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Advances in Metallic Glass Matrix Composites
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Advances in Metallic Glass Matrix Composites

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced Composites".

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 20336

Special Issue Editor

Dr. Daniel Şopu

E-Mail Website
Guest Editor
Technische Universität (TU) Darmstadt, Darmstadt, Germany
Interests: atomistic modeling; metallic glasses; nanoglasses; kinetics of phase transformations; vibrational properties of nanostructured materials, thin films, and laminar structures; shape memory alloys

Special Issue Information

Dear Colleagues,

Metallic glasses have attracted a great deal of interest due to their advantageous mechanical properties, such as high yield strength and a high elastic limit. However, the current limitations of metallic glasses are tied to their poor plasticity at room temperature. A strategy to overcome brittle failure is the development of metallic glass matrix composites (MGCs) with a crystalline second phase. Crystalline heterogeneities of various forms and phases, ranging from micrometer- to nanometer-sized inclusions, represent effective constraints on the catastrophic propagation of shear bands and promote the multiplication of shear bands. The complex and competing mechanisms of deformation that occur in the glassy matrix and crystalline inclusions allow MGCs to exhibit a high degree of plasticity.

The objective of this Special Issue is to attract contributions that combine modeling approaches with experimental works. The contribution should give a comprehensive description of the phenomena occurring in the MGC. The ultimate goal is to provide useful insights into the structure–property relationships of MGCs and clarify different aspects that are observed empirically in both experiments and simulations.

Dr. Daniel Şopu
Guest Editor

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Keywords

  • metallic glass composites
  • atomistic simulations
  • finite element simulations
  • microstructure
  • deformation
  • plasticity
  • shear bands
  • crystalline precipitates in metallic glass
  • work hardening
  • martensitic phase transformation.

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Published Papers (7 papers)

