The Development of Structure Model in Metallic Glasses

Yue, Xingxing; Inoue, Akihisa; Liu, Chain-Tsuan; Fan, Chenglei

doi:10.1590/1980-5373-mr-2016-0318

Cited by 15 publications

(5 citation statements)

References 128 publications

(117 reference statements)

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“…Yet, it was shown experimentally that some materials can have a hidden order in the MRO region, which is responsible for different packing in crystalline structures (Wu et al, 2015;Zeng et al, 2011). This required modification of the simple models (Yue et al, 2017). Different amorphous states can be realized for metallic glasses, thus we can talk of polyamorphism in these materials (Sheng et al, 2007).…”

Section: Models Of Amorphous Materialsmentioning

confidence: 99%

Towards quantitative treatment of electron pair distribution function

Gorelik

Neder

Terban

et al. 2019

Acta Crystallogr B Struct Sci Cryst Eng Mater

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The pair distribution function (PDF) is a versatile tool to describe the structure of disordered and amorphous materials. Electron PDF (ePDF) uses the advantage of strong scattering of electrons, thus allowing small volumes to be probed and providing unique information on structure variations at the nanoscale. The spectrum of ePDF applications is rather broad: from ceramic to metallic glasses and mineralogical to organic samples. The quantitative interpretation of ePDF relies on knowledge of how structural and instrumental effects contribute to the experimental data. Here, a broad overview is given on the development of ePDF as a structure analysis method and its applications to diverse materials. Then the physical meaning of the PDF is explained and its use is demonstrated with several examples. Special features of electron scattering regarding the PDF calculations are discussed. A quantitative approach to ePDF data treatment is demonstrated using different refinement software programs for a nanocrystalline anatase sample. Finally, a list of available software packages for ePDF calculation is provided.

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Section: Models Of Amorphous Materialsmentioning

confidence: 99%

Towards quantitative treatment of electron pair distribution function

Gorelik

Neder

Terban

et al. 2019

Acta Crystallogr B Struct Sci Cryst Eng Mater

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“…Nanoglasses, which represent a novel structural modification of amorphous materials, exhibit internal structural features on length scale of a few nanometers that result in significant changes in the density and chemical composition [17]. Considerable experimental and theoretical (computer simulations) effort has been made over the last few decades to explore atomic configurations in metallic glasses, and yielded a number of structural models, which successfully describe characteristics of metallic glasses from various perspectives [18][19][20]. Amorphous materials have also been used as building blocks in thin films and multilayers, where they provide soft magnetic properties, low coercivity, and high saturation magnetization as well as control of electron and mass densities.…”

Section: Introductionmentioning

confidence: 99%

Atomic arrangements in an amorphous CoFeB ribbon extracted via an analysis of radial distribution functions

Pussi¹,

Barbiellini²,

Ohara³

et al. 2021

J. Phys.: Condens. Matter

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We discuss the atomic structure of amorphous ferromagnetic FeCoB alloys, which are used widely in spintronics applications. Specifically, we obtain the pair-distribution functions for various atomic pairs based on high-energy x-ray diffraction data taken from an amorphous Co 20 Fe 61 B 19 specimen. We start our reverse Monte Carlo cycles to determine the disordered structure with a two-phase model in which a small amount of cobalt is mixed with Fe 23 B 6 as a second phase. The structure of the alloy is found to be heterogeneous, where the boron atoms drive disorder through the random occupation of the atomic network. Our analysis also indicates the presence of small cobalt clusters that are embedded in the iron matrix and percolating the latter throughout the structure. This morphology can explain the enhanced spin polarization observed in amorphous magnetic materials.

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“…Recently, the structure of MGs has been widely modelled [ 18 , 71 , 72 , 73 ] as comprising interpenetrating quasi-equivalent clusters, i.e., coordination polyhedral, as initially had been suggested by Kasper and Frank, to model the structure of complicated alloys [ 74 , 75 ]. Based on this model, each atom in the alloy is surrounded by a preferred number of neighbouring atoms which are arranged in its nearest neighbour shell with a preferred chemical composition.…”

Section: Structure Of Metallic Glassesmentioning

confidence: 99%

A Critical Review on Metallic Glasses as Structural Materials for Cardiovascular Stent Applications

Jafary-Zadeh

Kumar

Branı́cio

et al. 2018

JFB

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Functional and mechanical properties of novel biomaterials must be carefully evaluated to guarantee long-term biocompatibility and structural integrity of implantable medical devices. Owing to the combination of metallic bonding and amorphous structure, metallic glasses (MGs) exhibit extraordinary properties superior to conventional crystalline metallic alloys, placing them at the frontier of biomaterials research. MGs have potential to improve corrosion resistance, biocompatibility, strength, and longevity of biomedical implants, and hence are promising materials for cardiovascular stent applications. Nevertheless, while functional properties and biocompatibility of MGs have been widely investigated and validated, a solid understanding of their mechanical performance during different stages in stent applications is still scarce. In this review, we provide a brief, yet comprehensive account on the general aspects of MGs regarding their formation, processing, structure, mechanical, and chemical properties. More specifically, we focus on the additive manufacturing (AM) of MGs, their outstanding high strength and resilience, and their fatigue properties. The interconnection between processing, structure and mechanical behaviour of MGs is highlighted. We further review the main categories of cardiovascular stents, the required mechanical properties of each category, and the conventional materials have been using to address these requirements. Then, we bridge between the mechanical requirements of stents, structural properties of MGs, and the corresponding stent design caveats. In particular, we discuss our recent findings on the feasibility of using MGs in self-expandable stents where our results show that a metallic glass based aortic stent can be crimped without mechanical failure. We further justify the safe deployment of this stent in human descending aorta. It is our intent with this review to inspire biodevice developers toward the realization of MG-based stents.

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The Development of Structure Model in Metallic Glasses

Cited by 15 publications

References 128 publications

Towards quantitative treatment of electron pair distribution function

Towards quantitative treatment of electron pair distribution function

Atomic arrangements in an amorphous CoFeB ribbon extracted via an analysis of radial distribution functions

A Critical Review on Metallic Glasses as Structural Materials for Cardiovascular Stent Applications

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