Localized heating during serrated plastic flow in bulk metallic glasses

Wright, Wendelin J.; Schwarz, R. B.; Nix, William D.

doi:10.1016/s0921-5093(01)01066-8

Cited by 286 publications

(140 citation statements)

References 14 publications

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“…The curves demonstrate that the material exhibits the maximum fracture stress of about 430 MPa at a dynamic strain rate of 1.0!10 3 s K1 and about 360 MPa at a quasi-static strain rate of 6.0!10 K4 s K1 . At quasi-static loading conditions, the flow is noted to be serrated, this is similar to that observed previously in Zr-based [32] and Pd-based [33] BMGs. Also, serrated flow has been proposed to be associated with the emission of localized shear bands [32].…”

Section: Resultssupporting

confidence: 87%

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Strain rate-dependent compressive deformation behavior of Nd-based bulk metallic glass

et al. 2005

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Compressive deformation behavior of the Nd 60 Fe 20 Co 10 Al 10 bulk metallic glass was characterized over a wide strain rate range (6.0!10 K4 to 1.0!10 3 s K1 ) at room temperature. Fracture stress was found to increase and fracture strain decrease with increasing applied strain rate. Serrated flow and a large number of shear bands were observed at the quasi-static strain rate (6.0!10 K4 s K1 ). The results suggest that the appearance of a large number of shear bands is probably associated with flow serration observed during compression; and both shear banding and flow serration are a strain accommodation and stress relaxation process. At dynamic strain rates (1.0!10 3 s K1 ), the rate of shear band nucleation is not sufficient to accommodate the applied strain rate and thus causes an early fracture of the test sample. The fracture behavior of the Nd 60 Fe 20 Co 10 Al 10 bulk metallic glass is sensitive to strain rate. q

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Section: Resultssupporting

confidence: 87%

“…At quasi-static loading conditions, the flow is noted to be serrated, this is similar to that observed previously in Zr-based [32] and Pd-based [33] BMGs. Also, serrated flow has been proposed to be associated with the emission of localized shear bands [32].…”

Section: Resultssupporting

confidence: 87%

Strain rate-dependent compressive deformation behavior of Nd-based bulk metallic glass

et al. 2005

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“…This explains why liquid-like morphologies such as the vein-patterns and liquid droplets are often seen in real metallic glass samples, especially after extensive deformation and fracture. 2,3,[27][28][29] For metallic glasses that are intrinsically brittle with little or no accumulated strain, they would exhibit far less liquid-like fracture in surface morphologies or diminishing scales in the vein-patterns. 30) Furthermore, the homogeneous deformation as seen in the tensile simulation suggests that the shear localization may not be the only mechanism for deformation in metallic glasses at low temperatures.…”

Section: )mentioning

confidence: 99%

Free Volume Evolution in Metallic Glasses Subjected to Mechanical Deformation

2007

Mater. Trans.

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We define the Turnbull-Cohen free volume as the critical excess of the Voronoi volume of an atom less its core volume. Using molecular dynamics simulation we calculated the free volume change in two model binary metallic glasses undergoing tension and shear deformation. We show that the free volume change is an integral part of the deformation process; and the shear localization manifested as a shear band is directly related to the inhomogeneous distribution of the free volumes. Shear band formation may consist of two stages: the initial free volume production in the amorphous solids and the liquefaction of the regions with accumulated deformation strains. We show, for the first time, the formation of voids and the ''vein'' patterns on fracture surfaces at atomic scales; they are the combined result of the free volume change and loading and sample conditions.

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“…рис. 3) показывают ре-гулярные сбросы нагрузки, которые характерны для многих ОМС [84], то во время тестирования при криогенных температурах зубцы на кривой не появляются (по крайней мере в пределах чувстви-тельности используемой экспериментальной уста-новки). Отсутствие или наличие скачков нагрузки на деформационной кривой объясняется соотно-шением конкурирующих процессов: сдвиговыми смещениями в образце за счет образования и рас-пространения зон избыточного объема в полосах скольжения и диффузионными перестройками искаженной структуры как внутри этих полос, так и на их фронте.…”

Section: механические свойства омс при криогенной температуреunclassified

Properties of Bulk Metallic Glasses

Luzgin¹,

Polkin²

2016

Izv.VUZ. Tsvet. Met.

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Металловедение и термическая обработка Izvestiya vuzov. Tsvetnaya metallurgiya • 6 • 2016 71 ВведениеМеталлические стекла, получаемые в виде тон-ких чешуек или лент, известны со второй полови-ны прошлого века [1]. Объемные металлические стекла (ОМС) с минимальным размером порядка 100-102 мм в каждом из 3 пространственных из-мерений [2] изначально были получены в системах Pd-Cu-Si и Pd-Ni-P, но ввиду исключительной дороговизны основного компонента (палладия) долгое время не представляли особого интере-са для ученых и инженеров. Впоследствии ОМС, полученные во многих других системах, включая технологически важные -на основе Fe, Mg, Ti и За последние несколько десятилетий открыто относительно небольшое число революционных материалов в области ме-талловедения и физики металлов, и объемные металлические стекла одни из них. Их прочность и твердость значительно выше, а модуль упругости ниже, чем кристаллических сплавов, что приводит к высокой энергии запасенной упругой деформации. Эти материалы также имеют очень хорошую устойчивость к коррозии. В настоящей работе исследованы свойства объемных металлических стекол, в частности тепловые, механические, магнитные, электрические показатели и коррозионная стойкость, а также приводятся области применения данных сплавов. Louzguine-Luzgin D.V., Pol'kin V.I. Properties of bulk metallic glassesA relatively small number of revolutionary discoveries were made in the field of metallurgy and metal physics in the last few decades, and bulk metallic glasses are one of them. The strength and hardness of bulk metallic glasses are much higher while moduli of elasticity are lower than those of crystalline alloys which results in high stored elastic strain energy. These alloys also have very good corrosion resistance. This article covers various properties of bulk metallic glasses, in particular thermal, mechanical, magnetic, electrical properties and corrosion resistance as well as applications of these alloys.Keywords: bulk metallic glasses, strength, ductility, application.

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Localized heating during serrated plastic flow in bulk metallic glasses

Cited by 286 publications

References 14 publications

Strain rate-dependent compressive deformation behavior of Nd-based bulk metallic glass

Strain rate-dependent compressive deformation behavior of Nd-based bulk metallic glass

Free Volume Evolution in Metallic Glasses Subjected to Mechanical Deformation

Properties of Bulk Metallic Glasses

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