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Research

10 pages, 1596 KiB  
Article
Relaxation and Strain-Hardening Relationships in Highly Rejuvenated Metallic Glasses
by Xudong Yuan, Daniel Şopu, Kaikai Song and Jürgen Eckert
Materials 2022, 15(5), 1702; https://doi.org/10.3390/ma15051702 - 24 Feb 2022
Cited by 6 | Viewed by 3760
Abstract
One way to rejuvenate metallic glasses is to increase their free volume. Here, by randomly removing atoms from the glass matrix, free volume is homogeneously generated in metallic glasses, and glassy states with different degrees of rejuvenation are designed and further mechanically tested. [...] Read more.
One way to rejuvenate metallic glasses is to increase their free volume. Here, by randomly removing atoms from the glass matrix, free volume is homogeneously generated in metallic glasses, and glassy states with different degrees of rejuvenation are designed and further mechanically tested. We find that the free volume in the rejuvenated glasses can be annihilated under tensile or compressive deformation that consequently leads to structural relaxation and strain-hardening. Additionally, the deformation mechanism of highly rejuvenated metallic glasses during the uniaxial loading–unloading tensile tests is investigated, in order to provide a systematic understanding of the relaxation and strain-hardening relationship. The observed strain-hardening in the highly rejuvenated metallic glasses corresponds to stress-driven structural and residual stress relaxation during cycling deformation. Nevertheless, the rejuvenated metallic glasses relax to a more stable state but could not recover their initial as-cast state. Full article
(This article belongs to the Special Issue Advances in Metallic Glass Matrix Composites)
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13 pages, 2221 KiB  
Article
Rejuvenation in Deep Thermal Cycling of a Generic Model Glass: A Study of Per-Particle Energy Distribution
by Marian Bruns and Fathollah Varnik
Materials 2022, 15(3), 829; https://doi.org/10.3390/ma15030829 - 22 Jan 2022
Cited by 5 | Viewed by 1932
Abstract
We investigate the effect of low temperature (cryogenic) thermal cycling on a generic model glass and observe signature of rejuvenation in terms of per-particle potential energy distributions. Most importantly, these distributions become broader and its average values successively increase when applying consecutive thermal [...] Read more.
We investigate the effect of low temperature (cryogenic) thermal cycling on a generic model glass and observe signature of rejuvenation in terms of per-particle potential energy distributions. Most importantly, these distributions become broader and its average values successively increase when applying consecutive thermal cycles. We show that linear dimension plays a key role for these effects to become visible, since we do only observe a weak effect for a cubic system of roughly one hundred particle diameter but observe strong changes for a rule-type geometry with the longest length being two thousand particle diameters. A consistent interpretation of this new finding is provided in terms of a competition between relaxation processes, which are inherent to glassy systems, and excitation due to thermal treatment. In line with our previous report (Bruns et al., PRR 3, 013234 (2021)), it is shown that, depending on the parameters of thermal cycling, rejuvenation can be either too weak to be detected or strong enough for a clear observation. Full article
(This article belongs to the Special Issue Advances in Metallic Glass Matrix Composites)
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12 pages, 6164 KiB  
Article
Molecular Dynamics Study of the Nanoindentation Behavior of Cu64Zr36/Cu Amorphous/Crystalline Nanolaminate Composites
by Wen-Ping Wu, Daniel Şopu and Jürgen Eckert
Materials 2021, 14(11), 2756; https://doi.org/10.3390/ma14112756 - 23 May 2021
Cited by 15 | Viewed by 2638
Abstract
Amorphous/crystalline nanolaminate composites have aroused extensive research interest because of their high strength and good plasticity. In this paper, the nanoindentation behavior of Cu64Zr36/Cu amorphous/crystalline nanolaminates (ACNLs) is investigated by molecular dynamics (MD) simulation while giving special attention to [...] Read more.
Amorphous/crystalline nanolaminate composites have aroused extensive research interest because of their high strength and good plasticity. In this paper, the nanoindentation behavior of Cu64Zr36/Cu amorphous/crystalline nanolaminates (ACNLs) is investigated by molecular dynamics (MD) simulation while giving special attention to the plastic processes occurring at the interface. The load–displacement curves of ACNLs reveal small fluctuations associated with shear transformation zone (STZ) activation in the amorphous layer, whereas larger fluctuations associated with dislocations emission occur in the crystalline layer. During loading, local STZ activation occurs and the number of STZs increases as the indentation depth in the amorphous layer increases. These STZs are mostly located around the indenter, which correlates to the high stresses concentrated around the indenter. When the indenter penetrates the crystalline layer, dislocations emit from the interface of amorphous/crystalline, and their number increases with increasing indentation depth. During unloading, the overall number of STZs and dislocations decreases, while other new STZs and dislocations become activated. These results are discussed in terms of stress distribution, residual stresses, indentation rate and indenter radius. Full article
(This article belongs to the Special Issue Advances in Metallic Glass Matrix Composites)
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12 pages, 4001 KiB  
Article
Enhanced Mechanical Properties of Metallic Glass Thin Films via Modification of Structural Heterogeneity
by Xindi Ma, Kang Sun, Peiyou Li, Nizhen Zhang, Qing Wang and Gang Wang
Materials 2021, 14(4), 999; https://doi.org/10.3390/ma14040999 - 20 Feb 2021
Cited by 4 | Viewed by 2379
Abstract
The structure of Cu50Zr50 and Co56Ta35B9 metallic glass thin films (MGTF) was effectively tailored via various applied substrate temperatures by means of the magnetron sputtering technology. Obviously enhanced hardness and elastic modulus are achieved by [...] Read more.
The structure of Cu50Zr50 and Co56Ta35B9 metallic glass thin films (MGTF) was effectively tailored via various applied substrate temperatures by means of the magnetron sputtering technology. Obviously enhanced hardness and elastic modulus are achieved by different compositional MGTFs by increasing the substrate temperature. Compared with the CuZr MGTFs, the CoTaB MGTF deposited at 473 K displays the smaller strain-rate sensitivity exponent, m, and a weaker spectrum intensity based on the nanoindentation creep test, suggesting its better creep resistance. In addition, the STZ volume of the CoTaB MGTF significantly decreases after depositing at higher temperature. According to the nano-scratch analysis, the CoTaB MGTF at the substrate temperatures of 473 K performs the shallower scratch width and the larger H3/E2 value, indicating its better tribological property. Full article
(This article belongs to the Special Issue Advances in Metallic Glass Matrix Composites)
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13 pages, 8739 KiB  
Article
Development of Co-Based Amorphous Composite Coatings Synthesized by Laser Cladding for Neutron Shielding
by Xiaobin Liu, Jiazi Bi, Ziyang Meng, Yubin Ke, Ran Li and Tao Zhang
Materials 2021, 14(2), 279; https://doi.org/10.3390/ma14020279 - 7 Jan 2021
Cited by 9 | Viewed by 2397
Abstract
Advanced amorphous coatings consisting of Co-based metallic glasses with ultrahigh strength (6 GPa) and high microhardness (up to 17 GPa) can significantly improve the surface properties of matrix materials. However, the intrinsic brittleness of Co-based metallic glasses can lead to the initiation of [...] Read more.
Advanced amorphous coatings consisting of Co-based metallic glasses with ultrahigh strength (6 GPa) and high microhardness (up to 17 GPa) can significantly improve the surface properties of matrix materials. However, the intrinsic brittleness of Co-based metallic glasses can lead to the initiation of microcracks caused by the inevitable generation of thermal stress during the laser cladding process, which severely limits the potential application. In this paper, the methods of increasing substrate temperature and fabricating composite coatings with the addition of toughened Fe powders were adopted to inhibit the generation of microcracks in the Co55Ta10B35 amorphous coatings. Moreover, neutron shielding performances of the cladding coatings with high B content were investigated with a wide range of neutron energy (wavelength: 0.15–0.85 nm). The results indicate that the fully amorphous coating and composite ones can be fabricated successfully. The increase in the substrate temperature and the addition of Fe powders can effectively inhibit the initiation and propagation of microcracks. The fully Co-based amorphous coating with high B content (35 at.%) can exhibit excellent neutron shielding performance. With the addition of Fe powders, the neutron shielding performance is reduced gradually due to the dilution effect of B in the composite cladding coatings, but the microcrack will be completely restrained. Full article
(This article belongs to the Special Issue Advances in Metallic Glass Matrix Composites)
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8 pages, 2844 KiB  
Article
Soft Ferromagnetic Bulk Metallic Glass with Potential Self-Healing Ability
by Parthiban Ramasamy, Mihai Stoica, Gabriel Ababei, Nicoleta Lupu and Jürgen Eckert
Materials 2020, 13(6), 1319; https://doi.org/10.3390/ma13061319 - 14 Mar 2020
Cited by 2 | Viewed by 3399
Abstract
A new concept of soft ferromagnetic bulk metallic glass (BMG) with self-healing ability is proposed. The specific [Fe36Co36B19.2Si4.8Nb4]100−x(Ga)x (x = 0, 0.5, 1 and1.5) BMGs prepared by copper mold casting [...] Read more.
A new concept of soft ferromagnetic bulk metallic glass (BMG) with self-healing ability is proposed. The specific [Fe36Co36B19.2Si4.8Nb4]100−x(Ga)x (x = 0, 0.5, 1 and1.5) BMGs prepared by copper mold casting were investigated as a function of Ga content. The Ga-containing BMGs still hold soft magnetic properties and exhibit large plastic strain of 1.53% in compression. Local melting during shearing produces molten droplets of several µm size throughout the fracture surface. This concept of local melting during shearing can be utilized to produce BMGs with self-healing ability. The molten regions play a vital role in deflecting shear transformation zones, thereby enhancing the mechanical properties. Full article
(This article belongs to the Special Issue Advances in Metallic Glass Matrix Composites)
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Graphical abstract

