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Metals
Special Issues
Formation, Mechanical Properties and Thermal Stability of Bulk Metallic Glasses
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Formation, Mechanical Properties and Thermal Stability of Bulk Metallic Glasses

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

Deadline for manuscript submissions: closed (31 December 2022) | Viewed by 6633

Special Issue Editor

Prof. Dr. Ignacio A. Figueroa

E-Mail Website
Guest Editor
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México (UNAM), Circuito Exterior s/n, Cd. Universitaria, Ciudad de México 04510, Mexico
Interests: metallic glasses; bulk metallic glasses; non-equilibrium alloys; metallic foams

Special Issue Information

Dear Colleagues,

Most metals do crystallize as they cool down, arranging their atoms into a highly regular three-dimensional pattern. If crystallization does not occur and the atoms remain into a nearly random arrangement, the resulting material is called a “metallic glass”. During the last 30 years, advances have been made in this field as a result of the discovery and development of several families of alloys with substantially improved glass forming ability. These new alloys are referred to as bulk metallic glasses “BMG”. Conventional metallic glasses are generally formed by cooling the melt at rates of 105–106 K/s, however, bulk metallic glasses require cooling rates of only 1–100 K/s or less. BMGs can be cast with dimensions up to several centimeters as compared with maximum thickness or diameter of 10–200 μm for conventional rapidly quenched glassy ribbons and powders. Investigation and production of BMG has displaced the interests in conventional metallic glasses, as the range of applications for thin strips and wires is rather limited, so that the possibility of practical exploitation of the high strengths is very restricted. There are several technological reasons for the current strong interest in bulk amorphous alloys. For instance, the fracture strengths are very high, approximating to the theoretical limit. Moreover, some of the BMGs have a wide supercooled liquid range below their crystallization temperatures and are thus amenable to near-net shaping by processes such as pressing and drawing. It would also be possible to produce complex and intricate shapes by die casting or even, by additive manufacturing.

This Special Issue on “Glass Formation, Processing, Thermal Stability, Mechanical and Magnetic Properties of Bulk and Nanocrystalline Metallic Glasses” intends to collect the latest developments in this area, written by well-known scientists who have significantly contributed to this field.

Topics addressed in this Special Issue may include, but are not limited to:

  • Bulk Glass forming ability
  • Processing (particular attention will be given to additive manufacturing)
  • Bulk nanocrystalline alloys and its properties
  • Crystallization kinetics and thermal properties
  • Mechanical properties
  • Magnetic properties
  • Corrosion behavior
  • Atomic simulation
  • Applications

Dr. Ignacio Alejandro Figueroa
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

  • Bulk metallic glasses
  • Bulk nanocrystalline metallic glasses
  • Metallic glass formation
  • Mechanical properties
  • Crystallization
  • Glassy metals
  • Magnetic properties

Published Papers (4 papers)

