Size effect on stability of shear-band propagation in bulk metallic glasses: an overview

Yang, Yong; Liu, Chang

doi:10.1007/s10853-011-5915-8

Cited by 78 publications

(23 citation statements)

References 73 publications

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“…According to their experiments, Ti-based BMG samples with a smaller diameter exhibit a larger plasticity, while the strength does not markedly change. Similar results have also been reported in other BMGs [158][159][160][161][162][163]. The size effect has been explained from the viewpoints of free volume content [157,162,163], flaw sensitivity [159], plastic zone [160], and elastic energy dissipation [161].…”

Section: Poisson's Ratio Control Strategysupporting

confidence: 83%

Review on the Research and Development of Ti-Based Bulk Metallic Glasses

Gong

Deng

Jin

et al. 2016

Metals

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Abstract:Ti-based bulk metallic glasses (BMGs) are very attractive for applications because of their excellent properties such as high specific strength and high corrosion resistance. In this paper, we briefly review the current status of the research and development of Ti-based bulk metallic glasses. Emphasis is laid on glass-forming ability, mechanical properties, corrosion resistance, and biocompatibility.

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Section: Poisson's Ratio Control Strategysupporting

confidence: 83%

Review on the Research and Development of Ti-Based Bulk Metallic Glasses

Gong

Deng

Jin

et al. 2016

Metals

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“…Therefore the nucleation of shear bands in MGs will change from heterogeneous to homogeneous. [34,36,37] Below glass transition temperature T g , the shear stress required for the homogeneous nucleation of shear bands (upper line in Figure 6) is always higher than that for heterogeneous nucleation (lower line in Figure 6). For given Figure 6.…”

Section: Strength-size Relationshipmentioning

confidence: 99%

Mechanical Behavior of Micronanoscaled Metallic Glasses

Tian

Wang

Shan

2016

Materials Research Letters

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In this paper, research on the mechanical behavior of micronanoscaled metallic glasses (MGs) is reviewed, with an emphasis on works achieved through in situ transmission electron microscope. It was found that the strength of micronanoscaled MGs has a nonlinear dependence on sample size. Corresponding to the transition of size-dependent strength, the deformation mechanism of MGs changes gradually from brittle to ductile with the critical transition size being affected by strain rate, e-beam irradiation and thermal history of the sample. Besides monotonic loading, the mechanical behaviors of MGs in response to cyclic loadings and fatigue tests are also reviewed. Keywords: Metallic Glasses, Micronanoscaled, Plasticity, Strength, Cyclic LoadingIntroduction Metallic glasses (MGs), also known as amorphous metals, are materials composed of metal components but without crystalline structure.[1-3] The lack of long-range order, that is, atoms do not register in periodic lattice sites, renders MGs unique in mechanical behaviors. [4][5][6][7] Unlike crystalline metals, MGs do not have dislocation or deformation twinning as plastic carriers. When the applied mechanical load exceeds their yield strength, bulk MGs usually deform through the formation of shear band, a thin band where large shear strains localized [8], usually in a catastrophic manner. The stress level required for the nucleation and propagation of shear band is much higher than that for dislocations or twins in bulk crystalline materials, usually on the GPa level. Without early yielding, the measured elastic limit for bulk MGs can be up to 2% [4,9], much larger than their crystalline counterparts. Even though the brittleness and high cost limit the commercialization of bulk MGs, recent studies [10][11][12] demonstrated that micronanoscaled (refer to samples with their size ranged from 10 nm to 10 μm [13]) MGs own outstanding strength and reasonable plastic deformability which make them attractive for applications in Micro/Nano electro-mechanical systems (M/NEMS). Consequently, a systematic study of the mechanical properties of

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“…However, the size-dependent tensile ductility in MG system has not been fully understood [4,[16][17][18][19][20][21][22][23]. The brittle tensile fracture of macroscopic MG sample generally results from the development of a run-away shear band, which transits to a crack via shear band cavitation, causing catastrophic failure.…”

Section: Introductionmentioning

confidence: 99%

A model metallic glass exhibits size-independent tensile ductility

2016

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Metallic glasses (MGs) usually suffer brittle fracture under uniaxial tension due to size-dependent shear band cavitation. Here we developed a concurrent multi-scale simulation method to describe the uniaxial tension of a binary Lennard-Jones (BLJ) model glass up to 88 microns in length. No cavitation or brittle fracture was found even for the longest BLJ sample. As the length increases, the shear band temperature increases, then saturates, while the elastic unloading from shear-off diminishes. We conjecture that the shear band of a BLJ sample, even with a macroscopic length, cannot reach the herein estimated critical cavitation conditions. Thus, BLJ samples appear to be free of size-induced tensile brittleness. Based on the shear band evolution and the critical cavitation conditions, we propose three classes of MGs in terms of tensile ductility: brittle-MGs (brittle for all lengths), normal-MGs (ductile for short samples, brittle for long samples), cohesive-MGs (ductile for all lengths). Our simulation results illustrate limitations of existing molecular models, and suggest that certain experimental metallic glasses may be free of size-induced tensile brittleness.

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Size effect on stability of shear-band propagation in bulk metallic glasses: an overview

Cited by 78 publications

References 73 publications

Review on the Research and Development of Ti-Based Bulk Metallic Glasses

Review on the Research and Development of Ti-Based Bulk Metallic Glasses

Mechanical Behavior of Micronanoscaled Metallic Glasses

A model metallic glass exhibits size-independent tensile ductility

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