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Comparison between thermal and deformation-induced structural relaxation in atomic glasses

Published online by Cambridge University Press:  11 February 2011

Magesh Nandagopal  and
Marcel Utz
Magesh Nandagopal
Affiliation:
Institute of Materials Science, University of Connecticut, Storrs CT 06269, USA
Marcel Utz
Affiliation:
Institute of Materials Science, University of Connecticut, Storrs CT 06269, USA Department of Physics, University of Connecticut, Storrs CT 06269, USA
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Abstract

Plastic yielding in glassy solids has been interpreted as a strain-biased relaxation process, or, equivalently, as a strain-induced glass transition. In the present work, the atomic motions caused by athermal plastic deformation of a binary Lennard-Jones glass are compared to thermal motion in the liquid in terms of the self part of the intermediate structure factor. We find that like at finite temperature, athermal plastic deformation leads to diffusive atomic motion at all length scales beyond about one interatomic distance, effectively promoting structural relaxation. The present approach allows to study the interplay of deformation-induced and thermal relaxation. Preliminary evidence is presented that these two processes occur independently of each other over a wide range of strain rates.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 754: Symposium CC – Supercooled Liquids, Glass Transition and Bulk Metallic Glasses , 2002 , CC4.5
Copyright
Copyright © Materials Research Society 2003

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