Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
4.4
2.9
Journals
Metals
Special Issues
Research on Metallic Glasses
share announcement

Research on Metallic Glasses

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

Deadline for manuscript submissions: closed (31 October 2022) | Viewed by 8319

Special Issue Editor

Prof. Dr. Vitaly A. Khonik

E-Mail Website
Guest Editor
Department of General Physics, Voronezh State Pedagogical University, Lenin St. 86, Voronezh 394043, Russia
Interests: metallic glasses; glass transition; relaxation phenomena; defects; elasticity; anelasticity; viscoelasticity; heat effects; rejuvenation; melting of crystals, point defects in crystals
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Research into metallic glasses has been ongoing for decades; however, they are still a major focus of world physics and the material science community. Although many scientific issues have already been addressed, several unresolved problems remain, related to glass formation, glass transition, structure, structural dynamics, structural defects, etc.

It is expected that this Special Issue of Metals will present valuable contributions to the major topics of research on metallic glasses. Experimental, theoretical, and computational studies on structure and structural dynamics, different types of relaxation, elasticity and anelasticity, plastic deformation, rejuvenation, strength, as well as works on application issues are welcome. 

Prof. Dr. Vitaly A. Khonik
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

  • metallic glasses
  • structure
  • defects
  • relaxation
  • elasticity
  • inelastic deformation
  • rejuvenation

Published Papers (5 papers)

Download All Papers
Order results
Result details
Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:

Research

10 pages, 519 KiB  
Article
Components of the Shear Modulus and Their Dependence on Temperature and Plastic Deformation of a Metallic Glass
by Andrei Makarov, Marina Kretova, Gennadii Afonin, Nikolai Kobelev and Vitaly Khonik
Metals 2022, 12(11), 1964; https://doi.org/10.3390/met12111964 - 17 Nov 2022
Cited by 5 | Viewed by 1207
Abstract
High-precision measurements of the temperature dependences of the high-frequency shear modulus G performed on as-cast, preannealed and predeformed Zr46Cu45Al7Ti2 bulk metallic glass allowed us to determine, for the first time, the harmonic, anharmonic, electronic and relaxation [...] Read more.
High-precision measurements of the temperature dependences of the high-frequency shear modulus G performed on as-cast, preannealed and predeformed Zr46Cu45Al7Ti2 bulk metallic glass allowed us to determine, for the first time, the harmonic, anharmonic, electronic and relaxation components of G. The dependence of anharmonic, electronic and relaxation components on temperature and preliminary inhomogeneous (localized) plastic deformation was investigated. It is found that plastic deformation results in a significant change in these components. We showed that the increase in the integral relaxation contribution to the shear modulus with an increase in plastic deformation can be quantitatively described within the framework of the interstitialcy theory. It is also found that plastic deformation simultaneously leads to an increase in the anharmonic and decrease in the electronic components of the shear modulus. Full article
(This article belongs to the Special Issue Research on Metallic Glasses)
►▼ Show Figures

Figure 1

11 pages, 4033 KiB  
Article
The Influence of High-Pressure Torsion on the Free Volume and Shear-Band Formation during the Indentation of Vit105 Metallic Glass
by Vasily Astanin, Dmitry Gunderov, Vyacheslav Titov and Rashid Asfandiyarov
Metals 2022, 12(8), 1278; https://doi.org/10.3390/met12081278 - 29 Jul 2022
Cited by 2 | Viewed by 1215
Abstract
The research on structural features, microhardness distribution, and deformation features of Vit105 bulk metallic glass (BMG) before and after high-pressure torsion (HPT), as well as after relaxing annealing, has been carried out. HPT n = 1 leads to an increase in free volume [...] Read more.
The research on structural features, microhardness distribution, and deformation features of Vit105 bulk metallic glass (BMG) before and after high-pressure torsion (HPT), as well as after relaxing annealing, has been carried out. HPT n = 1 leads to an increase in free volume ΔV, and relaxing annealing leads to a decrease in ΔV and non-uniformity relative to the initial state of BMG. In the initial BMG and in the BMG after relaxing annealing, microhardness is uniformly distributed over the surface, while in the material subjected to HPT, the microhardness distribution is more heterogeneous. The bonded-interface indentation of the BMG has been conducted in different states. The formation of numerous concentric bands around the indenter is observed. The pattern of band distribution is more homogenous in Vit105 BMG alloy before HPT. In relaxed samples, the bands often have fractures and irregularities, as well as cracks that can be seen under the indents. After HPT, the formation of several intensity bands can be observed, as well as a number of low-intensity ones between the main intensity bands. The average distance between the bands in the initial BMG and BMG after HPT is close to identical, while the distance between the bands is smaller in the relaxed state, which reflects the lower plasticity of the material after annealing. Full article
(This article belongs to the Special Issue Research on Metallic Glasses)
►▼ Show Figures

