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Issue 12, 2017
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Atomic structure of Mg-based metallic glasses from molecular dynamics and neutron diffraction

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Abstract

We use a combination of classical molecular dynamics simulation and neutron diffraction to identify the atomic structure of five different Mg–Zn–Ca bulk metallic glasses, covering a range of compositions with substantially different behaviour when implanted in vitro. There is very good agreement between the structures obtained from computer simulation and those found experimentally. Bond lengths and the total correlation function do not change significantly with composition. The zinc and calcium bonding shows differences between composition: the distribution of Zn–Ca bond lengths becomes narrower with increasing Zn content, and the preference for Zn and Ca to avoid bonding to themselves or each other becomes less strong, and, for Zn–Ca, transforms into a positive preference to bond to each other. This transition occurs at about the same Zn content at which the behaviour on implantation changes, hinting at a possible structural connection. A very broad distribution of Voronoi polyhedra are also found, and this distribution broadens with increasing Zn content. The efficient cluster packing model, which is often used to describe the structure of bulk metallic glasses, was found not to describe these systems well.

Graphical abstract: Atomic structure of Mg-based metallic glasses from molecular dynamics and neutron diffraction

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Article information


Submitted
13 May 2016
Accepted
03 Mar 2017
First published
03 Mar 2017

This article is Open Access

Phys. Chem. Chem. Phys., 2017,19, 8504-8515
Article type
Paper
Author version available

Atomic structure of Mg-based metallic glasses from molecular dynamics and neutron diffraction

A. Gulenko, L. Forto Chungong, J. Gao, I. Todd, A. C. Hannon, R. A. Martin and J. K. Christie, Phys. Chem. Chem. Phys., 2017, 19, 8504
DOI: 10.1039/C6CP03261C

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