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Medium-Range Order in High Al-content Amorphous Alloys Measured by Fluctuation Electron Microscopy

Published online by Cambridge University Press:  01 February 2011

W. G. Stratton,
J. Hamann,
J. H. Perepezko and
P. M. Voyles
W. G. Stratton
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin – Madison, 1509 University Avenue, Madison, WI 53706, U.S.A.
J. Hamann
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin – Madison, 1509 University Avenue, Madison, WI 53706, U.S.A.
J. H. Perepezko
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin – Madison, 1509 University Avenue, Madison, WI 53706, U.S.A.
P. M. Voyles
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin – Madison, 1509 University Avenue, Madison, WI 53706, U.S.A.
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Abstract

We have used fluctuation electron microscopy (FEM) to measure nanoscale mediumrange order in amorphous Al92Sm8. Samples of this amorphous alloy formed by rapid quenching (melt-spinning) show a high density of pure Al nanocrystals (>1020 m-3) after low temperature (< 250 °C) devitrification. In samples amorphized by deformation (cold-rolling), primary Al-crystallization does not occur. This difference in devitrification behavior suggests an underlying structural difference in the amorphous state. FEM is a quantitative microscopy technique for determining nanoscale medium-range order in amorphous materials. Our measurements show that amorphous alloys formed by melt-spinning and cold-rolling have significant structural differences, and that annealing melt-spun alloy under conditions previously shown to modify the devitrification thermodynamics also changes the medium-range structure.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 806: Symposium MM – Amorphous and Nanocrystalline Metals , 2003, MM9.4
Copyright
Copyright © Materials Research Society 2004

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