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On Relaxation Kinetics in Liquid and Glassy Ag-Cu Metallic Alloy

Published online by Cambridge University Press:  11 February 2011

Alexander S. Bakai ,
Nikolai P. Lazarev  and
Kia L. Ngai
Alexander S. Bakai
Affiliation:
National Science Center Kharkov Institute of Physics and Technology, 61108 Kharkov, Ukraine
Nikolai P. Lazarev
Affiliation:
National Science Center Kharkov Institute of Physics and Technology, 61108 Kharkov, Ukraine
Kia L. Ngai
Affiliation:
National Science Center Kharkov Institute of Physics and Technology, 61108 Kharkov, Ukraine
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Abstract

Molecular dynamics simulations of structure, thermodynamic and kinetic properties of model metallic AgCu alloy are performed to elucidate its behavior at glass transition. In spite of small variations of inherent structure of the alloy the relaxation kinetics undergo dramatic changes at the glass transition. The time dependences of the mean square displacements and the non-Gaussianity parameter show the signatures of anomalous diffusion in an intermediate time region. Analysis of time evolution of van Hove correlation function indicates the existence both jump displacements and short-range cooperative atomic rearrangements. Below Tg these cooperative rearrangements do not contribute to long-range diffusion but they still dominate the relaxation at short time.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 754: Symposium CC – Supercooled Liquids, Glass Transition and Bulk Metallic Glasses , 2002 , CC6.17
Copyright
Copyright © Materials Research Society 2003

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