Figure 1

10 pages, 2509 KiB  
Article
The Effect of Free Volume on the Crystallization of Al87Ni8Gd5 Amorphous Alloy
by Galina Abrosimova, Valentina Chirkova, Elena Pershina, Nikita Volkov, Ilia Sholin and Aleksandr Aronin
Metals 2022, 12(2), 332; https://doi.org/10.3390/met12020332 - 14 Feb 2022
Cited by 16 | Viewed by 1784
Abstract
The effect of free volume on the process of crystallization of an Al87Ni8Gd5 amorphous alloy is investigated. The deformation of the amorphous alloys leads to the formation of shear bands, which contain an enhanced free volume concentration. To [...] Read more.
The effect of free volume on the process of crystallization of an Al87Ni8Gd5 amorphous alloy is investigated. The deformation of the amorphous alloys leads to the formation of shear bands, which contain an enhanced free volume concentration. To retain the free volume the amorphous alloy was coated with a layer of a refractory metal. The structure of the Al87Ni8Gd5 alloy with a protective Ta coating was studied by X-ray diffraction and transmission electron microscopy methods. The fraction of the nanocrystalline phase formed in the amorphous samples with a protective Ta coating under annealing was found to be larger than that in the uncoated samples. The size of Al nanocrystals formed in the coated and uncoated samples is the same. A higher rate of crystal nucleation in the deformed amorphous samples with a protective coating is caused by a higher diffusion coefficient due to an enhanced free volume concentration. Full article
(This article belongs to the Special Issue Research on Metallic Glasses)
►▼ Show Figures

Figure 1

17 pages, 6929 KiB  
Article
Mechanical Behavior of Fe- and Co-Based Amorphous Alloys after Thermal Action
by Inga Permyakova and Alex Glezer
Metals 2022, 12(2), 297; https://doi.org/10.3390/met12020297 - 9 Feb 2022
Cited by 3 | Viewed by 1594
Abstract
The effect of heat treatment on the structure and mechanical properties of Co-Fe-Cr-Si-B/Fe-Cr-B/Fe-Ni-B amorphous alloys has been studied systematically. Melt-quenching (spinning method) was used for production of investigated amorphous alloys. The transmission electron microscopy (TEM) was used to study the structure transformations. The [...] Read more.
The effect of heat treatment on the structure and mechanical properties of Co-Fe-Cr-Si-B/Fe-Cr-B/Fe-Ni-B amorphous alloys has been studied systematically. Melt-quenching (spinning method) was used for production of investigated amorphous alloys. The transmission electron microscopy (TEM) was used to study the structure transformations. The effect of temperature on deformation behavior (plasticity, microhardness, crack resistance, and the density and average length of shear bands) of the amorphous alloys was studied by bending and microindentation. It is shown that the ductile–brittle transition, which occurs at the stage of structure relaxation in amorphous alloys, is caused by two factors: a decrease in the susceptibility of the amorphous matrix to plastic flow and an abrupt decrease in the resistance to the development of quasibrittle cracks. It is established that the transition to a two-phase amorphous–nanocrystalline state upon annealing leads to substantial strengthening of the alloys and a partial recovery of their plasticity. It is proved that the strengthening of amorphous alloys at the initial stages of crystallization can be initiated by the difference in the elastic moduli of the amorphous matrix and the precipitated nanocrystals, as well as by the specific features of the interaction between nanocrystalline phase particles and shear bands propagating under external actions. It is established that the phenomenon of plasticization in amorphous alloys (the crack resistance can increase after annealing in a certain temperature range) is due to the effective retardation of cracks on nanoparticles. Full article
(This article belongs to the Special Issue Research on Metallic Glasses)
►▼ Show Figures

Graphical abstract

8 pages, 1472 KiB  
Article
In Situ Generated Shear Bands in Metallic Glass Investigated by Atomic Force and Analytical Transmission Electron Microscopy
by Harald Rösner, Christian Kübel, Stefan Ostendorp and Gerhard Wilde
Metals 2022, 12(1), 111; https://doi.org/10.3390/met12010111 - 6 Jan 2022
Cited by 5 | Viewed by 1637
Abstract
Plastic deformation of metallic glasses performed at temperatures well below the glass transition proceeds via the formation of shear bands. In this contribution, we investigated shear bands originating from in situ tensile tests of Al88Y7Fe5 melt-spun ribbons performed [...] Read more.
Plastic deformation of metallic glasses performed at temperatures well below the glass transition proceeds via the formation of shear bands. In this contribution, we investigated shear bands originating from in situ tensile tests of Al88Y7Fe5 melt-spun ribbons performed under a transmission electron microscope. The observed contrasts of the shear bands were found to be related to a thickness reduction rather than to density changes. This result should alert the community of the possibility of thickness changes occurring during in situ shear band formation that may affect interpretation of shear band properties such as the local density. The observation of a spearhead-like shear front suggests a propagation front mechanism for shear band initiation here. Full article
(This article belongs to the Special Issue Research on Metallic Glasses)
►▼ Show Figures

Figure 1

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying articles 1-5
Back to TopTop