Probing the Degree of Heterogeneity within a Shear Band of a Model Glass

Hassani, Muhammad; Lagogianni, Alexandra E.; Varnik, Fathollah

doi:10.1103/physrevlett.123.195502

Cited by 43 publications

(27 citation statements)

References 57 publications

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“…Whilst the here presented data is in qualitative agreement with recent computer simulations that highlight the position-dependent complexity of strain-localization in BMGs, [76][77][78] we are far away from understanding the local mechanisms that cause these fluctuations across much larger length-scales than of short-and medium-range structural order. To overcome this hurdle with experiments does currently not seem feasible, and substantial efforts/developments in atomistic simulations are needed in view of the length scales, time scales, and the prominence of thermal activation in shear banding.…”

Section: Local Shear-band Structuresupporting

confidence: 88%

Beyond Serrated Flow in Bulk Metallic Glasses: What Comes Next?

Maaß

2020

Metall Mater Trans A

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This manuscript is based on an oral contribution to the TMS 2020 annual meeting and is dedicated to Prof. Peter Liaw, who for decades has shown great interest in serrated plastic flow. Here we will focus on the case of bulk metallic glasses, and begin with briefly summarizing some aspects of serrated and non-serrated inhomogeneous flow—a phenomenon that has perplexed materials scientists for decades. Four directions of research are identified that emerged out of the desire to fundamentally understand the intermittent inhomogeneous flow response. These research directions gear away from the phenomenological stress–strain behavior but put the underlying shear defect into focus. Unsolved problems and future research topics are discussed.

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Section: Local Shear-band Structuresupporting

confidence: 88%

Beyond Serrated Flow in Bulk Metallic Glasses: What Comes Next?

Maaß

2020

Metall Mater Trans A

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“…Whereas distinct alternating density changes were observed in the shear bands of ex situ samples produced by cold rolling [11,33,34,55] or simulation [56], the current in situ investigation did not show such alternating contrast reversals. It was mentioned above (see the Results) that bright contrast was observed in one of the shear bands, as shown in Figure 1.…”

Section: Discussioncontrasting

confidence: 87%

In Situ Generated Shear Bands in Metallic Glass Investigated by Atomic Force and Analytical Transmission Electron Microscopy

Rösner

Kuebel

Ostendorp

et al. 2022

Metals

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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, we investigated shear bands originating from in situ tensile tests of Al88Y7Fe5 melt-spun ribbons performed under a transmission electron microscope. The observed contrasts of the shear bands were found to be related to a thickness reduction rather than to density changes. This result should alert the community of the possibility of thickness changes occurring during in situ shear band formation that may affect interpretation of shear band properties such as the local density. The observation of a spearhead-like shear front suggests a propagation front mechanism for shear band initiation here.

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“…Thus, we expect that, in the present MG, the smaller species should migrate away from the central plane on shear, and that (as, we suggest, is observed) the largest species (Y) should migrate towards, or remain near, the central plane. This direction of migration is also indicated by the results of computer simulation, which showed that the areas with a larger excess volume in a sheared MG are enriched in larger atoms 52 .…”

Section: Discussionmentioning

confidence: 56%

Shear-induced chemical segregation in a Fe-based bulk metallic glass at room temperature

Louzguine‐Luzgin

Trifonov

Ivanov

et al. 2021

Sci Rep

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Shear-induced segregation, by particle size, is known in the flow of colloids and granular media, but is unexpected at the atomic level in the deformation of solid materials, especially at room temperature. In nanoscale wear tests of an Fe-based bulk metallic glass at room temperature, without significant surface heating, we find that intense shear localization under a scanned indenter tip can induce strong segregation of a dilute large-atom solute (Y) to planar regions that then crystallize as a Y-rich solid solution. There is stiffening of the material, and the underlying chemical and structural effects are characterized by transmission electron microscopy. The key influence of the soft Fe–Y interatomic interaction is investigated by ab-initio calculation. The driving force for the induced segregation, and its mechanisms, are considered by comparison with effects in other sheared media.

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Probing the Degree of Heterogeneity within a Shear Band of a Model Glass

Cited by 43 publications

References 57 publications

Beyond Serrated Flow in Bulk Metallic Glasses: What Comes Next?

Beyond Serrated Flow in Bulk Metallic Glasses: What Comes Next?

In Situ Generated Shear Bands in Metallic Glass Investigated by Atomic Force and Analytical Transmission Electron Microscopy

Shear-induced chemical segregation in a Fe-based bulk metallic glass at room temperature

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