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Microstructure Characterization and Properties of Intermetallic Alloys/Amorphous Alloys
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Microstructure Characterization and Properties of Intermetallic Alloys/Amorphous Alloys

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

Deadline for manuscript submissions: closed (20 April 2025) | Viewed by 1653

Special Issue Editor

Dr. Joanna Czub

E-Mail Website
Guest Editor
Faculty of Physics and Applied Computer Science, AGH University of Krakow, Mickiewicza 30, 30-059, Krakow, Poland
Interests: solid-state physics; materials physics; nanomaterials; hydrogen-storage materials; amorphous alloys; quasicrystalline alloys

Special Issue Information

Dear Colleagues,

Satisfying the constantly and rapidly growing need for novel materials with possible industrial applications is one of the most important challenges for science today. In particular, intermetallic compounds, which are solid phases involving two or more metallic elements whose crystal structure is different from that of their constituents, have recently been of interest due to their unique chemical, magnetic, and superconducting properties as well as their increased strength. Moreover, amorphous alloys have sparked substantial interest because of their possible applications for shape-memory alloys and coatings as materials for biotechnology and hydrogen storage.

Special Issue welcomes contributions focused on the characterization of the microstructural of the intermetallics and the amorphous alloys.

Dr. Joanna Czub
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

  • microstructure
  • characterization
  • microstructural properties
  • intermetallics
  • intermetallic alloys
  • amorphous alloys
  • nanomaterials

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Published Papers (3 papers)

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Research

11 pages, 4295 KiB  
Article
Relaxation and Devitrification of Mg66Zn30Ca4 Metallic Glass
by Karel Saksl, Juraj Ďurišin, Martin Fujda, Zuzana Molčanová, Beáta Ballóková, Miloš Matvija and Katarína Gáborová
Materials 2025, 18(11), 2464; https://doi.org/10.3390/ma18112464 (registering DOI) - 24 May 2025
Abstract
Mg66Zn30Ca4 metallic glass is a promising biodegradable material due to its high strength, corrosion resistance, and excellent glass-forming ability. In this study, we investigated its thermal stability, structural relaxation, and crystallization behavior using high-energy synchrotron-based X-ray diffraction and [...] Read more.
Mg66Zn30Ca4 metallic glass is a promising biodegradable material due to its high strength, corrosion resistance, and excellent glass-forming ability. In this study, we investigated its thermal stability, structural relaxation, and crystallization behavior using high-energy synchrotron-based X-ray diffraction and DSC analysis. The glass exhibits a wide supercooled liquid region of 58 K, allowing for thermoplastic forming. Structural relaxation experiments revealed nearly a complete relaxation in the first cycle below the first crystallization peak. Upon heating, the alloy undergoes a complex, multi-step devitrification involving successive formation of crystalline phases: Mg51Zn20 (orthorhombic), Mg (hexagonal), and a Ca–Mg–Zn intermetallic compound Ca8Mg26.1Zn57.9, denoted as IM3. Phase identification was carried out by Rietveld refinement, and the evolution of lattice parameters demonstrated anisotropic thermal expansion, particularly in the Mg51Zn20 phase. Notably, the presence of the IM1 Ca3MgxZn15−x, with the 4.6 ≤ x ≤ 12 phase reported in earlier studies, was not confirmed. This work deepens the understanding of phase stability and crystallization mechanisms in Mg-based metallic glasses and supports their future application in biodegradable implants. Full article
(This article belongs to the Special Issue Microstructure Characterization and Properties of Intermetallic Alloys/Amorphous Alloys)
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15 pages, 831 KiB  
Article
Microstructure and Thermophysical Characterization of Tetra-Arsenic Biselenide As4Se2 Alloy Nanostructured by Mechanical Milling
by Oleh Shpotyuk, Andrzej Kozdras, Yaroslav Shpotyuk, Guang Yang and Zdenka Lukáčová Bujňáková
Materials 2025, 18(11), 2422; https://doi.org/10.3390/ma18112422 - 22 May 2025
Viewed by 135
Abstract
Nanomilling-driven effects on polyamorphic transitions are examined in tetra-arsenic biselenide As4Se2 alloy, which is at the boundary of the glass-forming region in the As-Se system, using multifrequency temperature-modulated DSC-TOPEM® technique, supported by X-ray powder diffraction (XRPD) and micro-Raman spectroscopy [...] Read more.
Nanomilling-driven effects on polyamorphic transitions are examined in tetra-arsenic biselenide As4Se2 alloy, which is at the boundary of the glass-forming region in the As-Se system, using multifrequency temperature-modulated DSC-TOPEM® technique, supported by X-ray powder diffraction (XRPD) and micro-Raman spectroscopy analysis. As shown by XRPD analysis, this alloy reveals a glassy–crystalline nature due to rhombohedral As and cubic As2O3 (arsenolite) inclusions, which especially grew after milling in a PVP (polyvinylpyrrolidone) water solution. At the medium-range structure level, nanomilling-driven changes are revealed as the disruption of intermediate-range ordering and enhancement of extended-range ordering. The generalized molecular-to-network amorphization trend in this alloy is confirmed by the microstructure response revealed in the broadened and obscured features in micro-Raman scattering spectra collected for nanomilled specimens. Thermophysical heat-transfer phenomena are defined by molecular-to-network polyamorphic transformations activated under nanomilling. The domination of thioarsenide-type As4Sen entities in this alloy results in an abnormous nanomilling-driven network-enhanced glass transition temperature increase. The nanomilled alloys become notably stressed owing to the destruction of molecular thioarsenide and incorporation of their remnants into the newly polymerized arsenoselenide network. This effect is more pronounced in As4Se2 alloy subjected to dry nanomilling, while it is partly counterbalanced when this alloy is additionally subjected to wet milling in a PVP water solution, accompanied by the stabilization of the As4Se2/PVP nanocomposite. Full article
(This article belongs to the Special Issue Microstructure Characterization and Properties of Intermetallic Alloys/Amorphous Alloys)
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Graphical abstract

