New regime of homogeneous flow in the deformation map of metallic glasses: elevated temperature nanoindentation experiments and mechanistic modeling

Schuh, Christopher A.; Lund, Alan C.; Nieh, T.G.

doi:10.1016/j.actamat.2004.09.005

Cited by 423 publications

(308 citation statements)

References 53 publications

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“…Some studies reported that for a shear band to be fully developed and propagate, its nucleus would need to be at least ~50-500 nm [4,9,51], which means that small nanoscale samples may not provide sufficient space for shear banding to occur. Another deformation unit relevant at even larger length scales is the plastic zone size at the tip of an M A N U S C R I P T…”

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confidence: 99%

3D nano-architected metallic glass: Size effect suppresses catastrophic failure

Liontas

Greer

2017

Acta Materialia

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We investigate the mechanical behavior of 3D periodically architected metallic glass nanolattices, constructed from hollow beams of sputtered Zr-Ni-Al metallic glass. Nanolattices composed of beams with different wall thicknesses are fabricated by varying the sputter deposition time, resulting in nanolattices with median wall thicknesses of ~88 nm, ~57 nm, ~38 nm, ~30 nm, ~20 nm, and ~10 nm. Uniaxial compression experiments conducted inside a scanning electron microscope reveal a transition from brittle, catastrophic failure in thickerwalled nanolattices (median wall thicknesses of ~88 and ~57 nm) to deformable, gradual, layerby-layer collapse in thinner-walled nanolattices (median wall thicknesses of ~38 nm and less).As the nanolattice wall thickness is varied, large differences in deformability are manifested through the severity of strain bursts, nanolattice recovery after compression, and in-situ images obtained during compression experiments. We explain the brittle-to-deformable transition that occurs as the nanolattice wall thickness decreases in terms of the "smaller is more deformable" material size effect that arises in nano-sized metallic glasses. This work demonstrates that the nano-induced failure-suppression size effect that emerges in small-scale metallic glasses can be proliferated to larger-scale materials by the virtue of architecting.

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3D nano-architected metallic glass: Size effect suppresses catastrophic failure

Liontas

Greer

2017

Acta Materialia

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“…Формирование полос сдвиговой деформации [35,36] приводит к появлению ступенек на боко-вой поверхности образца, что показано на рис. 4.…”

Section: рис 2 схематическое изображение полос сдвигаunclassified

“…В случае, когда сдвиг обусловлен релакса-цией упругой энергии образца, значительное по-вышение температуры может возникнуть в резуль-тате локализованного течения. Локальный нагрев в полосах сдвига, в зависимости от температуры, напряжения и скорости деформации, может сти-мулировать переход от неоднородной деформации образца под нагрузкой к однородному течению [35,40]. И тем не менее есть основания полагать, что значительный нагрев образца происходит толь-ко в местах концентрации полос сдвига -вблизи микротрещин или у поверхности разрушения [39].…”

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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“…For the former, each volume element of the sample contributes to the macroscopic plastic strain [8]; for the latter, the strain is highly localized into a few nanoscale shear bands [9][10][11][12][13]. The deformation map has been subsequently extended by a number of other researchers [4,[14][15][16][17]. For example, Schuh et al [16] discovered a new regime of homogeneous flow ("Homogeneous II") that lies at the top right corner of the original deformation map of Spaepen [8].…”

Section: Introductionmentioning

confidence: 99%

“…The deformation map has been subsequently extended by a number of other researchers [4,[14][15][16][17]. For example, Schuh et al [16] discovered a new regime of homogeneous flow ("Homogeneous II") that lies at the top right corner of the original deformation map of Spaepen [8]. Furthermore, Schuh et al [4] reconstructed the deformation map that differentiates "Newtonian" and "non-Newtonian" flow in the homogeneous regime.…”

Section: Introductionmentioning

confidence: 99%

A thermoplastic forming map of a Zr-based bulk metallic glass

Chen

Jiang

et al. 2013

Acta Materialia

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A thermoplastic forming (TPF) map of a Zr 35 Ti 30 Be 26.75 Cu 8.25 bulk metallic glass was constructed through systematic hot-embossing experiments, spanning a wide range of strain rates and temperatures in the supercooled liquid region. By comparison with the corresponding deformation map, it is found that Newtonian flow, non-Newtonian flow and inhomogeneous flow regions correspond well to fully filled, partially filled and non-filled regions, respectively, in the hot-embossing TPF map. Furthermore, the spatio-temporally homogeneous flow facilitates the thermoplastic formabillity of the Zr-based bulk metallic glass, which is rationalized in terms of free volume theory as well as by finite element simulations. Finally, our results are corroborated by potential application tests.

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New regime of homogeneous flow in the deformation map of metallic glasses: elevated temperature nanoindentation experiments and mechanistic modeling

Cited by 423 publications

References 53 publications

3D nano-architected metallic glass: Size effect suppresses catastrophic failure

3D nano-architected metallic glass: Size effect suppresses catastrophic failure

Properties of Bulk Metallic Glasses

A thermoplastic forming map of a Zr-based bulk metallic glass

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