Intrinsic plasticity or brittleness of metallic glasses

Lewandowski, John J.; Wang, W. H.; Greer, A.L.

doi:10.1080/09500830500080474

Cited by 1,110 publications

(684 citation statements)

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“…(14) and (15) show that, other factors being constant, both l and Du are proportional to ð1À2nÞ=ð1ÀnÞ. Conner et al [5] obtained this result but did not explore it, as their work preceded the current intense interest in how the plasticity of MGs is correlated with their elastic properties (particularly n) [14][15][16][24][25][26]. We now calculate the dependence of l (Fig.…”

Section: Theoretical Analysis Of Shear-band Spacingmentioning

confidence: 94%

“…A low value of m=B, equally expressed as a high value of Poisson's ratio n, favours plasticity. The link between n and plasticity was noted for metallic glasses by Chen et al [13], and was explored quantitatively by Lewandowski et al [14], who found a sharp transition: Metallic glasses show significant toughness only when n exceeds a critical value of 0.31-0.32. This has excited interest in tuning compositions to increase n, and in this way many tough bulk MGs have been realized [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…We explore their plasticity when n exceeds the critical value noted above. The study by Lewandowski et al [14] suggests that away from the plastic-brittle transition, the toughness continues to rise as n rises. Demetriou et al [17] have shown that a metallic glass with a particularly high n is tougher than any other.…”

Section: Introductionmentioning

confidence: 99%

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Towards more uniform deformation in metallic glasses: The role of Poisson's ratio

Wei

Lei

Huo

et al. 2013

Materials Science and Engineering: A

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a b s t r a c tWe develop a quantitative analysis of how the plastic deformation in a metallic glass is more uniform if its Poisson ratio n is higher. The plasticity of metallic glasses under ambient conditions is mediated by shear localized in thin bands, and can be characterized by experiments on the bending of thin plates. We extend the analysis by Conner et al. (Conner et al., J. Appl. Phys. 94 (2003), 904-911) of bands in bent plates to include the micromechanics of individual shear bands. Expressions are derived for the shearband spacing and the offset on each band. Both these quantities are predicted to decrease as n is increased. The predictions are tested against measurements on metallic glasses with a wide range of n.Good agreement is found, supporting the new model for the shear-band spacing, and pointing the way towards more diffuse deformation, and consequently improved plasticity and toughness, of metallic glasses as n increases toward the limiting value of 0.5. Crown

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Section: Theoretical Analysis Of Shear-band Spacingmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Towards more uniform deformation in metallic glasses: The role of Poisson's ratio

Wei

Lei

Huo

et al. 2013

Materials Science and Engineering: A

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“…Также добавление элемента, повышаю-щего ν, обуславливает образование потенциально пластичного ОМС [78]. Изменение состава ОМС Zr 63-x Cu 24 Al x Ni 10 Co 3 , приводящее к соответствую-щим изменениям модуля упругости, объясняет ва-риации механических свойств с точки зрения внут-ренних структурных изменений [77], которые мо-гут быть весьма значительными [79].…”

Section: рис 2 схематическое изображение полос сдвигаunclassified

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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“…[24] Analysis of these results led to a conclusion that the specific heat in these glasses cannot be described with the Debye model alone and a localized Einstein mode should be taken into account. Figure 7 shows the specific heat vs temperature for Ca 50 …”

Section: Heat Capacity and Localized Einstein Modes In Ca-based Bmgsmentioning

confidence: 99%

Development and Characterization of Low-Density Ca-Based Bulk Metallic Glasses: An Overview

Senkov

Miracle

Keppens

et al. 2007

Metall Mater Trans A

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Ca-based bulk metallic glasses (BMGs) have unique properties and represent a new seventh group of BMGs. Many of them have excellent GFA, which can be related to their efficient atomic packing, low onset driving force for crystallization, and high viscosity (high relaxation time) of the supercooled liquid. The Ca-based glasses have the lowest density and elastic moduli among all BMGs discovered to date. Unfortunately, as many other glasses, Ca-based BMGs are brittle below the glass transition temperature, and they also have marginal oxidation and corrosion resistance. The latter can be improved by proper selection of alloying elements. In this article, we review recent work on the development of low-density Ca-based BMGs and discuss the effect of alloy composition on the thermal, physical, and chemical properties of these glasses.

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Intrinsic plasticity or brittleness of metallic glasses

Cited by 1,110 publications

References 25 publications

Towards more uniform deformation in metallic glasses: The role of Poisson's ratio

Towards more uniform deformation in metallic glasses: The role of Poisson's ratio

Properties of Bulk Metallic Glasses

Development and Characterization of Low-Density Ca-Based Bulk Metallic Glasses: An Overview

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