13 pages, 7200 KiB  
Article
Hydrogenation Properties of the Ti45Zr38−xYxNi17 (5 ≤ x ≤ 10) and the Ti45−zYzZr38Ni17 (5 ≤ z ≤ 15) Mechanically Alloyed Materials
by Joanna Czub, Akito Takasaki, Andreas Hoser, Manfred Reehuis and Łukasz Gondek
Materials 2024, 17(20), 4946; https://doi.org/10.3390/ma17204946 - 10 Oct 2024
Viewed by 895
Abstract
The amorphous materials of the Ti45Zr38Ni17 composition synthesized by mechanical alloying are widely recognized for their ability to store hydrogen with gravimetric densities above 2 wt.%. It is also known that those alloys can form a quasicrystalline state [...] Read more.
The amorphous materials of the Ti45Zr38Ni17 composition synthesized by mechanical alloying are widely recognized for their ability to store hydrogen with gravimetric densities above 2 wt.%. It is also known that those alloys can form a quasicrystalline state after thermal treatment and their structural and hydrogen sorption properties can be altered by doping with various elements. Therefore, in this paper, the results of the studies on the Ti45Zr38Ni17 system with yttrium substituted for titanium and zirconium are presented. We demonstrate that these alloys are able to absorb hydrogen with a concentration of up to 2.7 wt.% while retaining their amorphous structure and they transform into the unique glassy-quasicrystal phase upon annealing. Furthermore, we demonstrate that the in-situ hydrogenation of those new materials is an effortless procedure in which the decomposition of the alloy can be avoided. Moreover, we prove that, in that process, hydrogen does not bind to any specific component of the alloy, which would otherwise cause the formation of simple hydrides or nanoclusters. Full article
(This article belongs to the Special Issue Microstructure Characterization and Properties of Intermetallic Alloys/Amorphous Alloys)
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