On the shear-affected zone of shear bands in bulk metallic glasses

Davani, Farnaz A.; Hilke, Sven; Rösner, Harald; Geißler, David; Gebert, A.; Wilde, Gerhard

doi:10.1016/j.jallcom.2020.155494

Cited by 27 publications

(10 citation statements)

References 33 publications

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“…3b) with respect to the "as-cast" (black data points in Fig. 3a) state has mainly increased within the plateaus, while a decrease in relative MRO volume fraction was observed for less severely deformed BMGs 23,46 . However, the two sample states which have been rapidly quenched from the exothermic peak (orange and brown data points in Fig.…”

Section: Fluctuation Electron Microscopymentioning

confidence: 90%

“…FEM is a microscopic technique which has been shown to be sensitive to higher order correlation functions such as g 3 and g 4 and hence to MRO in disordered materials 7,8,20,23,[26][27][28][29][30][31]46 . A statistical analysis of the diffracted intensities I( k, R, r) from nanometer-sized volumes was used by utilizing STEM microdiffraction 25 , where k is the scattering vector, R is the probe size and r is the position on the sample.…”

Section: Methodsmentioning

confidence: 99%

“…3a reveals two "plateaus" in accordance with Refs. 8,46,54 . In comparison to the "as-cast" and "as-cast + annealed 561 K for 2 h" states (see Fig.…”

Section: Fluctuation Electron Microscopymentioning

confidence: 99%

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Impact of Severe Deformation by HPT at Room Temperature on the Relaxation of the Glassy and the Supercooled Liquid States of PdNiP

et al. 2019

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The impact of severe plastic deformation by high-pressure torsion on the relaxation of the glassy and supercooled liquid states of Pd 40 Ni 40 P 20 was investigated using a combination of differential scanning calorimetry, low-temperature heat capacity and fluctuation electron microscopy. The changes in the calorimetric signals due to deformation and subsequent heat treatments were analyzed and a correlation between deformation (rejuvenation) and annealing (relaxation) was found in relation to medium-range order (MRO). Moreover, a coupling between the occurrence of an exothermic peak in the supercooled liquid state and specific changes in the MRO types were identified. These findings are comprehended in a potential energy landscape scheme offering a new approach for MRO engineering of glasses.

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Section: Fluctuation Electron Microscopymentioning

confidence: 90%

Section: Methodsmentioning

confidence: 99%

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Impact of Severe Deformation by HPT at Room Temperature on the Relaxation of the Glassy and the Supercooled Liquid States of PdNiP

et al. 2019

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“…Comprehensive MRO studies on the PdNiP system using the current setup were recently reported in Hilke et al (2020) and Davani et al (2020aDavani et al ( , 2020b.…”

Section: System Ii: Pdnip Metallic Glassmentioning

confidence: 99%

Comparison of Experimental STEM Conditions for Fluctuation Electron Microscopy

et al. 2020

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“…1b) is thus accounted for by the thin foil allowing volume increase due to shear deformation to annihilate via the free surfaces of the thin foil and the sheared zones to expand in width. Moreover, since the observed deformation behavior correlates with granular materials or jammed systems, it seems appropriate to presume that short-or medium-range atomic clusters act like granules enabling the volume to increase by deformation [17,35,37,38,47,[65][66][67].…”

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confidence: 99%

A comparison of in- and ex situ generated shear bands in metallic glass by transmission electron microscopy

Rösner,

Kübel,

Ostendorp

et al. 2021

Preprint

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Plastic deformation of metallic glasses performed at temperatures well below the glass transition proceeds via the formation of shear bands. In this contribution shear bands originating from in situ tensile tests of Al 88 Y 7 Fe 5 melt-spun ribbons conducted in a transmission electron microscope are compared with ones which had formed ex situ during cold rolling. The observed contrasts for shear bands generated in situ at the edges of thin electron-transparent foils are shown to be related to a meniscus-like foil thickness reduction. In comparison with ex situ samples, alternating contrast changes due to volume changes are missing and the shear band width is a factor of 15 larger. The meniscus-like shear band profile is accounted for by the thin foil allowing volume increase due to shear deformation to annihilate via the free surfaces of the thin foil and the sheared zones to widen.

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On the shear-affected zone of shear bands in bulk metallic glasses

Cited by 27 publications

References 33 publications

Impact of Severe Deformation by HPT at Room Temperature on the Relaxation of the Glassy and the Supercooled Liquid States of PdNiP

Impact of Severe Deformation by HPT at Room Temperature on the Relaxation of the Glassy and the Supercooled Liquid States of PdNiP

Comparison of Experimental STEM Conditions for Fluctuation Electron Microscopy

A comparison of in- and ex situ generated shear bands in metallic glass by transmission electron microscopy

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