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Effect of the Supercooled Liquid Region on Al85Ni7Gd8 Metallic Glass Crystallization Products

Published online by Cambridge University Press:  11 February 2011

F. Q. Guo ,
S. J Poon  and
G. J. Shiflet
F. Q. Guo
Affiliation:
Department of Physics,, University of Virginia1, Charlottesville, Va 22903, U.S.A.
S. J Poon
Affiliation:
Department of Physics,, University of Virginia1, Charlottesville, Va 22903, U.S.A.
G. J. Shiflet
Affiliation:
Department of Materials Science and Engineering, University of Virginia1, Charlottesville, Va 22903, U.S.A.
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Abstract

The effect of the supercooled liquid region on the primary crystallization of Al85Ni7Gd8 metallic glass, which exhibits a clear glass transition before its primary crystallization, was evaluated systematically under different annealing conditions, including isothermal annealing at different temperatures and non-isothermal annealing employing different heating rates. It was found that isothermal annealing within the supercooled liquid region and non-isothermal annealing at small heating rates (≤ 5 °C/min) result in the co-precipitation of fcc-Al and Al compound(s). When isothermal annealing is done at temperatures where partial crystallization is involved, or non-isothermal annealing is carried out at a larger heating rate, the primary crystallization product is a single phase of fcc-Al. The effect of the supercooled liquid region on the crystallization product is discussed in detail.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 754: Symposium CC – Supercooled Liquids, Glass Transition and Bulk Metallic Glasses , 2002 , CC11.6
Copyright
Copyright © Materials Research Society 2003

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References

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