Bulk Metallic Glasses

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

Deadline for manuscript submissions: closed (31 May 2017) | Viewed by 19610

Special Issue Editor

1. Mathematics for Advanced Materials-OIL, AIST-Tohoku University, Sendai 980-8577, Japan
2. WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

Special Issue Information

Dear Colleagues,

Bulk metallic glasses, which are a new breed of metallic materials exhibiting an extremely high glass formability, have been developed steadily over the last 30 years. Their unique disordered atomic structure provides a wide variety of intriguing phenomena and remarkable properties. This Special Issue focuses on recent advances in atomic and electronic structures, dynamics, various properties, processing, and applications of bulk metallic glasses. We welcome contributions from experimentalists, theorists, and computational scientists in this research field.

Assoc. Prof. Akihiko Hirata
Guest Editor

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Keywords

  • Bulk metallic glasses
  • Atomic and electronic structures
  • Structural relaxation and crystallization
  • Glass formability and stability
  • Mechanical, electronic, magnetic, chemical properties

Published Papers (4 papers)

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Research

3951 KiB  
Article
Excellent Performance of Fe78Si9B13 Metallic Glass for Activating Peroxymonosulfate in Degradation of Naphthol Green B
by Xue-Fen Li, Shun-Xing Liang, Xiao-Wang Xi, Zhe Jia, Shi-Kun Xie, He-Chun Lin, Jun-Ping Hu and Lai-Chang Zhang
Metals 2017, 7(7), 273; https://doi.org/10.3390/met7070273 - 17 Jul 2017
Cited by 30 | Viewed by 5068
Abstract
The functional application of metallic glasses in the catalytic field has widely attracted research attention due to its unique atomic structure compared to crystalline materials. It has been reported that metallic glasses can effectively activate H2O2 and persulfate, yet the [...] Read more.
The functional application of metallic glasses in the catalytic field has widely attracted research attention due to its unique atomic structure compared to crystalline materials. It has been reported that metallic glasses can effectively activate H2O2 and persulfate, yet the activation of peroxymonosulfate by metallic glasses is not studied well. In this work, the metallic glass with atomic composition of Fe78Si9B13 was applied for investigating the peroxymonosulfate (PMS) activation on degradation of naphthol green B (NGB) dye. The change of surface morphology indicated the important role of oxide films during the dye degradation. The effects and first-order kinetics model of various reaction parameters were evaluated systematically, including PMS concentration, catalyst dosage, irradiation intensity, and dye concentration. The results showed that about 98% of the dye removal rate could be achieved only within 10 min under rational conditions. The reaction kinetics k of 0.1339 min−1 without ribbons was sharply improved to 0.3140 min−1 by adding 0.5 g/L ribbons, indicating the superior activation ability of Fe78Si9B13 metallic glass. The recycling experiment revealed that the Fe78Si9B13 ribbons exhibited the excellent surface stability and catalytic reusability for activating PMS even after reused for 10th run. Full article
(This article belongs to the Special Issue Bulk Metallic Glasses)
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632 KiB  
Article
Localization Phenomena in Disordered Tantalum Films
by Natalia Kovaleva, Dagmar Chvostova and Alexandr Dejneka
Metals 2017, 7(7), 257; https://doi.org/10.3390/met7070257 - 07 Jul 2017
Cited by 5 | Viewed by 4964
Abstract
Using dc transport and wide-band spectroscopic ellipsometry techniques we study localization phenomena in highly disordered metallic β -Ta films grown by rf sputtering deposition. The dc transport study implies non-metallic behavior (d ρ /dT < 0), with negative temperature coefficient of resistivity [...] Read more.
Using dc transport and wide-band spectroscopic ellipsometry techniques we study localization phenomena in highly disordered metallic β -Ta films grown by rf sputtering deposition. The dc transport study implies non-metallic behavior (d ρ /dT < 0), with negative temperature coefficient of resistivity (TCR). We found that as the absolute TCR value increased, specifying an elevated degree of disorder, the free charge carrier Drude response decreases, indicating the enhanced charge carrier localization. Moreover, we found that the pronounced changes occur at the extended spectral range, involving not only the Drude resonance, but also the higher-energy Lorentz bands, in evidence of the attendant electronic correlations. We propose that the charge carrier localization, or delocalization, is accompanied by the pronounced electronic band structure reconstruction due to many-body effects, which may be the key feature for understanding the physics of highly disordered metals. Full article
(This article belongs to the Special Issue Bulk Metallic Glasses)
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1258 KiB  
Article
The Effect of Iron Content on Glass Forming Ability and Thermal Stability of Co–Fe–Ni–Ta–Nb–B–Si Bulk Metallic Glass
by Aytekin Hitit and Hakan Şahin
Metals 2017, 7(1), 7; https://doi.org/10.3390/met7010007 - 29 Dec 2016
Cited by 4 | Viewed by 4848
Abstract
In this study, change in glass forming ability (GFA) and thermal stability of Co–Fe-based bulk metallic glasses were investigated as a function of iron content. Cylindrical samples of alloys with diameters of up to 4 mm were synthesized by a suction casting method [...] Read more.
In this study, change in glass forming ability (GFA) and thermal stability of Co–Fe-based bulk metallic glasses were investigated as a function of iron content. Cylindrical samples of alloys with diameters of up to 4 mm were synthesized by a suction casting method in an arc furnace. Structures and thermal properties of the as-cast samples were determined by X-ray diffraction (XRD) and differential scanning calorimetry (DSC), respectively. It was found that the critical casting thickness of the alloys reduced as iron content was increased and cobalt content was decreased. It was determined that GFA parameters, reduced glass transition temperature (Tg/Tl) and δ (= Tx/(Tl − Tg)), show a very good correlation with critical casting thickness values. It was also observed that changing iron content did not effect thermal properties of the alloys. Full article
(This article belongs to the Special Issue Bulk Metallic Glasses)
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3388 KiB  
Article
The Effect of Thermal Cycling Treatments on the Thermal Stability and Mechanical Properties of a Ti-Based Bulk Metallic Glass Composite
by Fan Bu, Jun Wang, Liyuan Li, Hongchao Kou, Xiangyi Xue and Jinshan Li
Metals 2016, 6(11), 274; https://doi.org/10.3390/met6110274 - 10 Nov 2016
Cited by 10 | Viewed by 4244
Abstract
The effect of thermal cycling treatments on the thermal stability and mechanical properties of a Ti48Zr20Nb12Cu5Be15 bulk metallic glass composite (BMGC) has been investigated. Results show that moderate thermal cycles in a temperature range [...] Read more.
The effect of thermal cycling treatments on the thermal stability and mechanical properties of a Ti48Zr20Nb12Cu5Be15 bulk metallic glass composite (BMGC) has been investigated. Results show that moderate thermal cycles in a temperature range of −196 °C (cryogenic temperature, CT) to 25 °C (room temperature, RT) or annealing time at CT has not induced obvious changes of thermal stability and then it decreases slightly over critical thermal parameters. In addition, the dendritic second phases with a bcc structure are homogeneously embedded in the amorphous matrix; no visible changes are detected, which shows structural stability. Excellent mechanical properties as high as 1599 MPa yield strength and 34% plastic strain are obtained, and the yield strength and elastic modulus also increase gradually. The effect on the stability is analyzed quantitatively by crystallization kinetics and plastic-flow models, and indicates that the reduction of structural relaxation enthalpy, which is related to the degradation of spatial heterogeneity, reduces thermal stability but does not imperatively deteriorate the plasticity. Full article
(This article belongs to the Special Issue Bulk Metallic Glasses)
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