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Research

18 pages, 4106 KiB  
Article
Influence of the Glassy Fraction Surface of a ZrCoAlAg Ribbon Alloy on the Bioactive Response to Simulated Body Fluid and Its Effect on Cell Viability
by Aish Escamilla, Jorge Verduzco, Rosa Núñez, Ignacio Figueroa and René García
Metals 2023, 13(1), 55; https://0-doi-org.brum.beds.ac.uk/10.3390/met13010055 - 25 Dec 2022
Viewed by 1258
Abstract
To purpose of this work is to determine the biocompatibility of the Zr58Co21Al9Ag12 alloy; vitreous ribbons of the Zr58Co21Al9Ag12 alloy were obtained by a chill block melt spinner. They [...] Read more.
To purpose of this work is to determine the biocompatibility of the Zr58Co21Al9Ag12 alloy; vitreous ribbons of the Zr58Co21Al9Ag12 alloy were obtained by a chill block melt spinner. They were characterized by X-ray diffraction and transmission electron microscopy. Chemical homogeneity was examined by scanning electron microscopy. Similarly, thermal analysis was performed using differential scanning calorimetry. The nanoindentation test was performed with a Berkovich nanoindenter. Subsequently, the bioactivity was evaluated by chemical immersion in simulated body fluid. After immersion, it was characterized by XRD. A cell adhesion test was performed using mesenchymal stem cells from human dental pulp. Cell viability and proliferation were evaluated with a CCK-8 assay using human lymphocytes. The ribbons have crystalline phases close to 20%. The thermal parameters, Young’s modulus, and hardness were obtained. After the immersion test, Ca and P were identified. Ion release does not exceed critical levels for human cells. The alloy has a higher concentration of adhered cells compared to Ti6Al4V. The alloy remains bio-inert with respect to apatite formation; however, it exhibits excellent cell viability, proliferation, and adhesion behavior. Full article
(This article belongs to the Special Issue Formation, Mechanical Properties and Thermal Stability of Bulk Metallic Glasses)
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11 pages, 4441 KiB  
Article
The Influence of Boron on Microstructural Evolution, Mechanical and Magnetic Behavior of Amorphous Fe91−x(Zr5-Nb4)Bx Melt-Spun Alloys
by Jonathan Zamora, Israel Betancourt and José Alejandro García Hinojosa
Metals 2022, 12(6), 994; https://0-doi-org.brum.beds.ac.uk/10.3390/met12060994 - 10 Jun 2022
Viewed by 1391
Abstract
In this work, we report a systematic study on the microstructure evolution of rapid solidified Fe91−xZr5Nb4Bx alloys (x = 10, 15, 20, 25, 30 at%) under melt-spinning conditions. Mechanical and magnetic properties are also evaluated. X-ray [...] Read more.
In this work, we report a systematic study on the microstructure evolution of rapid solidified Fe91−xZr5Nb4Bx alloys (x = 10, 15, 20, 25, 30 at%) under melt-spinning conditions. Mechanical and magnetic properties are also evaluated. X-ray diffraction patterns indicate that the microstructure across the compositional series consists of an amorphous matrix with partial crystallization when boron concentration is increased. These features were identified by transmission electron microscopy (TEM). The radial distribution function (RDF) affords to resolve the nearest-neighbor configuration. The tensile and microhardness properties were measured to correlate the microstructural evolution with boron content. On the other hand, the magnetic properties of these alloy series were determined by vibrating sample magnetometry (VSM); the saturation magnetization and Curie temperature showed an increasing tendency when increasing the boron content, reaching values up to 110 Am2kg−1 and 465 K, respectively. In addition to the aforementioned, the coercive field remained constant. All these magnetic properties were correlated with the microstructure features observed by XRD, RDF and TEM. Full article
(This article belongs to the Special Issue Formation, Mechanical Properties and Thermal Stability of Bulk Metallic Glasses)
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16 pages, 664 KiB  
Article
Modeling of Diffusion-Controlled Crystallization Kinetics in Al-Cu-Zr Metallic Glass
by Anders Ericsson and Martin Fisk
Metals 2022, 12(5), 867; https://0-doi-org.brum.beds.ac.uk/10.3390/met12050867 - 19 May 2022
Cited by 2 | Viewed by 1695
Abstract
Crystallization is a major challenge in metallic glass production, and predictive models may aid the development of controlled microstructures. This work describes a modeling strategy of nucleation, growth and the dissolution of crystals in a multicomponent glass-forming system. The numerical model is based [...] Read more.
Crystallization is a major challenge in metallic glass production, and predictive models may aid the development of controlled microstructures. This work describes a modeling strategy of nucleation, growth and the dissolution of crystals in a multicomponent glass-forming system. The numerical model is based on classical nucleation theory in combination with a multicomponent diffusion-controlled growth model that is valid for high supersaturation. The required thermodynamic properties are obtained by coupling the model to a CALPHAD database using the Al-Cu-Zr system as a demonstrator. The crystallization of intermetallic Al,CumZrn phases from the undercooled liquid phase were simulated under isothermal as well as rapid heating and cooling conditions (10−1–106Ks−1). The obtained time–temperature transformation and continuous-heating/cooling transformation diagrams agree satisfactorily with the experimental data over a wide temperature range, thereby, demonstrating the predictability of the modeling approach. A comparison of the simulation results and experimental data is discussed. Full article
(This article belongs to the Special Issue Formation, Mechanical Properties and Thermal Stability of Bulk Metallic Glasses)
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14 pages, 3151 KiB  
Article
Crystallization Kinetics of Hypo, Hyper and Eutectic Ni–Nb Glassy Alloys
by Laura Esmeralda Mendoza, José Manuel Hernández, José Gonzalo González, Emilio Orgaz, Octavio Lozada and Ignacio Alejandro Figueroa
Metals 2022, 12(5), 808; https://0-doi-org.brum.beds.ac.uk/10.3390/met12050808 - 07 May 2022
Viewed by 1541
Abstract
This study presents the thermal and kinetic behavior of Ni58.5Nb41.5, Ni59.5Nb40.5, and Ni60.5Nb39.5 binary glassy alloys. The alloys ingots were obtained through an electric arc furnace and the ribbons using the melt-spinning [...] Read more.
This study presents the thermal and kinetic behavior of Ni58.5Nb41.5, Ni59.5Nb40.5, and Ni60.5Nb39.5 binary glassy alloys. The alloys ingots were obtained through an electric arc furnace and the ribbons using the melt-spinning technique at two different wheel speeds, 8 and 25 m/s. The non-isothermal study was carried out by means of Differential Scanning Calorimetry (DSC) at five different heating rates: 12.5, 15, 17.5, 20, and 22.5 K/min. X-ray Diffraction (XRD) analysis showed a fully glassy phase for all ribbons for all compositions. For both wheel speeds, the ribbons with higher Nb content were significantly thinner than those with less content. The activation energies were calculated from the Kissinger method, showing the tendency Ep1>Ex1>Eg, where Ep1, Ex and Eg denote the activation energies of first peak temperature, the first crystallization onset and glass transition, respectively. The Flynn–Wall–Ozawa model displayed a close correlation with heating rates, ribbon thicknesses, and composition. The Nb content enhanced the glassy stability since the activation energy required for crystallization increased at higher Nb concentrations. Full article
(This article belongs to the Special Issue Formation, Mechanical Properties and Thermal Stability of Bulk Metallic Glasses)
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