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Intermetallics—Current Research and Applications
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Intermetallics—Current Research and Applications

A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: closed (15 September 2021) | Viewed by 8721

Special Issue Editor

Dr. Pawel Jozwik

E-Mail Website
Guest Editor
Military University of Technology, Warsaw, Poland
Interests: intermetallic alloys, nanostructured materials, cold work, microstructure characterization, recovery and recrystallisation process, catalytic activity, carbon nanofiber formation

Special Issue Information

Dear Colleagues,

The continuous development of civilization is limited by the availability of materials with specific and controlled properties. It is expected that in this group of future materials, the usefulness of alloys based on intermetallic phases will finally be confirmed. These materials have a relatively high melting point and high strength, but this unfortunately comes with insufficient ductility.

Although work on these materials started already in the previous century (mainly in the field of Ni–Al, Fe–Al, and Ti–Al balance systems), they are still seen as perspective materials. The indicated group is gradually expanded with new materials, for example, for the following systems: Mo–Si, Nb–Si, Ti–Si, Ni–Sn, Cu-Sn, Pt-Sn and Pt-Al.

Given the abovementioned special properties of these materials, their suitability in a wide range of practical applications is tested, including structural materials (in aerospace and automotive engines as well as in nuclear power plants) multifunctional materials (including MEMS and MECS elements), and functional materials (e.g., catalytically active systems in the field of chemical decomposition and combustion of harmful substances). There are also works aimed at improving the processing technology of intermetallic alloys, including additive manufacturing of construction elements with mass, porous or graded structure.

The aim of the current Special Issue is to collect the recent research and advances, particularly on microstructures and various types of properties of a wide range of intermetallics. Original research papers, state-of-the-art reviews, and discussions are welcome.

Dr. Pawel Jozwik
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

  • Intermetallic phases and alloys
  • Ductility of intermetallic alloys
  • Nano- and ultra-fine-grained intermetallics
  • Multifunctional intermetallic materials
  • Thermal stability of intermetallic structure and properties
  • Catalytic activity of intermetallic phases
  • Intermetallic materials fabricated by additive manufacturing methods
  • Applied research on intermetallics

Published Papers (4 papers)

