Special Issue "Metallic Glasses: Pathways to Viable Applications"

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

Deadline for manuscript submissions: 30 September 2018

Special Issue Editor

Guest Editor
Prof. Eun Soo Park

Department of Materials Science and Engineering, College of Engineering, Seoul National University, 1 Gwanak-ro Gwanak-gu Seoul 08826 Korea
Website | E-Mail
Interests: tailor-made materials design; phase transformation; microstructural characterization; microstructure-property relationships

Special Issue Information

Dear Colleagues,

Metallic glasses (often referred to as glassy alloys or amorphous alloys) were first widely studied in the 1960s, because they possess both desirable properties of conventional crystalline metals and the formability of conventional oxide glasses. The successful synthesis of various bulk metallic glasses in the late 1980s, permitting minimum section thickness over 1 cm or even larger, has stimulated great enthusiasm in the study of this class of novel metallic materials. Since the beginning of the 1990s, substantial progress has been made in the understanding of physical, chemical and mechanical properties of metallic glasses. Then, over the past 20 years there have been a number of attempts to commercialize bulk metallic glasses. Metallic glasses are still a subject of intensive research in the international metals community. From an application perspective, it is clear that metallic glasses have an interesting combination of properties such as very high strength, very high hardness, large elastic elongation limit, potential for high fracture toughness, and superior corrosion resistance. However, to obtain viable industrial applications we need an alloy is harder and stronger than and is at least as tough as stainless steels, with similar costs. The alloy also needs to have superior corrosion resistance and is high processability. Although we understand metallic glasses much better today, there are still significant gaps in our knowledge that hinder widespread uses of metallic glasses. The goal of this Special Issue is to discuss major materials issues for metallic glasses, from tailor-made design to process optimization, from structures to properties, and from the fundamental science to viable industrial applications. In this Special Issue, we hope to deepen understanding of why metallic glasses attract such intensive interest, as well as highlight some challenging issues awaiting resolution to provide viable paths to more active applications of metallic glasses.

Prof. Eun Soo Park
Guest Editor

Manuscript Submission Information

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Keywords

  • Metallic glasses and composites
  • Material fabrication and processing
  • Theoretical modeling and simulation
  • Properties (mechanical, physical, magnetic, electric, thermal, and corrosion)
  • Industrial applications

Published Papers (5 papers)

