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Transient Deformation and Flow in Bulk Metallic Glasses and Deeply Undercooled Glass Forming Liquids — A Self-Consistent Dynamic Free Volume Model

Published online by Cambridge University Press:  11 February 2011

Sven Bossuyt ,
Marios D. Demetriou ,
William L. Johnson  and
A. Lindsay
Sven Bossuyt
Affiliation:
University of Cambridge, Department of Materials Science and Metallurgy, Pembroke Street, Cambridge CB2 3QZ, UK.
Marios D. Demetriou
Affiliation:
California Institute of Technology, Keck Laboratory of Engineering Materials 138–78, Pasadena, California 91125.
William L. Johnson
Affiliation:
California Institute of Technology, Keck Laboratory of Engineering Materials 138–78, Pasadena, California 91125.
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Abstract

Recently, a self-consistent dynamic free volume model was proposed to analyze the Newtonian and non-Newtonian uniform steady-state flow data for bulk glass forming liquids such as those of the Zr-Ti-Cu-Ni-Be Vitreloy family. The model is based on the traditional free volume model of the glass transition, the Vogel-Fulcher-Tammann (VFT) equation, and a simple treatment of free volume production and annihilation during flow. It was shown that the model results in a simple one-parameter fit to extend the VFT equation for Newtonian flow to non-Newtonian uniform steady-state flow. We further extend the model to include transient uniform flow, by considering the evolution of free volume with time.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 754: Symposium CC – Supercooled Liquids, Glass Transition and Bulk Metallic Glasses , 2002 , CC7.10
Copyright
Copyright © Materials Research Society 2003

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References

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