Formation of Metallic Glass Nanowires by Gas Atomization

Nakayama, Koji S.; Yokoyama, Yoshihiko; Wada, Takeshi; Chen, Na; Inoue, Akihisa

doi:10.1021/nl3003864

Cited by 53 publications

(39 citation statements)

References 34 publications

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“…The unique flow behavior of glasses in undercooled liquid temperature can be utilized to form and shape the viscous liquid into different nanomaterials. This property leads to various methods including hot embossing or imprinting (HI), 1-3 wire drawing, 4,5 gas atomization, 6 and even fracturing the solids, where thin ligaments of metallic glass wires form. 7 Of course, other techniques commonly used for fabricating crystalline wires can also be used for amorphous wires, such as focused ion beam (FIB), where either wires or pillars can be shaped by milling away the rest of the materials outside of the wires using high energy ion beams.…”

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confidence: 99%

Processing dependence of mechanical properties of metallic glass nanowires

Zhang

2015

Applied Physics Letters

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Compared to their crystalline counterparts, nanowires made of metallic glass have not only superb properties but also remarkable processing ability. They can be processed easily and cheaply like plastics via a wide range of methods. To date, the underlying mechanisms of how these different processing routes affect the wires' properties as well as the atomic structure remains largely unknown. Here, by using atomistic modeling, we show that different processing methods can greatly influence the mechanical properties. The nanowires made via focused ion beam milling and embossing exhibit higher strength but localized plastic deformation, whereas that made by casting from liquid shows excellent ductility with homogeneous deformation but reduced strength. The different responses are reflected sensitively in the underlying atomic structure and packing density, some of which have been observed experimentally. The presence of the gradient of alloy concentration and surface effect will be discussed.

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confidence: 99%

Processing dependence of mechanical properties of metallic glass nanowires

Zhang

2015

Applied Physics Letters

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“…2c. The difference between the red curve and the black curve corresponds to the area of exothermic heat flows, indicating that the products significantly include excessive free volume56.…”

Section: Resultsmentioning

confidence: 99%

“…MG nanowires are promising building blocks for magnetic sensors, battery electrodes, and heterogeneous catalysts1234567. The development for practical applications requires a large amount of the high quality MG wires with low cost.…”

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confidence: 99%

Log-normal diameter distribution of Pd-based metallic glass droplet and wire

Yaginuma

Nakajima

Kaneko

et al. 2015

Sci Rep

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We have studied the formation of Pd42.5Cu30Ni7.5P20 metallic glass droplets and wires in the gas atomization process. We demonstrate that the sizes of droplets and wires can be distinguished by the Ohnesorge number (Oh), which is the proportion of the spinnability to the capillary instability, and the diameter distributions follow a log-normal distribution function, implying cascade fragmentation. For droplets, the number significantly increases at Oh < 1 but the diameter gradually decreases. For wires, the number greatly increases at Oh > 1 while the diameter steadies below 400 nm. Further, the wire diameter is quadrupled at Oh = 16 due to the high viscosity which suppresses both capillary breakup and ligament elongation.

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“…Understanding the characteristics of surface STZs is growing in relevance, particularly within the past five years, as researchers have begun fabricating [14,15] and mechanically * linx@bu.edu † parkhs@bu.edu characterizing bulk metallic glass nanowires [16][17][18]. These experimental studies have revealed enhanced tensile ductility in smaller, volume-confined samples, though the potential role of surface STZs in controlling this nanoscale property has not been investigated.…”

Section: Introductionmentioning

confidence: 99%

Surface shear-transformation zones in amorphous solids

2014

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We perform a systematic study of the characteristics of shear transformation zones (STZs) that nucleate at free surfaces of two-dimensional amorphous solids subject to tensile loading using two different atomistic simulation methods, the standard athermal, quasistatic (AQ) approach and our recently developed self-learning metabasin escape (SLME) method, to account for the finite temperature and strain-rate effects. In the AQ, or strain-driven limit, the nonaffine displacement fields of surface STZs decay exponentially away from their centers at similar decay rates as their bulk counterparts, though the direction of maximum nonaffine displacement is tilted away from the tensile axis due to surface effects. Using the SLME method at room temperature and at the high strain rates that are seen in classical molecular dynamics simulations, the characteristics for both bulk and surface STZs are found to be identical to those seen in the AQ simulations. However, using the SLME method at room temperature and experimentally relevant strain rates, we find a transition in the surface STZ characteristics where a loss in the characteristic angular tensile-compression symmetry is observed. Finally, the thermally activated surface STZs exhibit a slower decay rate in the nonaffine displacement field than do strain-driven surface STZs, which is characterized by a larger drop in potential energy resulting from STZ nucleation that is enabled by the relative compliance of the surface as compared to the bulk.

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Formation of Metallic Glass Nanowires by Gas Atomization

Cited by 53 publications

References 34 publications

Processing dependence of mechanical properties of metallic glass nanowires

Processing dependence of mechanical properties of metallic glass nanowires

Log-normal diameter distribution of Pd-based metallic glass droplet and wire

Surface shear-transformation zones in amorphous solids

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