9 pages, 3046 KiB  
Article
A Multiple Twin-Roller Casting Technique for Producing Metallic Glass and Metallic Glass Composite Strips
by Yi Wu, Long Zhang, Sen Chen, Wen Li and Haifeng Zhang
Materials 2019, 12(23), 3842; https://doi.org/10.3390/ma12233842 - 21 Nov 2019
Cited by 8 | Viewed by 2904
Abstract
To date it has not been possible to produce metallic glass strips with a thickness larger than 150 μm via single-roller melt spinning technique, and it remains challenging to produce thick metallic glass strips. In this work, a multiple twin-roller casting technique is [...] Read more.
To date it has not been possible to produce metallic glass strips with a thickness larger than 150 μm via single-roller melt spinning technique, and it remains challenging to produce thick metallic glass strips. In this work, a multiple twin-roller casting technique is proposed for producing thick metallic glass and metallic glass composite strips. A triple twin-roller casting device, as a specific case of the multiple twin-roller, was designed and manufactured. The triple twin-roller device possesses a high cooling rate and involves a long contact time between the melt and the strip, which makes it an efficient technique for producing metallic glass strips that avoids crystallization, although the solidification temperature ranges of metallic glasses are as wide as several hundred Kelvins. The two prepared metallic glass (MG) strips are in a fully amorphous state, and the MG strip shows excellent capacity of stored elastic energy under 3-point bending. Furthermore, the Ti-based metallic glass composite strip produced via the triple twin-roller casting exhibits a novel microstructure with much finer and more homogenously orientated β-Ti crystals, as compared with the microstructure of metallic glass composites produced by the common copper mold casting technique. Full article
(This article belongs to the Special Issue Advances in Metallic Glass Matrix Composites)
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