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Metals
Special Issues
Heterogeneities in Metallic Glasses
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Heterogeneities in Metallic Glasses

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

Deadline for manuscript submissions: closed (31 May 2021) | Viewed by 7818

Special Issue Editors

Dr. Christoph Gammer

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Guest Editor
Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben, Austria
Interests: metallic glasses; nanocrystalline alloys; transmission electron microscopy; in situ deformation
Special Issues, Collections and Topics in MDPI journals
Dr. Sergey Ketov

E-Mail Website
Guest Editor
Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben, Austria
Interests: structure and properties of metallic glasses; hard magnetic materials
Prof. Jürgen Eckert

E-Mail Website
Guest Editor
Erich Schmid Institute of Materials Science, Austrian Academy of Sciences and Department of Materials Science, Montanuniversität Leoben, Leoben, Austria
Interests: metallic glasses and composites; complex materials; biocompatible and functional materials

Special Issue Information

Dear Colleagues,

Research on metallic glasses started in 1960 after Duwez et al. demonstrated, for the first time, the formation of an Au–Si metallic glass ribbon. In the end of the 1980s and the beginning of the 1990s, the topic gained popularity due to the development of bulk metallic glasses of several millimeters in diameter. Many theories explaining the structure and properties of metallic glasses have since then been developed. Still, only recently did it become possible to directly look at the structure at the atomic level and test properties on nanometer scales. This has demonstrated that the structure of metallic glasses is not homogeneous at this level. Moreover, it has been shown that most of the properties of metallic glasses stem from heterogeneous structures. Therefore, a lot of research is dedicated towards tailored heterogeneous metallic glasses, including glasses with crystalline inclusions and glasses with chemical or structural heterogeneities.

We want to dedicate this Special Issue to the investigations of the heterogeneous structure of metallic glasses and their influence on mechanical or functional properties. The Special Issue welcomes original research papers and reviews on the production of metallic glasses containing heterogeneities, their structural analysis with advanced experimental techniques, and on computer simulations targeted at the atomic configuration and the effect of heterogeneities.

Dr. Christoph Gammer
Dr. Sergey Ketov
Prof. Jürgen Eckert
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 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

  • Metallic Glass
  • Composites
  • Structure
  • Properties
  • Heterogeneities
  • Rejuvenation
  • Transmission Electron Microscopy

Published Papers (3 papers)

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Research

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14 pages, 13870 KiB  
Article
Influence of High-Pressure Torsion and Accumulative High-Pressure Torsion on Microstructure and Properties of Zr-Based Bulk Metallic Glass Vit105
by Dmitry Gunderov, Vasily Astanin, Anna Churakova, Vil Sitdikov, Evgeniy Ubyivovk, Akhmed Islamov and Jing Tao Wang
Metals 2020, 10(11), 1433; https://doi.org/10.3390/met10111433 - 28 Oct 2020
Cited by 12 | Viewed by 2045
Abstract
Vit105 (Zr52.5Cu17.9Ni14.6Al10Ti5 at. %) bulk metallic glass samples were processed by high-pressure torsion and accumulative high-pressure torsion. By DSC, XRD and SANS methods it was shown that accumulative high-pressure torsion allows for achieving high [...] Read more.
Vit105 (Zr52.5Cu17.9Ni14.6Al10Ti5 at. %) bulk metallic glass samples were processed by high-pressure torsion and accumulative high-pressure torsion. By DSC, XRD and SANS methods it was shown that accumulative high-pressure torsion allows for achieving high real strains and leads to an increase in the free volume and significant transformation of the structure. Minor crystallization was detected after high-pressure torsion processing. Full article
(This article belongs to the Special Issue Heterogeneities in Metallic Glasses)
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11 pages, 5857 KiB  
Article
Structural and Phase Evolution upon Annealing of Fe76Si9−xB10P5Mox (x = 0, 1, 2 and 3) Alloys
by Darling Perea, Carolina Parra, Parthiban Ramasamy, Mihai Stoica, Jürgen Eckert, Francisco Bolívar and Félix Echeverría
Metals 2020, 10(7), 881; https://doi.org/10.3390/met10070881 - 2 Jul 2020
Cited by 4 | Viewed by 1886
Abstract
Alloying elements play an important role in adjusting the magnetic and thermal properties of Fe-based amorphous alloys. In this work, the effect of Mo addition on the thermal stability, structural evolution, and magnetic properties of Fe76Si9B10P5 [...] Read more.
Alloying elements play an important role in adjusting the magnetic and thermal properties of Fe-based amorphous alloys. In this work, the effect of Mo addition on the thermal stability, structural evolution, and magnetic properties of Fe76Si9B10P5 metallic glass was studied. The study revealed that the substitution of a small amount of Mo (1 at.%) for Si enhances the glass-forming ability (GFA) but reduces the thermal stability of the alloy, causing a reduction of the supercooled liquid region. Substitution of up to 3 at.% Mo for Si lowers the Curie temperature from 677 to 550 K and the saturation magnetization drops from 160 to 138 Am2/kg. The structural evolution was evaluated by annealing the glassy samples at different temperatures, revealing that the crystallization proceeds in multiple steps, beginning with the formation of different iron borides (FeB, Fe2B, FeB2 and Fe23B6) followed by transformation to a mixture of more stable phases. Full article
(This article belongs to the Special Issue Heterogeneities in Metallic Glasses)
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Review

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46 pages, 14707 KiB  
Review
Cluster-Related Phenomena in the Properties and Transformations of Transition Metal-Based Glassy Alloys
by Antal Lovas, Parthiban Ramasamy, Attila Szabó, Jozef Kováč, Ladislav Novák and Jürgen Eckert
Metals 2020, 10(8), 1025; https://doi.org/10.3390/met10081025 - 31 Jul 2020
Cited by 1 | Viewed by 3329
Abstract
A survey of the cluster formation tendency and mechanism in transition metal-based glassy alloys is made with an emphasis on their manifestation in various physical properties. The cluster formation is partially inherited from the supercooling of the melt. However, it also develops due [...] Read more.
A survey of the cluster formation tendency and mechanism in transition metal-based glassy alloys is made with an emphasis on their manifestation in various physical properties. The cluster formation is partially inherited from the supercooling of the melt. However, it also develops due to the interaction between dissolved hydrogen and the frozen glassy structure. The glassy state as “cluster assembly” is regarded as a structural background for the interpretation of several anomalous concentration dependences of thermal and magnetic properties in these glasses. We will focus on the manifestation of alloying effects, the relation between irreversible and reversible structural relaxations both in the high, and low temperature range (observed near to the glass transition or after low temperature storage). The development of the cluster assembly is the consequence of the co-existence of various bonding types between the alloy components. These are brought together in the melt, ensuring sufficient glass-forming ability. The nucleation mechanism of the amorphous-nanocrystalline transformation is also explained as a cluster phenomenon, which significantly contributes to the evolution of magnetic ultra-softness in FINEMET-type alloys. Finally, the role of the quenched-in cluster structure in the mechanism of reversible and irreversible H-absorption is discussed. Irreversible H-induced structural rearrangements can appear as microphase separation in multicomponent systems, governed by the affinity difference between the metallic components and the absorbed hydrogen. This kind of H-induced reordering is responsible for the “volume activation” of amorphous H-storage alloys and it also causes the gradual breakdown of storage capacity during cyclic absorption–desorption steps. This article mainly focuses on the cluster phenomena in Fe-based glasses because of its unique combination of high mechanical strength, strong corrosion resistance, good thermal stability and excellent magnetic properties. Full article
(This article belongs to the Special Issue Heterogeneities in Metallic Glasses)
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