Shear-band arrest and stress overshoots during inhomogeneous flow in a metallic glass

Maaß, R.; Klaumünzer, David; Villard, G.; Derlet, P. M.; Löffler, Jörg F.

doi:10.1063/1.3684871

Cited by 56 publications

(30 citation statements)

References 35 publications

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“…Finally, we would like to point out the connection between the supercooled liquid flow and the glassy state serrations and shear banding which could be related to localized liquid flow. [27][28][29] The facilitation effect and Eq. (2) could be useful in understanding certain aspects of serrations and shear banding.…”

Section: Discussionmentioning

confidence: 99%

Facilitation and correlation of flow in metallic supercooled liquid

Zhang

Liu

2013

The Journal of Chemical Physics

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Elucidation of the flow mechanism of the supercooled liquid near the glass transition temperature Tg is crucial for understanding the nature of glass transition. Dynamic facilitation between adjacent flow events in the supercooled liquid is believed to be crucial in the process of glass transition. In this work, it is shown that shear dilatation-based dynamic facilitation plays an important role in the supercooled liquid state of Zr58.5Cu15.6Al10.3Ni12.8Nb2.8, as revealed by the observed strain rate softening in the stress-strain curves above Tg = 684 K. Interestingly, along with strain rate softening, damped oscillations in the stress-strain curve emerge below 713 K, suggesting large-scale correlation between flow events as temperature approaches Tg. Such oscillations are absent above 713 K although strain rate softening remains even at 733 K. Analysis indicates that facilitation and correlation are both crucial for the flow of metallic supercooled liquid approaching Tg.

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Section: Discussionmentioning

confidence: 99%

Facilitation and correlation of flow in metallic supercooled liquid

Zhang

Liu

2013

The Journal of Chemical Physics

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“…A numbers of studies investigated the influence of size [22,23,24,25,26,27,28,29,30,31,32] ( i.e. , nanopillars diameter) on the deformation mode.…”

Section: Introductionmentioning

confidence: 99%

The Microstructural Evolution and Mechanical Properties of Zr-Based Metallic Glass under Different Strain Rate Compressions

Chen

Tsai

2015

Materials

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In this study, the high strain rate deformation behavior and the microstructure evolution of Zr-Cu-Al-Ni metallic glasses under various strain rates were investigated. The influence of strain and strain rate on the mechanical properties and fracture behavior, as well as microstructural properties was also investigated. Before mechanical testing, the structure and thermal stability of the Zr-Cu-Al-Ni metallic glasses were studied with X-ray diffraction (XRD) and differential scanning calorimeter. The mechanical property experiments and microstructural observations of Zr-Cu-Al-Ni metallic glasses under different strain rates ranging from 10−3 to 5.1 × 103 s−1 and at temperatures of 25 °C were investigated using compressive split-Hopkinson bar (SHPB) and an MTS tester. An in situ transmission electron microscope (TEM) nanoindenter was used to carry out compression tests and investigate the deformation behavior arising at nanopillars of the Zr-based metallic glass. The formation and interaction of shear band during the plastic deformation were investigated. Moreover, it was clearly apparent that the mechanical strength and ductility could be enhanced by impeding the penetration of shear bands with reinforced particles.

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“…Additionally, slide-hold-slide experiments have been conducted to examine the static re-strengthening effect that occurs during the stick phase of serrated flow [38,47] [34]. The upper curve (vertical scale on the left) shows the evolution of the shear stress, with periods of slow elastic loading followed by periods of rapid slip.…”

Section: Experimental Characterization Of Shear Bands In Metallicmentioning

confidence: 99%

“…In particular, we focus on the temperature and strain-rate dependence of plastic flow and aging behavior, for which a suite of experimental observations has been collected [13,[34][35][36][37][38]. We show that STZ theory with a now-incorporated temperature-dependent relaxation term captures the full range of experimental observations in a simple theoretical framework.…”

Section: Introductionmentioning

confidence: 98%

Effective temperature dynamics of shear bands in metallic glasses

2014

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We study the plastic deformation of bulk metallic glasses with shear transformation zone (STZ) theory, a physical model for plasticity in amorphous systems, and compare it with experimental data. In STZ theory, plastic deformation occurs when localized regions rearrange due to applied stress and the density of these regions is determined by a dynamically evolving effective disorder temperature. We compare the predictions of STZ theory to experiments that explore the low-temperature deformation of Zr-based bulk metallic glasses via shear bands at various thermal temperatures and strain rates. By following the evolution of effective temperature with time, strain rate, and temperature through a series of approximate and numerical solutions to the STZ equations, we successfully model a suite of experimentally observed phenomena, including shear-band aging as apparent from slide-hold-slide tests, a temperature-dependent steady-state flow stress, and a strain-rate- and temperature-dependent transition from stick-slip (serrated flow) to steady-sliding (nonserrated flow). We find that STZ theory quantitatively matches the observed experimental data and provides a framework for relating the experimentally measured energy scales to different types of atomic rearrangements.

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Shear-band arrest and stress overshoots during inhomogeneous flow in a metallic glass

Cited by 56 publications

References 35 publications

Facilitation and correlation of flow in metallic supercooled liquid

Facilitation and correlation of flow in metallic supercooled liquid

The Microstructural Evolution and Mechanical Properties of Zr-Based Metallic Glass under Different Strain Rate Compressions

Effective temperature dynamics of shear bands in metallic glasses

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