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Axial Alignment of Short-Fiber Titanium Aluminide Composites by Directional Solidification

Published online by Cambridge University Press:  21 February 2011

S. L. Kampe ,
G. H. Swope  and
L. Christodoulou
S. L. Kampe
Affiliation:
Martin Marietta Laboratories 1450 S. Rolling Road Baltimore, Maryland 21227
G. H. Swope
Affiliation:
Martin Marietta Laboratories 1450 S. Rolling Road Baltimore, Maryland 21227
L. Christodoulou
Affiliation:
Martin Marietta Laboratories 1450 S. Rolling Road Baltimore, Maryland 21227
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Abstract

The floating zone directional solidification technique has been applied to an XDTM short-fiber-reinforced titanium aluminide ingot in an effort to produce in situ alignment of the reinforcement. Microstructural evaluation reveals that a general alignment of the high aspect ratio (>100:1) fibers occurs under specific imposed solidification conditions. These metallographic observations are supported by 800 ° C mechanical data, which indicate higher axial and reduced transverse strengths relative to the unprocessed base material which contains a dispersion of randomly oriented fibers. The increased strengths are observed to be a consequence of an increase in the matrix hardening due to accommodation of plastic strain around the fiber reinforcement.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 194: Symposium R – Intermetallic Matrix Composites I , 1990 , 97
Copyright
Copyright © Materials Research Society 1990

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References

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