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Open AccessFeature PaperArticle

Shear Bands Topology in the Deformed Bulk Metallic Glasses

1
Institute of Materials Engineering, Technische Universität Bergakademie Freiberg, 09599 Freiberg, Germany
2
Department of Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology - NTNU, 7491 Trondheim, Norway
*
Author to whom correspondence should be addressed.
Metals 2020, 10(3), 374; https://doi.org/10.3390/met10030374
Received: 18 February 2020 / Revised: 11 March 2020 / Accepted: 12 March 2020 / Published: 14 March 2020
(This article belongs to the Special Issue Recent Advancements in Metallic Glasses)
Recent experimental studies revealed the presence of Volterra dislocation-type long-range elastic strain/stress field around a shear band (SB) terminated in a bulk metallic glass (BMG). The corollary from this finding is that shear bands can interact with these stress fields. In other words, the mutual behaviour of SBs should be affected by their stress fields superimposed with the external stresses. In order to verify this suggestion, the topography of the regions surrounding SBs terminated in the BMGs was carefully analysed. The surfaces of several BMGs, deformed by compression and indentation, were investigated with a high spatial resolution by means of scanning white-light interferometry (SWLI). Along with the evidence for the interaction between SBs, different scenarios of the SB propagation have been observed. Specifically, the SB path deviation, mutual blocking, and deflection of SBs were revealed along with the significant differences between the topologies of the mode II (in-plane) and mode III (out of plane) SBs. While the type II shear manifests a linear propagation path and a monotonically increasing shear offset, the type III shear is associated with a curved, segmented path and a non-monotonically varying shear offset. The systematic application of the “classic” elastic Volterra’s theory of dislocations to the behaviour of SBs in BMGs provides new insight into the widely reported experimental phenomena concerning the SB morphology, which is further detailed in the present work. View Full-Text
Keywords: bulk metallic glass; shear band; dislocation theory; scanning white light interferometry bulk metallic glass; shear band; dislocation theory; scanning white light interferometry
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MDPI and ACS Style

Seleznev, M.; Vinogradov, A. Shear Bands Topology in the Deformed Bulk Metallic Glasses. Metals 2020, 10, 374.

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