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Atomistic Theory of Bulk Metallic Glass Formation

Published online by Cambridge University Press:  11 February 2011

T. Egami
T. Egami*
Affiliation:
Department of Materials Science and Engineering and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, PA 19104, USA and Lujan Center for Neutron Scattering, LANSCE, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
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Abstract

Bulk metallic glass can be formed only when the critical cooling rate for glass formation is reduced to 100–2 K/sec. However, a cooling rate achievable with molecular dynamics simulation is higher by many orders of magnitude, so the gap has to be abridged by analytical theories. We propose a theory of bulk metallic glass formation based upon our early theories of glass formation composition. The critical concepts include the idea of local glass transition, distributed local glass transition temperatures and coincident local fluctuation for atomic transport. Strong repulsion between small atoms was recognized for the first time as the necessary condition for bulk glass formation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 754: Symposium CC – Supercooled Liquids, Glass Transition and Bulk Metallic Glasses , 2002 , CC2.5
Copyright
Copyright © Materials Research Society 2003

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References

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