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Research

Open AccessArticle The Effects of Metalloid Elements on the Nanocrystallization Behavior and Soft Magnetic Properties of FeCBSiPCu Amorphous Alloys
Metals 2018, 8(4), 283; https://doi.org/10.3390/met8040283
Received: 23 March 2018 / Revised: 13 April 2018 / Accepted: 17 April 2018 / Published: 19 April 2018
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Abstract
Soft magnetic properties of Fe-based metallic glasses (MGs) are dependent on their nanocrystallization behavior, particularly the precipitation of α-Fe embedded in the amorphous matrix. In this study, the effects of metalloid elements of C, B, Si, and P on thermal stability, nanocrystallization behavior,
[...] Read more.
Soft magnetic properties of Fe-based metallic glasses (MGs) are dependent on their nanocrystallization behavior, particularly the precipitation of α-Fe embedded in the amorphous matrix. In this study, the effects of metalloid elements of C, B, Si, and P on thermal stability, nanocrystallization behavior, and soft magnetic properties of typical Fe-based amorphous alloys, i.e., the Fe-Cu-(CBSiP) glassy alloys, were investigated systematically. It is found that the addition of the metalloid elements can effectively retard the precipitation process of α-Fe during reheating of the Fe-based MGs due to the long-range diffusion of the metalloids; however, their individual effects on the compositional portioning and formation of other crystalline phases are varied. To achieve desirable soft magnetic properties, a species of metalloids and their concentrations have to be carefully controlled so that the formation of α-Fe does not interfere with that of other crystalline phases, especially those hard-magnetic phases. Full article
(This article belongs to the Special Issue Metallic Glasses: Pathways to Viable Applications)
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Open AccessArticle Martensitic Transformation and Plastic Deformation of TiCuNiZr-Based Bulk Metallic Glass Composites
Metals 2018, 8(3), 196; https://doi.org/10.3390/met8030196
Received: 7 February 2018 / Revised: 15 March 2018 / Accepted: 16 March 2018 / Published: 20 March 2018
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Abstract
In this study, the microstructural evolution and mechanical properties of TiCuNiZr-based bulk metallic glass (BMGs) composites were systematically investigated in order to optimize both the strength and the ductility of BMGs. By tailoring the glass-forming compositions, TiCuNiZr-based BMG composites with different volume fractions
[...] Read more.
In this study, the microstructural evolution and mechanical properties of TiCuNiZr-based bulk metallic glass (BMGs) composites were systematically investigated in order to optimize both the strength and the ductility of BMGs. By tailoring the glass-forming compositions, TiCuNiZr-based BMG composites with different volume fractions of B2 (Ti,Zr)(Cu,Ni) crystals precipitating in the glassy matrix exhibit not only macroscopic ductility but also high strength as well as work-hardening, which is due to the formation of multiple shear bands and martensitic transformation during deformation. Optimized mechanical properties can be achieved when the crystalline volume fraction is at least higher than 44 vol. %, which is attributed to the sizeable difference between Young’s moduli of the B2 (Ti,Zr)(Cu,Ni) crystals and the glassy matrix, and the precipitation of Ti2Cu intermetallic compounds at the B2 crystal boundaries. Our study provides a complementary understanding of how to tailor mechanical properties of TiCu-based BMG composites. Full article
(This article belongs to the Special Issue Metallic Glasses: Pathways to Viable Applications)
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Open AccessArticle Resistivity and Passivity Characterization of Ni-Base Glassy Alloys in NaOH Media
Metals 2018, 8(1), 64; https://doi.org/10.3390/met8010064
Received: 20 December 2017 / Revised: 13 January 2018 / Accepted: 14 January 2018 / Published: 18 January 2018
Cited by 1 | PDF Full-text (5101 KB) | HTML Full-text | XML Full-text
Abstract
Resistivity and passivation behavior of two Ni-base bulk metallic glasses, with the nominal composition of Ni70Cr21Si0.5B0.5P8C ≤ 0.1Co ≤ 1Fe ≤ 1 (VZ1) and Ni72.65Cr7.3-Si6.7B2.15C
[...] Read more.
Resistivity and passivation behavior of two Ni-base bulk metallic glasses, with the nominal composition of Ni70Cr21Si0.5B0.5P8C ≤ 0.1Co ≤ 1Fe ≤ 1 (VZ1) and Ni72.65Cr7.3-Si6.7B2.15C ≤ 0.06Fe8.2Mo3 (VZ2), in various concentrations of NaOH solutions were studied. The investigations involved cyclic polarization (CP), electrochemical impedance spectroscopy (EIS), and electrochemical frequency modulation (EFM) methods. Cyclic polarization measurements showed spontaneous passivation for both Ni-base glassy alloys at all alkaline concentrations, due to the presence of chromium as an alloying element that formed an oxide film on the alloy surface. The EIS analysis showed that the passive layers grown on the two Ni-base glassy alloy surfaces are formed by a double oxide layer structure. Scanning electron microscope (SEM) examinations of the electrode surface showed Cr, Ni, Fe, and O rich corrosion products that reduced the extent of corrosion damage. Atomic force microscopy (AFM) imaging technique was used to evaluate the topographic and morphologic features of surface layers formed on the surface of the alloys. Full article
(This article belongs to the Special Issue Metallic Glasses: Pathways to Viable Applications)
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Open AccessArticle The Corrosion Behavior of Ti-Based Metallic Glass Matrix Composites in the H2SO4 Solution
Metals 2018, 8(1), 52; https://doi.org/10.3390/met8010052
Received: 6 December 2017 / Revised: 4 January 2018 / Accepted: 4 January 2018 / Published: 17 January 2018
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Abstract
In-situ metallic glass matrix composites (MGMCs) are a new kind of promising structural engineering material. In this study, a comprehensive study about the corrosion behavior of in-situ Ti46Zr20V12Cu5Be17 MGMCs versus their size was conducted.
[...] Read more.
In-situ metallic glass matrix composites (MGMCs) are a new kind of promising structural engineering material. In this study, a comprehensive study about the corrosion behavior of in-situ Ti46Zr20V12Cu5Be17 MGMCs versus their size was conducted. It is interesting to find that the large sample exhibits a more excellent corrosion resistance than the small sample in the 10% H2SO4 solution both in chemical and electrochemical tests at room temperature. Furthermore, the results obtained from X-ray photoelectron spectra (XPS) demonstrate that the quality of the passive film formed on the large-sized sample is indeed superior to the small-sized sample. Based on (scanning electron microscope) SEM observation, the possible mechanisms of the observed phenomenon have been discussed in the present study. Full article
(This article belongs to the Special Issue Metallic Glasses: Pathways to Viable Applications)
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Open AccessArticle Free Volume Contributing to the Different Yield Behaviors between Tension and Compression Deformations in Metallic Glasses
Metals 2017, 7(10), 444; https://doi.org/10.3390/met7100444
Received: 13 September 2017 / Revised: 13 October 2017 / Accepted: 16 October 2017 / Published: 20 October 2017
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Abstract
The different deformation behaviors in the yield stage, in particular, of metallic glasses under uniaxial tension and compression are investigated from an atomic structural perspective, by applying both experimental and simulation methods. A new computational approach for quantitatively calculating free volumes (FVs) in
[...] Read more.
The different deformation behaviors in the yield stage, in particular, of metallic glasses under uniaxial tension and compression are investigated from an atomic structural perspective, by applying both experimental and simulation methods. A new computational approach for quantitatively calculating free volumes (FVs) in structural models is developed, based on which the manner in which FVs contribute to deformation is studied. It is found that FVs have different expansion behaviors in terms of their saturation sizes and corresponding strain values, which are essential structural causes of different yield behaviors in these two deformations in metallic glasses. Full article
(This article belongs to the Special Issue Metallic Glasses: Pathways to Viable Applications)
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