Journal
ACTA MATERIALIA
Volume 61, Issue 12, Pages 4474-4480Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2013.04.016
Keywords
Solidity/liquidity; Metallic glasses; Molecular dynamics; Structural anisotropy
Funding
- US National Science Foundation, Division of Materials Research [NSF-DMR-0904188]
- Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy
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Metallic glasses are viscoelastic materials that contain a wide spectrum of local configurations that range from more solid-like to more liquid-like varieties. To quantitatively characterize the local solidity (or liquidity) in metallic glasses, here we present a robust method and a universal materials parameter. The new parameter, solidity (liquidity) index, is based on the evaluation of bond orientational anisotropy. The usefulness of the proposed index in assessing the varying degrees of solidity (or liquidity) is demonstrated in metallic glass models produced via molecular dynamics simulations. The spectrum of local solidity is also analyzed in terms of its dependence on local structural features, particularly on the basis of different types of Voronoi polyhedra and atomic volume. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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