).

This Special Issue aims to cover the latest progress in the field of additive manufacturing of metals and alloys, including the preparation process, microstructure characterization, properties evaluation, and advanced applications. Submissions of original research articles, reviews, and short communications related to the subject are welcome.

Dr. Fei Lin
Dr. Fanghui Jia
Dr. Jun Wang
Dr. Yao Lu
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 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

  • additive manufacturing
  • metals and alloys
  • materials design
  • microstructure characterization
  • mechanical properties
  • functional properties
  • manufacturing processes
  • preparation and application

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Published Papers (1 paper)

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Research

19 pages, 8699 KiB  
Article
Investigation of the Microstructural Evolution and Mechanical Properties of the AlCoCrFeNi2.1 EHEA Fabricated by Additive Manufacturing Assisted by Heat Treatment
by Xin Zhang, Wenxin Feng, Fanghui Jia, Wanhui Liu, Jian Wang, Lisong Zhu and Yangchuan Cai
Materials 2025, 18(10), 2330; https://doi.org/10.3390/ma18102330 - 16 May 2025
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Abstract
Eutectic high-entropy alloys (EHEAs) exhibit excellent casting properties and comprehensive mechanical performance, making them suitable for fabricating spatial engineering components using additive manufacturing techniques. However, the rapid solidification process also leads to increased internal stress and reduced structural stability in the components. Therefore, [...] Read more.
Eutectic high-entropy alloys (EHEAs) exhibit excellent casting properties and comprehensive mechanical performance, making them suitable for fabricating spatial engineering components using additive manufacturing techniques. However, the rapid solidification process also leads to increased internal stress and reduced structural stability in the components. Therefore, this study focuses on the AlFeCoCrNi2.1 EHEA as the research subject, utilizing laser additive manufacturing to fabricate components and systematically investigating the influence of heat treatment processes on the microstructure and mechanical properties of the components. The research demonstrates that low-temperature heat treatment (700 °C and below) acts as a stress relief-annealing process for the components. The yield strength decreased from 1003.2 MPa to 742.1 MPa. At 900 °C heat treatment, the constraining effect between recrystallized grains and surrounding grains outweighs the dislocation release effect caused by recrystallization, resulting in an increase in dislocation density. The yield strength remained approximately stable at around 730 MPa. High-temperature heat treatment (1100 °C) alters the orientation of phase structures and fragments the two-phase structure through recrystallization, leading to generally stable mechanical properties of the components. The yield strength of the cast components further decreased to 582.6 MPa, while that of the LMD-fabricated parts retained stability at approximately 730 MPa. Full article
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