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Crystallization of Glassy Powder from Aluminum-Rare Earth- Transition Metal Alloys

Published online by Cambridge University Press:  11 February 2011

A.L. Vasiliev ,
M. Aindow ,
M.J. Blackburn  and
T.J. Watson
A.L. Vasiliev
Affiliation:
Department of Metallurgy and Materials Engineering, Institute of Materials Science, University of Connecticut, Storrs, CT 06269–3136, USA.
M. Aindow
Affiliation:
Department of Metallurgy and Materials Engineering, Institute of Materials Science, University of Connecticut, Storrs, CT 06269–3136, USA.
M.J. Blackburn
Affiliation:
Department of Metallurgy and Materials Engineering, Institute of Materials Science, University of Connecticut, Storrs, CT 06269–3136, USA.
T.J. Watson
Affiliation:
Pratt & Whitney, Materials & Processes Engineering, Structural Alloys & Processes, 400 Main, Street, Mail Stop 114–40, East Hartford, CT 06108, USA
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Abstract

The microstructures exhibited by gas atomized powders of two alloys, Al-6Gd-6Ni-1Fe and Al-5Y-10Ni (at. %), have been analyzed using electron microscopy. It was found that the microstructure depends critically on the particle size obtained during atomization. Small particles (<1μm) tend to be completely amorphous. Larger particles (1–10μm) can also be amorphous, but often contain a mixture of amorphous material and crystalline Al. Three distinct morphologies are observed: nanocrystalline particles, fractal and dendritic growths embedded in an amorphous matrix. The yet larger particles (>30μm) are often fully crystalline, consisting of fine interspersed Al and intermetallic grains.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 754: Symposium CC – Supercooled Liquids, Glass Transition and Bulk Metallic Glasses , 2002 , CC11.7
Copyright
Copyright © Materials Research Society 2003

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References

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