Advances in Additive Manufacturing for Metallic Materials and Their Applications (4th Edition)

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Additive Manufacturing".

Deadline for manuscript submissions: 25 November 2026 | Viewed by 1412

Special Issue Editors


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Guest Editor
Department of Manufacturing Engineering, Technical University of Cluj-Napoca, 400114 Cluj-Napoca, Romania
Interests: additive manufacturing and their applications; rapid tooling; CNC manufacturing
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Guest Editor

Special Issue Information

Dear Colleagues,

Additive manufacturing (AM) is a new type of manufacturing engineering with a less than 35-year history. The real value of additive manufacturing is in identifying the applications where reductions in lead time, manufacturing cost, weight, tooling, and so on can lead to huge benefits across a part’s lifecycle in many applications, from industry to medicine.

Additive manufacturing has evolved rapidly in the last few years. It has been embraced by major industrial companies looking for ways to improve their products. The ability to deliver near-instant part production and fully custom designs that cannot be replicated with other manufacturing techniques has accelerated investment and research in additive engineering.

A number of different metals are now available in powdered form to suit exact processes and requirements. Titanium, steel, stainless steel, aluminum, and copper-, cobalt-chrome-, titanium- and nickel-based alloys are available in powdered form, as are precious metals such as gold, platinum, palladium, and silver.

This Special Issue will cover fundamental studies of additive manufacturing process, optimizations, new additive processes, rapid tooling, and applications from industry to medicine using metal powders as raw materials.

I hope that the present Special Issue will be an opportunity for creating a strong network between authors and users, working in some different sectors, for smart applications from industry to medicine.

Prof. Dr. Petru Berce
Prof. Dr. Rǎzvan Pǎcurar
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 250 words) can be sent to the Editorial Office for assessment.

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

  • additive manufacturing process
  • optimization of AM process
  • rapid tooling
  • industrial applications
  • medical applications

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Published Papers (2 papers)

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Research

21 pages, 10860 KB  
Article
The Effect of Build Orientation and Heat Treatment on Properties of Molten Metal Jetted AlSi7Mg Aluminum Alloy
by Usama Abdullah Rifat, Khushbu Zope, Paarth Mehta, Valeria Marin-Montealegre and Denis Cormier
Metals 2026, 16(4), 363; https://doi.org/10.3390/met16040363 - 25 Mar 2026
Viewed by 398
Abstract
Molten Metal Jetting (MMJ) is an emerging metal additive manufacturing process that produces components via on-demand jetting of discrete droplets. This paper reports properties of T6 heat-treated AlSi7Mg alloy produced in different build orientations via MMJ. A Xerox ElemX machine was used to [...] Read more.
Molten Metal Jetting (MMJ) is an emerging metal additive manufacturing process that produces components via on-demand jetting of discrete droplets. This paper reports properties of T6 heat-treated AlSi7Mg alloy produced in different build orientations via MMJ. A Xerox ElemX machine was used to print AlSi7Mg coupons in horizontal, tilted, and vertical orientations. The aluminum feedstock was melted at 825 °C and was printed onto a 475 °C heated print bed using a jetting frequency of 400 Hz and a drop spacing of 500 μm. Coupons were heat treated to a T6 temper. The average yield strengths of heat-treated coupons in vertical and horizontal orientations were 240.4 ± 7.3 MPa and 244.6 ± 7.1 MPa respectively. This indicates that the vertical build orientation had minimal adverse effect on strength. However, average strain (11.5% ± 1.2% versus 14.6% ± 3.5%) values for the vertical and horizontal orientations, respectively, showed more pronounced effects. X-ray CT analysis of vertically oriented coupons revealed increases in porosity in material deposited above heights of ~90 mm. Above this build height, the measured surface temperature dropped below ~455 °C. External heating methods are therefore advised in order to maintain a surface temperature ≥ 455 ° and avoid excess porosity. Full article
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18 pages, 8446 KB  
Article
Influence of Post-Processing Temperatures on Microstructure and Hardness of PBF-LB Ti-6Al-4V
by Trung Van Trinh, Trang Huyen Dang, Anh Hoang Pham, Gia Khanh Pham and Ulrich E. Klotz
Metals 2026, 16(1), 121; https://doi.org/10.3390/met16010121 - 20 Jan 2026
Viewed by 572
Abstract
This study investigates the effects of post-build heat treatments—such as annealing, quenching, and aging—on the microstructure and hardness of Laser Powder Bed Fusion (PBF-LB) Ti-6Al-4V. Specimens were subjected to annealing (950 °C, 1010 °C) or solution treatment/quenching (950 °C, 1010 °C), followed by [...] Read more.
This study investigates the effects of post-build heat treatments—such as annealing, quenching, and aging—on the microstructure and hardness of Laser Powder Bed Fusion (PBF-LB) Ti-6Al-4V. Specimens were subjected to annealing (950 °C, 1010 °C) or solution treatment/quenching (950 °C, 1010 °C), followed by aging (350–550 °C). Microstructural evolution was analyzed using optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), electron backscatter diffraction (EBSD), and Vickers hardness testing. Results showed that the as-built sample exhibited high hardness (365.2 HV0.1) due to fine α′ martensite. Sub-β-transus annealing at 950 °C decomposed α′ into equilibrium α + 1.25% β (329 HV0.1), while super-β-transus annealing at 1010 °C formed coarse lamellar structures of α + 1.5% β, yielding the lowest hardness (319 HV0.1). Quenching from 1010 °C produced dominant α′ martensite with high hardness (371.6 HV0.1). Notably, aging samples quenched from 950 °C increased hardness, peaking at 382.6 HV0.1 at 450 °C due to precipitation, before decreasing to 364.4 HV0.1 at 550 °C due to coarsening. These findings demonstrate that optimizing heat treatment temperatures is critical for controlling phase transformations and tailoring mechanical properties in additively manufactured Ti-6Al-4V components. Full article
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