Special Issue "Bulk Metallic Glasses and Their Composites"

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Materials".

Deadline for manuscript submissions: closed (31 May 2018).

Special Issue Editor

Prof. Dr. Ki Buem Kim
Website
Guest Editor
Department of Advanced Materials Engineering, Sejong University, 143-747 Seoul, South Korea
Interests: Alloy Design; Phase Transformation; Mechanical Properties; Structural and Functional Applications

Special Issue Information

Dear Colleagues,

"Bulk metallic glasses (BMGs)" and "Bulk metallic glass composites (BMGCs)" have been developed and researched for more than two decades. From these great approaches, BMGs with high glass forming ability, high thermal stability, good corrosion and wear resistance and unique mechanical properties have been achieved, which are superior to conventional metals and alloys. Moreover, super-plastic deformability in the supercooled liquid region originated from glass transition of BMGs facilitates net-shape forming processing based on the thermoplastic forming. However, limited macroscopic tensile ductility of BMGs at room temperature is still one of the problems in structural applications.

BMGCs containing various second phases, such as ceramics, ductile and hard crystalline particles, have exhibited excellent and unique properties beyond those of BMGs due to the strong interactions between amorphous and second phases. For example, some recent BMGCs, containing the unique crystalline phase, have been found and exhibit large plasticity and pronounced work-hardening behavior for both compression and tension. These excellent mechanical properties are mainly related to the transformation-induced plasticity, resulting from the stress-induced martensitic transformation of the second phase during deformation, as well as the severe interactions between shear bands and the second phase. Novel BMGCs, with highly-improved mechanical properties, can provides an opportunity for use in structural applications in near future.

Although a large amount of research has been presented, there are still challenges and academic issues regarding alloy design, phase stability, structures, kinetics and various properties of BMGs and BMGCs, as well as novel fabricating and processing methods. This Special Issue focuses on recent advances in novel alloy design, atomic and electronic structures, microstructure, dynamics, various properties, processing, and applications of BMGs and BMGCs. We welcome contributions from researchers, theorists, and computational scientists in field.

Prof. Ki Buem Kim
Guest Editor

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Keywords

  • Bulk metallic glasses

  • Bulk metallic glass composites

  • Glass-forming ability and phase stability

  • Structural relaxation and crystallization

  • Viscous flow behavior

  • Mechanical, chemical, magnetic, electrical properties

  • Deformation and fracture behavior

  • Processing

Published Papers (2 papers)

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Research

Open AccessCommunication
Fabrication of Metallic Glass Layers on Al Alloys with Improved Corrosion Resistance and Micro-Hardness by Pulsed Electrical Discharge Treatment
Appl. Sci. 2018, 8(6), 956; https://doi.org/10.3390/app8060956 - 11 Jun 2018
Cited by 1
Abstract
Pulsed electrical discharge (PED) is a method that has been employed to fabricate metallic glass (MG) layers on Al-Cu-Mg-(Zn) alloys. Abnormal Al and Cu element segregation has been found on the alloys vitrified surfaces after PED treatment. Surface element evaporation was found and [...] Read more.
Pulsed electrical discharge (PED) is a method that has been employed to fabricate metallic glass (MG) layers on Al-Cu-Mg-(Zn) alloys. Abnormal Al and Cu element segregation has been found on the alloys vitrified surfaces after PED treatment. Surface element evaporation was found and proven to be the main reason for such significant segregation. Benefits to the evaporation of the non-corrosion resisting elements in the MG layers, the corrosion resistance, and the surface hardness of Al-Cu-Mg-Zn alloys have been greatly improved. The average corrosion rates of Al-Cu-Mg-Zn alloys with MG layers were reduced to about 2% of that without MG layers. Additionally, the surface hardness of Al-Cu-Mg-Zn alloys with MG layers was increased to 537.173 (±7) HV0.1. PED treatment is a promising way to synthesize MG layers with controllable element proportions and distributions for wear- and corrosion-resistant coatings on traditional Al-Cu-Mg-Zn alloys. Full article
(This article belongs to the Special Issue Bulk Metallic Glasses and Their Composites)
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Open AccessArticle
Brazing Ti-48Al-2Nb-2Cr Alloys with Cu-Based Amorphous Alloy Filler
Appl. Sci. 2018, 8(6), 920; https://doi.org/10.3390/app8060920 - 04 Jun 2018
Cited by 2
Abstract
In this work, the Ti-48Al-2Nb-2Cr (at. %) alloy was successfully brazed using a Cu-based amorphous filler in 600 s under varied brazing temperatures. The element diffusion, microstructure, and precipitation phase of the joints are analyzed in detail, and the formation schemes are discussed. [...] Read more.
In this work, the Ti-48Al-2Nb-2Cr (at. %) alloy was successfully brazed using a Cu-based amorphous filler in 600 s under varied brazing temperatures. The element diffusion, microstructure, and precipitation phase of the joints are analyzed in detail, and the formation schemes are discussed. Reaction products in the joints are found as AlCuTi, Ti2Al, α-Ti, and (Ti,Zr)2(Cu,Ni). The interfacial microstructures varied subjected to the brazing temperature, while the shear strength of the joint firstly increased, and then accordingly decreased. The maximum shear strength of 266 MPa was reached under a brazing temperature of 1213 K and a holding time of 600 s. A formation mechanism was proposed to explain the shear strength variation following the width and amount of brittle compounds in the interfacial reaction layer. Full article
(This article belongs to the Special Issue Bulk Metallic Glasses and Their Composites)
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