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Thermomechanical Processing and Additive Manufacturing of Metal Alloys

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

Deadline for manuscript submissions: 20 July 2024 | Viewed by 631

Special Issue Editor


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Guest Editor
School of Materials Science & Engineering, UNSW Sydney, Sydney, NSW 2052, Australia
Interests: physical metallurgy; additive manufacturing; Ti-alloys; phase transformation; interfaces; grain boundaries; microstructure

Special Issue Information

Dear Colleagues,

Metal additive manufacturing (AM) has transformed the field of engineering by offering unparalleled flexibility in fabricating complex components using a wide range of metals and alloys with minimum waste and short lead times. Nevertheless, other enquiries persist, such as how the specific characteristics of metal additive manufacturing (AM) components are attained and, in connection, whether and how they might be intentionally devised. Acquiring this type of expertise is essential for enhancing the performance of AM parts, which is a crucial requirement for enabling their use in new and challenging applications. Conversely, the prevailing body of physical metallurgy textbook knowledge focuses on microstructural evolution under the assumption of equilibrium conditions. However, this assumption frequently proves to be incorrect in the context of AM, necessitating a reconsideration of this knowledge within the framework of AM. To uncover local processing–structure–property relationships, one area of emphasis in methodological research has been the advancement of microstructural analyses, facilitated by recent developments in characterization techniques that enable the acquisition of large three-dimensional structural datasets. This provides an outstanding opportunity for intentional microstructural manipulation to enhance the mechanical performance and overall functionality of AM builds.

The Special Issue, titled "Thermomechanical Processing and Additive Manufacturing of Metal Alloys", is dedicated to publishing studies focused on the in-depth exploration of the additive manufacturing process applied to metallic materials, with a specific focus on investigating the microstructure and mechanical properties of the resulting materials. We extend an invitation to you to participate in this Special Issue by submitting papers that explore the strategic design of microstructures and defects, multi-scale materials characterization, in situ monitoring of AM processes, and a re-evaluation of physical metallurgy to develop the desired mechanical properties in manufactured products for various industrial applications.

Dr. Ehsan Farabi
Guest Editor

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

  • metal additive manufacturing
  • fusion and solid-state metal additive manufacturing
  • wire and powder-based additive manufacturing
  • microstructure
  • mechanical properties
  • alloys
  • advanced materials design

Published Papers (1 paper)

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Research

17 pages, 3811 KiB  
Article
The Effects of Heat Treatment on the Microstructure and Mechanical Properties of a Selective Laser Melted AlCoFeNi Medium-Entropy Alloy
by Xinyang Han, Xiangwei Li, Bokai Liao, Youzhao Zhang, Lei Xu, Xingpeng Guo and Shuyan Zhang
Materials 2024, 17(7), 1582; https://doi.org/10.3390/ma17071582 - 29 Mar 2024
Viewed by 403
Abstract
A single body-centered cubic (BCC)-structured AlCoFeNi medium-entropy alloy (MEA) was prepared by the selective laser melting (SLM) technique. The hardness of the as-built sample was around 32.5 HRC. The ultimate tensile strength (UTS) was around 1211 MPa, the yield strength (YS) was around [...] Read more.
A single body-centered cubic (BCC)-structured AlCoFeNi medium-entropy alloy (MEA) was prepared by the selective laser melting (SLM) technique. The hardness of the as-built sample was around 32.5 HRC. The ultimate tensile strength (UTS) was around 1211 MPa, the yield strength (YS) was around 1023 MPa, and the elongation (El) was around 10.8%. A novel BCC + B2 + face-centered cubic (FCC) structure was formed after aging. With an increase in aging temperature and duration, the number of fine grains increased, and more precipitates were observed. After aging at 450 °C for 4 h, the formed complex polyphase structure significantly improved the mechanical properties. Its hardness, UTS, YS, and El were around 45.7 HRC, 1535 MPa, 1489 MPa, and 8.5%, respectively. The improvement in mechanical properties was mainly due to Hall–Petch strengthening, which was caused by fine grains, and precipitation strengthening, which was caused by an increase in precipitates after aging. Meanwhile, the FCC precipitates made the alloy have good toughness. The complex interaction of multiple strengthening mechanisms leads to a good combination of strength, hardness, and toughness. Full article
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