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Metals
Special Issues
Spark Plasma Sintering on Metals and Alloys
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Spark Plasma Sintering on Metals and Alloys

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: closed (30 November 2021) | Viewed by 4783

Special Issue Editor

Dr. Pasquale Daniele Cavaliere

E-Mail Website
Guest Editor
Department of Innovation Engineering University of Salento, Lecce 73100, Italy
Interests: metal forming; powder metallurgy; coatings; high entropy alloys
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

We are pleased to invite you to participate in the Special Issue “Spark Plasma Sintering of Metals and Alloys” by submitting an article on a related topic in which you are a recognized authority. I will serve as Editor of this Special Issue. The Special Issue will be published by MDPI in the journal Metals.

The articles topics of the Special Issue include but are not limited to:

- Spark Plasma Sintering—Process Fundamentals

- Spark Plasma Sintering of Al-Based Materials

- Spark Plasma Sintering of Mg-Based Materials

- Spark Plasma Sintering of Cu-Based Materials

- Spark Plasma Sintering of Ti-Based Materials

- Spark Plasma Sintering of Metallic Glass Materials

- Spark Plasma Sintering of Fe-Based Materials

- Spark Plasma Sintering of Ni-Based Materials

- Spark Plasma Sintering of W-Based Materials

- Spark Plasma Sintering of High Entropy Alloys

- Spark Plasma Sintering of High Temperature Materials

Spark plasma sintering (SPS) is a sintering technique utilizing uniaxial force and a pulsed direct current to perform metallic or ceramic particles consolidation within very short times. The high heating and cooling rates prevent excessive grain growth, favoring densification. In recent times, spark plasma sintering has been recognized as a very useful method for producing complex alloys and metal matrix composites with enhanced mechanical and wear properties. The final material properties are strongly related to the reinforcement types and percentages as well as to the processing parameters employed during synthesis. First of all, material density and hardness depend on the heating and pressure conditions employed during sintering. The addition of reinforcing phases modifies the potential process parameters that can be employed during sintering and, of course, the final material properties. These are a direct function of different factors such as type, size, and percentage. The technological advantages include fast sintering processes, uniform microstructure and properties, reduced grain growth, achieving compaction and sintering in one processing step, processing of different materials, and high energy efficiency. The potential applications of SPS-treated components are very broad, covering such fields as space and aeronautics, automation, mechanical engineering, and biomedicine.

We would be very pleased to receive your contributions and are looking forward to hearing from you.

Dr. Pasquale Cavaliere
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. 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

  • spark plasma sintering
  • field-assisted sintering
  • nanostructuring
  • mechanical properties
  • microstructural evolution
  • wear
  • fatigue
  • nanoindentation

Published Papers (2 papers)

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Research

14 pages, 15588 KiB  
Article
Influence of Dwell Time and Pressure on SPS Process with Titanium Aluminides
by Bernd-Arno Behrens, Kai Brunotte, Julius Peddinghaus and Adrian Heymann
Metals 2022, 12(1), 83; https://doi.org/10.3390/met12010083 - 04 Jan 2022
Cited by 7 | Viewed by 1585
Abstract
Spark plasma sintering (SPS) or the field-assisted sintering technique (FAST) is commonly used to process powders that are difficult to consolidate, more efficiently than in the conventional powder metallurgy process route. During the process, holding time and applied holding pressure influence the product’s [...] Read more.
Spark plasma sintering (SPS) or the field-assisted sintering technique (FAST) is commonly used to process powders that are difficult to consolidate, more efficiently than in the conventional powder metallurgy process route. During the process, holding time and applied holding pressure influence the product’s microstructure and subsequently its properties. In this study, in addition to the temperature impact, the influence of pressure and dwell time on the consolidation behaviour of titanium aluminide (TiAl) powders during the SPS process is investigated. Commercially available pre-alloyed TiAl48-2Cr-2Nb (GE48) and TiAl44-4Nb-0.7Mo-0.1B (TNM) powders were used, which have a high application potential in, for example, the aerospace industry. The results were evaluated based on microstructural analyses, hardness measurements and relative density calculations. It was shown that the investigated parameters significantly influence the sintering results, especially in the low temperature range. Depending on the temperature field in the sample, complete sintering is not achieved if the dwell time is too short in combination with too low a pressure. Above a certain temperature, the impact of holding pressure and holding time is significantly lower. Full article
(This article belongs to the Special Issue Spark Plasma Sintering on Metals and Alloys)
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14 pages, 7242 KiB  
Article
Effects of Process Control Agent Amount, Milling Time, and Annealing Heat Treatment on the Microstructure of AlCrCuFeNi High-Entropy Alloy Synthesized through Mechanical Alloying
by Negar Yazdani, Mohammad Reza Toroghinejad, Ali Shabani and Pasquale Cavaliere
Metals 2021, 11(9), 1493; https://doi.org/10.3390/met11091493 - 20 Sep 2021
Cited by 26 | Viewed by 2438
Abstract
This study was conducted to investigate the characteristics of the AlCrCuFeNi high-entropy alloy (HEA) synthesized through mechanical alloying (MA). In addition, effects of Process Control Agent (PCA) amount and milling time were investigated using X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), and [...] Read more.
This study was conducted to investigate the characteristics of the AlCrCuFeNi high-entropy alloy (HEA) synthesized through mechanical alloying (MA). In addition, effects of Process Control Agent (PCA) amount and milling time were investigated using X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS). The results indicated that the synthesized AlCrCuFeNi alloy is a dual phase (FCC + BCC) HEA and the formation of the phases is strongly affected by the PCA amount. A high amount of PCA postponed the alloying process and prevented solid solution formation. Furthermore, with an increase in the PCA amount, lattice strain decreased, crystallite size increased, and the morphology of the mechanically alloyed particles changed from spherical to a plate-like shape. Additionally, investigation of thermal properties and annealing behavior at different temperatures revealed no phase transformation up to 400 °C; however, the amount of the phases changed. By increasing the temperature to 600 °C, a sigma phase (σ) and a B2-ordered solid solution formed; moreover, at 800 °C, the FCC phase decomposed into two different FCC phases. Full article
(This article belongs to the Special Issue Spark Plasma Sintering on Metals and Alloys)
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