Flow and fracture in amorphous alloys

Pampillo, C. A.

doi:10.1007/bf00541403

Cited by 475 publications

(227 citation statements)

References 62 publications

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“…In addition, some smooth cores can be observed on the fracture surfaces. It has been accepted that these smooth cores correspond to local nucleation sites of the crack due to the effect of the normal tensile stress on the fracture planes [23,[42][43][44].…”

Section: Failure Modementioning

confidence: 99%

Cryogenic-temperature-induced transition from shear to dilatational failure in metallic glasses

et al. 2014

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Section: Failure Modementioning

confidence: 99%

Cryogenic-temperature-induced transition from shear to dilatational failure in metallic glasses

et al. 2014

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“…It is well known that the plastic strain of metallic glass at room temperature results from the shear displacement of two part separated by the shear band [45]. With the shear band propagating, the free volume generated will lower the bonding strength [22,46].…”

Section: Discussionmentioning

confidence: 99%

Tuning plasticity of in-situ dendrite metallic glass composites via the dendrite-volume-fraction-dependent shear banding

Liu

Chen

Jiang

et al. 2017

Materials Science and Engineering: A

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A B S T R A C TThis work performs a systematic investigation of identifying how the volume fraction of the in-situ dendrites affects the plasticity of metallic glass composites. The quasi-static uniaxial compressions show that the global plastic strain does not follows a linear rule-of-mixture with the dendrite volume faction, instead, a slow-fastslow enhancement behaviour is observed with increasing dendrite volume fraction. It is demonstrated that the nucleation and propagation of shear bands in these composites are dependent on the dendrite volume fraction. When the dendrite volume fraction exceeds a critical value, multiple shear bands emerge in a spherical plastic zone around a dendrite. It is further proposed that the percolation of these spherical plastic zones contributes to the fast increase in the plastic strain of the glass composites. Our findings offer important implications for the microstructural optimization of the metallic glass composites with desirable mechanical properties.

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“…1-5 A propagating shear band often becomes unstable, resulting in branching into subbands. [1][2][3][4][5] The mechanical properties of metallic glasses are determined by the detailed behavior of the shearband evolution. For example, a shear band starting propagating would affect yielding, or strength, and its propagation and branching would contribute to ductility as more deformation is concentrated inside the bands, absorbing more deformation energy and thus contributing to higher toughness.…”

mentioning

confidence: 99%

“…The shear localization is by far identified as the only mechanism that affects the strength, ductility, and thus application of the BMGs which otherwise have many potential applications derived from the superb properties. [1][2][3][4] Shear banding consists of three stages: nucleation, growth and propagation, and final failure; and each stage occurs on a different spatial and temporal scale. Shear-band nucleation occurs in less than microsecond and with the critical nucleation size of about 10 to several hundred nanometers, depending on the material and ambient conditions.…”

mentioning

confidence: 99%

“…Shear-band nucleation occurs in less than microsecond and with the critical nucleation size of about 10 to several hundred nanometers, depending on the material and ambient conditions. [1][2][3][4][5] Once the critical state is approached, the band could grow and propagate; the bands grow into steady state, or maturity with typical thickness of tens of nanometers to hundreds of nanometers and length of many times larger than the thickness, depending on the propagation condition. [1][2][3][4][5] A propagating shear band often becomes unstable, resulting in branching into subbands.…”

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confidence: 99%

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Mesoscopic theory of shear banding and crack propagation in metallic glasses

Zheng

2009

Phys. Rev. B

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We propose a phenomenological theory to model shear banding, shear-band propagation and branching on mesoscopic scales in metallic glasses by using Ginzburg-Landau formulism. The disordering caused by mechanical or thermal agitation is represented by atomic volume dilatation and used as an order parameter. This model captures several important features in the deformation process, namely, shear localization or banding, shear-band propagation and branching, and crack propagation and its velocity. We also assessed the relation between the crack propagation velocity and local heating and the connection between the serrated flow and shear band branching. DOI: 10.1103/PhysRevB.80.104201 PACS number͑s͒: 62.25.Mn, 46.50.ϩa, 61.43.Bn, 61.43.Fs One of the most promising developments in metallic materials in recent years is the invention of bulk metallic glasses ͑BMGs͒. 1,2 BMGs are topologically disordered solids without the long-range translational order as seen in crystalline materials. The disordered structure with atoms packed randomly leads to many unique and outstanding properties. Perhaps the most interesting is the phenomenon called shear localization: when a metallic glass subject to external load reaches the flow stress, plastic deformation occurs in narrow bands. The deformation strain inside the band is many times larger than that outside, causing samples to fail locally and quickly. The shear localization is by far identified as the only mechanism that affects the strength, ductility, and thus application of the BMGs which otherwise have many potential applications derived from the superb properties. 1-4 Shear banding consists of three stages: nucleation, growth and propagation, and final failure; and each stage occurs on a different spatial and temporal scale. Shear-band nucleation occurs in less than microsecond and with the critical nucleation size of about 10 to several hundred nanometers, depending on the material and ambient conditions. 1-5 Once the critical state is approached, the band could grow and propagate; the bands grow into steady state, or maturity with typical thickness of tens of nanometers to hundreds of nanometers and length of many times larger than the thickness, depending on the propagation condition. 1-5 A propagating shear band often becomes unstable, resulting in branching into subbands. [1][2][3][4][5] The mechanical properties of metallic glasses are determined by the detailed behavior of the shearband evolution. For example, a shear band starting propagating would affect yielding, or strength, and its propagation and branching would contribute to ductility as more deformation is concentrated inside the bands, absorbing more deformation energy and thus contributing to higher toughness. In addition, as we identify below, shear-band branching may be a major reason for the serrated flow observed during plastic deformation.The evolution exhibited in a localized shear band is a complex interplay of many factors. The initiation of a shear band is related to the local stress concentra...

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Flow and fracture in amorphous alloys

Cited by 475 publications

References 62 publications

Cryogenic-temperature-induced transition from shear to dilatational failure in metallic glasses

Cryogenic-temperature-induced transition from shear to dilatational failure in metallic glasses

Tuning plasticity of in-situ dendrite metallic glass composites via the dendrite-volume-fraction-dependent shear banding

Mesoscopic theory of shear banding and crack propagation in metallic glasses

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