<i>In-Situ</i> Observations of Shear Band Development during Deformation of a Bulk Metallic Glass

El-Deiry, Paul; Vinci, Richard P.; Barbosa, Nicholas; Hufnagel, T. C.

doi:10.1557/proc-644-l10.2

Cited by 4 publications

(4 citation statements)

References 4 publications

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“…4(a), indicates clearly an average shear offset in the range of approximately 1 to 2.5 µm which is of the same order as that observed along a shear band in the Zr 57 Ti 5 Cu 20 Ni 8 Al 10 BMG alloys (2 to 4 µm) under uniaxial compression. 12) In recent work, the same multiple shear bands were observed around indents in glassy Zr 41.25 Ti 13.75 Cu 12.5 Ni 10 Be 22.5 during instrumented sharp indentation, conducted with a maximum load of 10 N.…”

Section: Discussionsupporting

confidence: 52%

On The Characterization of Plastic Flow in Zr-based Metallic Glass Through Micro-indentation: an Atomic Force Microscopy Analysis

Benameur¹,

Hajlaoui²,

Yavari

et al. 2002

Mater. Trans.

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We report an atomic force microscopy analysis of multiple shear bands emerged under multiaxial deformation through micro-indentations of Zr 60 Ni 10 Cu 20 Al 10 metallic glass forming system. Both relative variations of normal and lateral force components as a result of contact between a Si 3 N 4 tip mounted on a cantilever beam and incomplete circular pattern features developed around indentation are recorded at the nano and micro-length scales. Accurate three-dimensional measurements of shear offset as function of position along the shear band and the loading charge in the range of 0.5 to 5 N are determined. Evidence for propagation of discrete displacement increments is shown. Numerical calculations based on the well defined strain localization model including hydrostatic pressure effect on elastic variation of the average free volume are developed to explain the incomplete circular patterns of shear bands observed under constrained deformation.

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Section: Discussionsupporting

confidence: 52%

On The Characterization of Plastic Flow in Zr-based Metallic Glass Through Micro-indentation: an Atomic Force Microscopy Analysis

Benameur¹,

Hajlaoui²,

Yavari

et al. 2002

Mater. Trans.

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“…To investigate serrated flow, we conducted a series of in situ studies of shear band behavior, subjecting metallic glass specimens to three-point bending and uniaxial compression while simultaneously recording load-deflection data and observing the shear band morphology using an environmental scanning electron microscope (ESEM) [12,13]. Figure 5 shows a typical ESEM image of a bending specimen, with several shear bands apparent.…”

Section: Correlation Of Shear Band Behavior With Constitutive Behaviormentioning

confidence: 99%

“…We also made measurements of slip offset on shear bands, both in situ during deformation, and ex situ after testing with the goal of observing features that would indicate the occurrence of discrete slip events on individual shear bands [12,13]. We were able to rule out the existence of very large (> 1 µm) slip events, but the resolution of the in situ measurements was not good enough to allow us to observe smaller slip events.…”

Section: Correlation Of Shear Band Behavior With Constitutive Behaviormentioning

confidence: 99%

Structure and Dynamics of Shear Bands in Metallic Glasses and Nanophase Composites

Hufnagel¹

2003

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Public Reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. We have performed quantitative high-resolution transmission electron microscopy studies of the structure of shear bands in metallic glasses. We observe the formation of numerous nanometer-scale voids in shear bands produced under predominantly tensile loading. These void-like defects appear to result from the coalescence of excess free volume in the active shear band when the plastic flow ceases. By comparing the free energy of the shear band with that of the undeformed glass, we show that the void formation process is thermodynamically possible. The presence of the voids can explain several features of the mechanical behavior of metallic glasses, including the difference in plastic strain observed between tests conducted in uniaxial tension and those done in uniaxial compression.

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“…Experiments have revealed that the load drops are associated with the formation of new shear slip bands. 36,37) When the shear bands are stopped by some reasons, the load increases again. This process repeats several times until the sample fractures.…”

Section: Inhomogeneous Deformationmentioning

confidence: 99%

Deformation and Fracture Behaviors of Pd-Cu-Ni-P Glassy Alloys

Ma¹,

Inoue

2002

Mater. Trans.

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Thermal behavior and mechanical properties of Pd-based glassy alloys with compositions of Pd 35+x Cu 30 Ni 15−x P 20 (x = 0, 5, 7.5 at%, group-I) and Pd 40+x Cu 20 Ni 20−x P 20 (x = 0, 5, 10 at%, group-II) have been studied. Group-I alloys lie in an invariant eutectic reaction region of the quaternary system. The invariant eutectic reaction of L → Cu 3 Pd + Ni 2 Pd 2 P + Cu 3 Pd 5 P 2 + quaternary phosphide exists at a composition of approximately Pd 42.5 Cu 30 Ni 7.5 P 20 and at a temperature of about 800 K. Both group glasses possess a large supercooled liquid region of over 80 K before crystallization. The compressive strength, Young's modulus and Vickers hardness in each group increase with increasing Ni content. The compressive fracture strength and Young's modulus are in the range of 1610 to 1740 MPa and 100 to 110 GPa, respectively. Under a uniaxial compression mode, these glassy alloys deformed inhomogeneously and fractured adiabatically. No distinct plastic deformation was observed for group-I alloys, while group-II alloys exhibited serrated flow with a maximum plastic strain of about 1.3%.

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In-Situ Observations of Shear Band Development during Deformation of a Bulk Metallic Glass

Cited by 4 publications

References 4 publications

On The Characterization of Plastic Flow in Zr-based Metallic Glass Through Micro-indentation: an Atomic Force Microscopy Analysis

On The Characterization of Plastic Flow in Zr-based Metallic Glass Through Micro-indentation: an Atomic Force Microscopy Analysis

Structure and Dynamics of Shear Bands in Metallic Glasses and Nanophase Composites

Deformation and Fracture Behaviors of Pd-Cu-Ni-P Glassy Alloys

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