Structure and Properties of Amorphous Metallic Alloys

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Entropic Alloys and Meta-Metals".

Deadline for manuscript submissions: closed (30 November 2023) | Viewed by 5089

Special Issue Editor


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Guest Editor
School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
Interests: fabrication; microstructure; dynamics and magnetic properties of amorphous alloys

Special Issue Information

Dear Colleagues,

Amorphous alloys have stimulated widespread research enthusiasm for a long time because of their technological promise for structural and functional applications and scientific importance in understanding glass formation, relaxation and crystallization. These alloys represent a novel class of metallic materials with extraordinary mechanical, physical and chemical properties including extreme strength and hardness at room temperature and high flexibility at high temperature, excellent soft magnetic properties, attractive corrosion resistance, and excellent catalytic performance, etc. While more and more amorphous alloys have been developed and investigated in recent years, the local structure of amorphous alloys has been a long-standing mystery, due to the complex topological and chemical short-to-medium range order and the heterogeneous nature. How atomic packing changes with composition, temperature, and pressure, and more significantly, how the short-to-medium range order determines the properties of amorphous alloys, are unresolved questions, which become a major impediment for their wider industrialized applications.

This Special Issue aims to present the latest research related to the short-to-medium range order of amorphous alloys, and its correlation with mechanical, physical and mechanical properties.

Prof. Dr. Qiang Luo
Guest Editor

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Keywords

  • glass formation
  • local structure
  • heterogeneity
  • deformation  
  • corrosion and catalysis
  • magnetic properties

Published Papers (2 papers)

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Research

18 pages, 4823 KiB  
Article
Dual Cluster Model for Medium-Range Order in Metallic Glasses
by Masato Shimono and Hidehiro Onodera
Metals 2021, 11(11), 1840; https://doi.org/10.3390/met11111840 - 16 Nov 2021
Cited by 2 | Viewed by 2047
Abstract
The atomic structure of medium-range order in metallic glasses is investigated by using molecular dynamics (MD) simulations. Glass formation processes were simulated by rapid cooling from liquid phases of a model binary alloy system of different-sized elements. Two types of short-range order of [...] Read more.
The atomic structure of medium-range order in metallic glasses is investigated by using molecular dynamics (MD) simulations. Glass formation processes were simulated by rapid cooling from liquid phases of a model binary alloy system of different-sized elements. Two types of short-range order of atomic clusters with the five-fold symmetry are found in glassy phases: icosahedral clusters (I-clusters) formed around the smaller-sized atoms and Frank–Kasper clusters (i.e., Z14, Z15, and Z16 clusters (Z-clusters)) formed around the bigger-sized atoms. Both types of clusters (I-and Z-clusters) are observed even in liquid phases and the population of them goes up as the temperature goes down. A considerable atomic size difference between alloying elements would enhance the formation of both the I- and Z-clusters. In glassy phases, the I- and Z-clusters are mutually connected to form a complicated network, and the network structure becomes denser as the structural relaxation goes on. In the network, the medium-range order is mainly constructed by the volume sharing type connection between I- and Z-clusters. Following Nelson’s disclination theory, the network structure can be understood as a random network of Z-clusters, which is complimentarily surrounded by another type of network formed by I-clusters. Full article
(This article belongs to the Special Issue Structure and Properties of Amorphous Metallic Alloys)
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10 pages, 4449 KiB  
Article
Effect of Co/Ni Substituting Fe on Magnetocaloric Properties of Fe-Based Bulk Metallic Glasses
by Jia Guo, Lei Xie, Cong Liu, Qiang Li, Juntao Huo, Chuntao Chang, Hongxiang Li and Xu Ma
Metals 2021, 11(6), 950; https://doi.org/10.3390/met11060950 - 11 Jun 2021
Cited by 6 | Viewed by 1945
Abstract
In this work, Fe80-xMxP13C7 (M = Co, Ni; x = 0, 5 and 10 at.%) bulk metallic glasses (BMGs) were prepared, and the effect of the Co/Ni elements substitution for Fe on the magnetocaloric properties of [...] Read more.
In this work, Fe80-xMxP13C7 (M = Co, Ni; x = 0, 5 and 10 at.%) bulk metallic glasses (BMGs) were prepared, and the effect of the Co/Ni elements substitution for Fe on the magnetocaloric properties of Fe80P13C7 BMG has been investigated systematically. The Curie temperature (TC) of the present Fe-based BMGs increases with the substitution of Fe by Co/Ni. The magnetic entropy change (ΔSM) of the present Fe-based BMGs increases first and then decreases with the increase of Fe substituted by Co, but monotonically decreases with the increase of Fe substituted by Ni. Among the present Fe-based BMGs, the Fe75Co5P13C7 BMG exhibits the maximum ΔSM value of 5.21 J kg−1 K−1 at an applied field of 5 T, which is the largest value among Fe-based amorphous alloys without any rare earth elements reported so far. The present Fe-based BMGs exhibit the large glass forming ability, tunable TC and enhanced ΔSM value, which are beneficial for magnetic refrigerant materials. Full article
(This article belongs to the Special Issue Structure and Properties of Amorphous Metallic Alloys)
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