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Directional Solidification of Refractory Intermetallics: Single Crystals and Composites

Published online by Cambridge University Press:  25 February 2011

David P. Pope ,
Dilip M. Shah ,
William Romanow  and
Mark Huntley
David P. Pope
Affiliation:
University of Pennsylvania, MSE Department, 3231 Walnut St., Philadelphia, PA 19104, USA
Dilip M. Shah
Affiliation:
Pratt and Whitney, Mail Stop 114-45, 400 E. Main St., E. Hartford, CT 06108, USA
William Romanow
Affiliation:
University of Pennsylvania, MSE Department, 3231 Walnut St., Philadelphia, PA 19104, USA
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Abstract

Directional solidification of intermetallic compounds using the optical imaging floating zone technique is discussed. The advantages and disadvantages of the technique are described, and the systems to which this technique has been applied are listed. Finally, application of the technique to growing in situ Cr2Nb/Nb composites is described. It is shown that well aligned, fine microstructures can be obtained using the technique. The aspect ratio of the Cr2Nb platelets is 200:1, or better, and are a few microns thick. The Cr2Nb has a strong <220> texture along the growth axis but the Nb is nearly random.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 322: Symposium F – High-Temperature Silicides and Refractory Alloys , 1993 , 353
Copyright
Copyright © Materials Research Society 1994

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