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Research

19 pages, 68429 KiB  
Article
Analysis of the Morphology and Structure of Carbon Deposit Formed on the Surface of Ni3Al Foils as a Result of Thermocatalytic Decomposition of Ethanol
by Pawel Jóźwik, Agata Baran, Tomasz Płociński, Daniel Dziedzic, Jakub Nawała, Malwina Liszewska, Dariusz Zasada and Zbigniew Bojar
Materials 2021, 14(20), 6086; https://doi.org/10.3390/ma14206086 - 14 Oct 2021
Viewed by 1464
Abstract
This article presents the results of investigations of the morphology and structure of carbon deposit formed as a result of ethanol decomposition at 500 °C, 600 °C, and 700 °C without water vapour and with water vapour (0.35 and 1.1% by volume). scanning [...] Read more.
This article presents the results of investigations of the morphology and structure of carbon deposit formed as a result of ethanol decomposition at 500 °C, 600 °C, and 700 °C without water vapour and with water vapour (0.35 and 1.1% by volume). scanning electron microscopy (SEM) and scanning transmission electron microscopy (STEM) observations as well as energy dispersive X-ray spectrometry (EDS), X-ray diffraction (XRD), and Raman spectroscopic analyses allowed for a comprehensive characterization of the morphology and structure of cylindrical carbon nanostructures present on the surface of the Ni3Al catalyst. Depending on the reaction mixture composition (i.e., water vapour content) and decomposition temperature, various carbon nanotubes/carbon nanofibres (CNTs/CNFs) were observed: multiwalled carbon nanotubes, herringbone-type multiwall carbon nanotubes, cylindrical carbon nanofibers, platelet carbon nanofibers, and helical carbon nanotubes/nanofibres. The discussed carbon nanostructures exhibited nickel nanoparticles at the ends and in the middle part of the carbon nanostructures as catalytically active centres for efficient ethanol decomposition. Full article
(This article belongs to the Special Issue Intermetallics—Current Research and Applications)
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16 pages, 6127 KiB  
Article
Unexpected High Ductility of Fe40Al Alloys at Room Temperature
by Dariusz Siemiaszko and Iwona Garwacka
Materials 2021, 14(17), 4906; https://doi.org/10.3390/ma14174906 - 28 Aug 2021
Cited by 1 | Viewed by 1380
Abstract
Iron aluminium alloys, especially those sintered from elemental powders, suffer from low ductility. In this paper, an iron aluminium alloy (Fe40Al) produced by pressure-assisted induction sintering from elemental powders is shown and described. Samples produced by this method show an unexpectedly high ductility [...] Read more.
Iron aluminium alloys, especially those sintered from elemental powders, suffer from low ductility. In this paper, an iron aluminium alloy (Fe40Al) produced by pressure-assisted induction sintering from elemental powders is shown and described. Samples produced by this method show an unexpectedly high ductility in the compression test that is an order of magnitude higher than the literature values. Microstructural observations show plastic behaviour with significant deformation of the grains and a lack of decohesion. At the same time, the tensile properties of these samples remain at much lower levels. An attempt to explain this phenomenon is made and described in this paper. Full article
(This article belongs to the Special Issue Intermetallics—Current Research and Applications)
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14 pages, 3896 KiB  
Article
Direct Synthesis of Fe-Al Alloys from Elemental Powders Using Laser Engineered Net Shaping
by Magda Pęska, Krzysztof Karczewski, Magdalena Rzeszotarska and Marek Polański
Materials 2020, 13(3), 531; https://doi.org/10.3390/ma13030531 - 22 Jan 2020
Cited by 22 | Viewed by 3169
Abstract
The laser engineered net shaping (LENS®) process is shown here as an alternative to melting, casting, and powder metallurgy for manufacturing iron aluminides. This technique was found to allow for the production of FeAl and Fe3Al phases from mixtures of elemental [...] Read more.
The laser engineered net shaping (LENS®) process is shown here as an alternative to melting, casting, and powder metallurgy for manufacturing iron aluminides. This technique was found to allow for the production of FeAl and Fe3Al phases from mixtures of elemental iron and aluminum powders. The in situ synthesis reduces the manufacturing cost and enhances the manufacturing efficiency due to the control of the chemical and phase composition of the deposited layers. The research was carried out on samples with different chemical compositions that were deposited on the intermetallic substrates that were produced by powder metallurgy. The obtained samples with the desired phase composition illustrated that LENS® technology can be successfully applied to alloys synthesis. Full article
(This article belongs to the Special Issue Intermetallics—Current Research and Applications)
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10 pages, 8032 KiB  
Article
Microstructure of Coatings on Nickel and Steel Platelets Obtained by Co-Milling with NiAl and CrB2 Powders
by Maciej Szlezynger, Jerzy Morgiel, Łukasz Maj, Olena Poliarus and Paweł Czaja
Materials 2019, 12(16), 2593; https://doi.org/10.3390/ma12162593 - 15 Aug 2019
Cited by 2 | Viewed by 2021
Abstract
Metal matrix composite coatings are developed to protect parts made from materials susceptible to wear, like nickel alloys or stainless steel. The industry-established deposition method is presently an atmospheric plasma spraying method since it allows the production of both well-adhering and thick coatings. [...] Read more.
Metal matrix composite coatings are developed to protect parts made from materials susceptible to wear, like nickel alloys or stainless steel. The industry-established deposition method is presently an atmospheric plasma spraying method since it allows the production of both well-adhering and thick coatings. Alternatively, similar coatings could be produced by co-milling of ceramic and alloyed powders together with metallic plates serving as substrates. It results in mechanical embedding of the powder particles into exposed metallic surfaces required coatings. The present experiment was aimed at the analysis of microstructure of such coatings obtained using NiAl and CrB2 powders. They were loaded together with nickel and stainless steel platelets into ball mill vials and rotated at 350 rpm for up to 32 h. This helped to produce coatings of a thickness up to ~40 µm. The optical, scanning, and transmission electron microscopy observations of the coatings led to conclusion that the higher the rotation speed of vials, the wider the intermixing zone between the coating and the substrate. Simultaneously, it was established that the total thickness of the coating deposited at specified conditions is limited by the brittleness of its nanocrystalline matrix. An increase in the hardness of the substrate results in a decrease of the intermixing zone. The above results indicate that even as the method based on mechanical embedding could so far produce thinner coatings than the plasma spraying, in the former case they are characterized by a more uniform nanocrystalline matrix with homogenously distributed fine ceramic particles. Full article
(This article belongs to the Special Issue Intermetallics—Current Research and Applications)
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