Temperature Rise Inside Shear Bands in a Simple Model Glass

One of the key factors, which hampers the application of metallic glasses as structural components, is the localization of deformation in narrow bands of a few tens up to one hundred nanometers thickness, the so-called shear bands. Processes, which occur inside shear bands are of central importance...

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Main Authors: Alexandra E. Lagogianni, Fathollah Varnik
Format: Article
Language:English
Published: MDPI AG 2022-10-01
Series:International Journal of Molecular Sciences
Subjects:
Online Access:https://www.mdpi.com/1422-0067/23/20/12159
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author Alexandra E. Lagogianni
Fathollah Varnik
author_facet Alexandra E. Lagogianni
Fathollah Varnik
author_sort Alexandra E. Lagogianni
collection DOAJ
description One of the key factors, which hampers the application of metallic glasses as structural components, is the localization of deformation in narrow bands of a few tens up to one hundred nanometers thickness, the so-called shear bands. Processes, which occur inside shear bands are of central importance for the question whether a catastrophic failure of the material is unavoidable or can be circumvented or, at least, delayed. Via molecular dynamics simulations, this study addresses one of these processes, namely the local temperature rise due to viscous heat generation. The major contribution to energy dissipation is traced back to the plastic work performed by shear stress during steady deformation. Zones of largest strain contribute the most to this process and coincide with high-temperature domains (hottest spots) inside the sample. Magnitude of temperature rise can reach a few percent of the sample’s glass transition temperature. Consequences of these observations are discussed in the context of the current research in the field.
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spelling doaj.art-5e4f6898537f40cf8976895496b6aba82023-12-03T14:46:38ZengMDPI AGInternational Journal of Molecular Sciences1661-65961422-00672022-10-0123201215910.3390/ijms232012159Temperature Rise Inside Shear Bands in a Simple Model GlassAlexandra E. Lagogianni0Fathollah Varnik1Interdisciplinary Centre for Advanced Materials Simulation (ICAMS), Ruhr-University Bochum, Universitätsstraße 150, 44801 Bochum, GermanyInterdisciplinary Centre for Advanced Materials Simulation (ICAMS), Ruhr-University Bochum, Universitätsstraße 150, 44801 Bochum, GermanyOne of the key factors, which hampers the application of metallic glasses as structural components, is the localization of deformation in narrow bands of a few tens up to one hundred nanometers thickness, the so-called shear bands. Processes, which occur inside shear bands are of central importance for the question whether a catastrophic failure of the material is unavoidable or can be circumvented or, at least, delayed. Via molecular dynamics simulations, this study addresses one of these processes, namely the local temperature rise due to viscous heat generation. The major contribution to energy dissipation is traced back to the plastic work performed by shear stress during steady deformation. Zones of largest strain contribute the most to this process and coincide with high-temperature domains (hottest spots) inside the sample. Magnitude of temperature rise can reach a few percent of the sample’s glass transition temperature. Consequences of these observations are discussed in the context of the current research in the field.https://www.mdpi.com/1422-0067/23/20/12159metallic glassshear bandingplastic deformationviscous heatingmolecular dynamics simulation
spellingShingle Alexandra E. Lagogianni
Fathollah Varnik
Temperature Rise Inside Shear Bands in a Simple Model Glass
International Journal of Molecular Sciences
metallic glass
shear banding
plastic deformation
viscous heating
molecular dynamics simulation
title Temperature Rise Inside Shear Bands in a Simple Model Glass
title_full Temperature Rise Inside Shear Bands in a Simple Model Glass
title_fullStr Temperature Rise Inside Shear Bands in a Simple Model Glass
title_full_unstemmed Temperature Rise Inside Shear Bands in a Simple Model Glass
title_short Temperature Rise Inside Shear Bands in a Simple Model Glass
title_sort temperature rise inside shear bands in a simple model glass
topic metallic glass
shear banding
plastic deformation
viscous heating
molecular dynamics simulation
url https://www.mdpi.com/1422-0067/23/20/12159
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