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Incorporation of Defects into the Central Atoms Model of a Metallic Glass

Published

Author(s)

Eric Lass, Aiwu Zhu, Gary J. Shiflet, S J. Poon

Abstract

The central atoms model (CAM) of a metallic glass is extended to incorporate thermodynamically stable defects, similar to vacancies in a crystalline solid, within the amorphous structure. A bond deficiency (BD), which is the proposed defect present in all metallic glasses, is introduced into the equations of CAM. Like vacancies in a crystalline solid, BDs are thermodynamically stable entities because of the increase in entropy associated with their creation, and there will be an equilibrium concentration present in the glassy phase. When applied to Cu- and Ni-Zr binary metallic glasses, the concentration of thermally induced BDs surrounding Zr atoms reaches a relatively constant value at the glass transition temperature, regardless of composition within a given glass system. Using this “critical” defect concentration, the predicted temperatures at which the glass transition is expected to occur are in good agreement with experimentally determined glass transition temperatures for both alloy systems.
Citation
ACTA Materialia

Keywords

metallic glasses, short-range ordering, thermodynamic modeling, atomic structure, defects

Citation

Lass, E. , Zhu, A. , Shiflet, G. and Poon, S. (2011), Incorporation of Defects into the Central Atoms Model of a Metallic Glass, ACTA Materialia, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=907351 (Accessed May 18, 2024)

Issues

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Created July 17, 2011, Updated June 2, 2021