Plastic deformability of metallic glass by artificial macroscopic notches

Zhao, Jiaxi; Wu, F. F.; Qu, R.T.; Li, S. X.; Zhang, Z. F.

doi:10.1016/j.actamat.2010.06.017

Cited by 74 publications

(49 citation statements)

References 52 publications

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“…It appears from the linear elastic fracture mechanics (LEFM) that notches and flaws will reduce the strength of BMGs as in other brittle solids. However, recent studies have reported a diverse variety of observations on notched BMGs [1][2][3][4][5][6][7][8]. As summarized in Pan et al [7] and shown in the geometric setup in Fig.…”

Section: Introductionmentioning

confidence: 99%

Effects of geometric factors and shear band patterns on notch sensitivity in bulk metallic glasses

Bei

Gao

2016

Intermetallics

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Recent experiments in notched bulk metallic glasses have found reduced, or insensitive, or improved strengths, while in many of these cases the ductile strain prior to final failure is enhanced. First, although the inverse notch effect is explained by a shift from shear localization to cavitation failure, it is suggested in this work that the synergistic effect between cohesive fracture at the notched area and shear bands emanating from the notch roots may extend the parametric space for the notch insensitive behavior. Second, the dependence of shear band patterns on notch geometric factors is determined by the Rudnicki-Rice theory and the freevolume-based finite element simulations. These results suggest conditions for shear band multiplication to take place and for the shear-localization-induced failure to be delayed.

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Section: Introductionmentioning

confidence: 99%

Effects of geometric factors and shear band patterns on notch sensitivity in bulk metallic glasses

Bei

Gao

2016

Intermetallics

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“…2 displays the engineering compressive stress-strain curves of specimens A, B, C, D and E. Here, we apply an engineering stress, i.e. the ratio of the applied force to the minimum bearing area of the specimen, to represent the global stress since the stress distributions in the specimens with arc-shaped edges are non-uniform [24][25][26][27]. As shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…But for metallic glass, it was reported that the hydrostatic stress might have significant effects on the yielding behavior of metallic glass [19,26,38,[42][43][44], especially under large stress gradient conditions. As shown in Fig.…”

Section: Yielding and Flow Modelingmentioning

confidence: 98%

On the stress-state dependent plasticity of brittle metallic glasses: Experiment, theory and simulation

Zhao

Zhang

2013

Materials Science and Engineering: A

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“…In this work, we use an ideal elastic-plastic constitutive model to simulate the evolution of the yield regions of the notched specimens during tensile testing. Although such model cannot capture the formation and propagation of shear bands, it is good to characterize evolution of yield regions where shear bands are formed3260.…”

Section: Methodsmentioning

confidence: 99%

Flaw-induced plastic-flow dynamics in bulk metallic glasses under tension

Chen

Yue

Tsui

et al. 2016

Sci Rep

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Inheriting amorphous atomic structures without crystalline lattices, bulk metallic glasses (BMGs) are known to have superior mechanical properties, such as high strength approaching the ideal value, but are susceptible to catastrophic failures. Understanding the plastic-flow dynamics of BMGs is important for achieving stable plastic flow in order to avoid catastrophic failures, especially under tension, where almost all BMGs demonstrate limited plastic flow with catastrophic failure. Previous findings have shown that the plastic flow of BMGs displays critical dynamics under compression tests, however, the plastic-flow dynamics under tension are still unknown. Here we report that power-law critical dynamics can also be achieved in the plastic flow of tensile BMGs by introducing flaws. Differing from the plastic flow under compression, the flaw-induced plastic flow under tension shows an upward trend in the amplitudes of the load drops with time, resulting in a stable plastic-flow stage with a power-law distribution of the load drop. We found that the flaw-induced plastic flow resulted from the stress gradients around the notch roots, and the stable plastic-flow stage increased with the increase of the stress concentration factor ahead of the notch root. The findings are potentially useful for predicting and avoiding the catastrophic failures in tensile BMGs by tailoring the complex stress fields in practical structural-applications.

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Plastic deformability of metallic glass by artificial macroscopic notches

Cited by 74 publications

References 52 publications

Effects of geometric factors and shear band patterns on notch sensitivity in bulk metallic glasses

Effects of geometric factors and shear band patterns on notch sensitivity in bulk metallic glasses

On the stress-state dependent plasticity of brittle metallic glasses: Experiment, theory and simulation

Flaw-induced plastic-flow dynamics in bulk metallic glasses under tension

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