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Crystals
Special Issues
Microstructure and Properties of Intermetallic Alloys
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Microstructure and Properties of Intermetallic Alloys

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystalline Metals and Alloys".

Deadline for manuscript submissions: closed (30 June 2023) | Viewed by 3338

Special Issue Editor

Dr. Anna Knaislova

E-Mail Website
Guest Editor
University of Chemistry and Technology in Prague; Faculty of Mechanical Engineering, Jan Evangelista Purkyně University in Ústí nad Labem in Ústí nad Labem, Ústí nad Labem, Czech Republic
Interests: intermetallic alloys; powder metallurgy; mechanical alloying; microscopy; titanium alloys; aluminium alloys
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Intermetallics are a special group of metallic materials whose properties allow their use under conditions in which conventional metallic materials fail; these conditions include high temperatures, aggressive corrosive environments, and extreme abrasive and adhesive stresses.

Many intermetallic compounds show very good physical and mechanical properties, specifically very good thermal stability, high melting points, good corrosion resistance, and low density, which makes them suitable candidates for high-temperature applications. However, these materials show limited ductility and higher brittleness, especially at low temperatures, which is an obstacle to their wider use.

The use of materials based on intermediate compounds is very diverse, but it is always necessary to consider the choice of a particular material in terms of its physical or mechanical properties. They are used, for example, as construction materials, shape memory materials (NiTi), heating elements of electric resistance furnaces (MoSi2), magnetic alloys (Ni3Fe), hydrogen storage materials (Mg2Ni, LaNi5) or high-temperature materials (TiAl, NiAl), or for strongly oxidizing environments (FeAl).

It is my great pleasure to invite all researchers from the community of researchers studying intermetallics to submit a manuscript in this field for this Special Issue “Microstructure and Properties of Intermetallic Alloys”. Full papers, communications, and reviews are all welcome.

Dr. Anna Knaislova
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. Crystals 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

  • intermetallic alloys
  • powder metallurgy
  • aluminides
  • properties
  • microstructure

Published Papers (3 papers)

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Research

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13 pages, 9854 KiB  
Article
Crystallization of Intermetallic Phases Fe2Si, Fe5Si3 for High Alloyed Cast Irons
by Marcin Stawarz
Crystals 2023, 13(7), 1033; https://doi.org/10.3390/cryst13071033 - 29 Jun 2023
Viewed by 821
Abstract
This paper presents the results of laboratory tests related to high-alloy silicon cast iron (HSCI). These materials are corrosion-resistant and commonly used in cathodic protection systems as protective electrodes. Due to their high fragility, alloys with increased Si content are not suitable for [...] Read more.
This paper presents the results of laboratory tests related to high-alloy silicon cast iron (HSCI). These materials are corrosion-resistant and commonly used in cathodic protection systems as protective electrodes. Due to their high fragility, alloys with increased Si content are not suitable for producing elements exposed to dynamic loads. This paper analyzes the crystallization process of silicon alloys (with Si content between 23% and 25%) using thermal and derivation analysis methods. The tests also included an extended analysis of chemical composition. The metallographic tests included scanning electron microscopy with an EDS system, and the phase composition was determined using X-ray diffraction. As a result of the tests, the warp components were identified, the primary share of which are intermetallic phases of the Fe5Si3 type. Moreover, single silicon crystals were found. The test results allowed for clarification of the temperature range of the transition of the Fe2Si phase into the Fe5Si3 phase and the determination of characteristic points of the crystallization process (TSolidus i TLiquidus). Furthermore, bifilm-type inclusions were identified in the alloys. We also managed to present the silicon crystals and Fe5Si3 phases in a spatial layout via observation of the surfaces of contraction cavities using scanning electron microscopy. Full article
(This article belongs to the Special Issue Microstructure and Properties of Intermetallic Alloys)
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10 pages, 2565 KiB  
Communication
Characterizations on Precipitations in the Cu-Rich Corner of Cu-Ni-Al Ternary Phase Diagram
by Yongxin Zhou, Chenyang Zheng, Jiankun Chen, Amin Chen, Lei Jia, Hui Xie and Zhenlin Lu
Crystals 2023, 13(2), 274; https://doi.org/10.3390/cryst13020274 - 04 Feb 2023
Cited by 1 | Viewed by 1304
Abstract
Three kinds of Cu-Ni-Al alloys, whose chemical compositions are located in the Cu-rich corner of the isothermal section of the Cu-Ni-Al ternary phase diagram, were prepared by melting and casting firstly, and then solution and aging treatments were carried out. The microstructure was [...] Read more.
Three kinds of Cu-Ni-Al alloys, whose chemical compositions are located in the Cu-rich corner of the isothermal section of the Cu-Ni-Al ternary phase diagram, were prepared by melting and casting firstly, and then solution and aging treatments were carried out. The microstructure was characterized and the competitive formation process of Ni-Al intermetallics were discussed. The results show that there are little amounts of NiAl phase at the grain boundary and needle- or particle-like Ni3Al phase inside the Cu matrix in all the as-cast alloys, although they are in the single-phase area. Solution and aging treatments mainly result in the disappearance and precipitation of Ni3Al phase, but the precipitations during aging are much smaller than those in the as-cast alloys. Thermodynamics and kinetics calculation indicate that the NiAl intermetallic wins out in the solidification process because of its lower change in Gibbs free energy, while Ni3Al phase is first to precipitate during aging due to its lower formation enthalpy and required Al concentration. The most important contribution of this work is that it proves that intermetallics can precipitate from the so-called single-phase zone in the Cu-rich corner of the Cu-Ni-Al phase diagram, which is the necessary prerequisite for the realization of high strength and high electrical conductivity. Full article
(This article belongs to the Special Issue Microstructure and Properties of Intermetallic Alloys)
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Review

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13 pages, 1635 KiB  
Review
Carbon–Carbon Composite Metallic Alloy Joints and Corresponding Nanoscale Interfaces, a Short Review: Challenges, Strategies, and Prospects
by Chenyu Wang, Yingguo Yang, Guangli Zeng, Xingtai Zhou, Hefei Huang and Shanglei Feng
Crystals 2023, 13(10), 1444; https://doi.org/10.3390/cryst13101444 - 28 Sep 2023
Viewed by 842
Abstract
Brazing of carbon–carbon (C/C) composites with metallic materials currently faces a series of difficulties, such as the poor wettability of metallic materials on the surface, the nanoscale interface bonding of C/C composites and metallic materials, thermal stress problems for these different materials, etc. [...] Read more.
Brazing of carbon–carbon (C/C) composites with metallic materials currently faces a series of difficulties, such as the poor wettability of metallic materials on the surface, the nanoscale interface bonding of C/C composites and metallic materials, thermal stress problems for these different materials, etc. Especially, the practical problems, including the low joint strength and insufficient reliability, still limit the large-scale practical application of brazing technology for C/C composites and metal materials. Herein, in order to guide the fabrication of high-quality joints, we present a brief discussion on the latest research progress in the joints of C/C composites and metallic materials, including current challenges, solution methods, mechanisms, and future prospects. More importantly, the nanoscale interface in the carbon–carbon composites and metallic alloys is paid very little attention, which has been critically discussed for the first time. Then, we further outline the possible solutions in joint problems of C/C composites and metallic materials, proposing feasible strategies to control the reaction in the brazing process, such as surface treatments, the addition of reinforcing phases, a transition layer sandwiched between the base material and the intermediate layer, etc. These strategies are being envisioned for the first time and further contribute to promoting the converged applications of C/C composites and metallic materials. Full article
(This article belongs to the Special Issue Microstructure and Properties of Intermetallic Alloys)
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