Size distribution of shear transformation zones and. their evolution towards the formation of shear bands in metallic glasses

Zhong, C and Zhang, H and Cao, QP and Wang, XD and Zhang, DX and Ramamurty, U and Jiang, JZ (2016) Size distribution of shear transformation zones and. their evolution towards the formation of shear bands in metallic glasses. In: JOURNAL OF NON-CRYSTALLINE SOLIDS, 445 . pp. 61-68.

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Abstract

The room temperature tensile deformation behavior of two metallic glasses (MGs), Cu64Zr36 and Cu40Zr60, was investigated, by employing molecular dynamics simulations, with a view to examine the evolution of plastic deformation at the atomistic scale. It was found that after reaching the maximum stress, atoms in areas with lower packing efficiency, which have liquid-like polyhedral atomic configurations, exhibit larger displacement. On further deformation, the atoms in rigidly packed regions, which have solid-like polyhedral atomic configurations, also start partaking in the plastic deformation, especially within the shear band region. The average shear transformation zone (STZ) size, defined by the coordination neighborhood of highly strained atoms, was found to increase from 17 +/- 3 to 106 +/- 6 atoms within the strain range of 7-12%, which spans the shear band initiation to mature formation, in both MGs examined. A detailed examination of the distributions of the number and the size of STZs as a function of strain reveals that the formation of the shear band is linked with the occurrence of a few super-sized STZs. (C) 2016 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	JOURNAL OF NON-CRYSTALLINE SOLIDS
Publisher:	ELSEVIER SCIENCE BV
Additional Information:	Copy right for this article belongs to the ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Keywords:	Shear transformation zone; Shear band; Metallic glasses; Molecular dynamics simulations
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	19 Aug 2016 06:33
Last Modified:	19 Aug 2016 06:33
URI:	http://eprints.iisc.ac.in/id/eprint/54392

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