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Glass Formation and Nanostructure Development in Al-Based Alloys

Published online by Cambridge University Press:  21 February 2011

R. I. Wu ,
G. Wilde  and
J. H. Perepezko
R. I. Wu
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin-Madison, WI 53706, USA, wur@cae.wisc.edu
G. Wilde
Affiliation:
Forschungszentrum Karlsruhe INT, 76021 Kalsruhe, Germany
J. H. Perepezko
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin-Madison, WI 53706, USA
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Abstract

Al-Sm and Al-Y-Fe alloys with a high number density of nanocrystalline fcc-Al homogeneously dispersed within the amorphous matrix have been synthesized by devitrifying the precursor metallic glasses produced by rapid solidification. The kinetics of metallic glass formation and the development of the nanostructure during devitrification are discussed in terms of the rate limiting mechanism. The glass transition temperature of the two metallic glasses has been successfully assessed with the application of the modulated-temperature differential scanning calorimetry (DDSC). In addition, the formation of quenched-in nuclei was investigated by a comparison study on the cold-rolled and melt-spun Al92Sm8 amorphous samples. Furthermore, the enhancement of the particle density of the fcc-Al nanocrystals in the amorphous matrix after devitrification has been demonstrated by the incorporation of nanosize Pb particles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 581: Symposium F – Nanophase & Nanocomposite Materials II , 1999 , 101
Copyright
Copyright © Materials Research Society 2000

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References

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