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XD™ Titanium Aluminide Composites

Published online by Cambridge University Press:  22 February 2011

L. Christodoulou ,
P. A. Parrish  and
C. R. Crowe
L. Christodoulou
Affiliation:
Martin Marietta Laboratories, 1450 South Rolling Road, Baltimore, MD 21227
P. A. Parrish
Affiliation:
Defense Advanced Research Agency, 1400 Wilson Blvd., Rosslyn, VA 22209
C. R. Crowe
Affiliation:
Naval Research Laboratory, Washington, DC 20375
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Abstract

The advantages of reinforcing metals with ceramic particles to produce metal matrix composites are well known. The behavior of discontinuously reinforced intermetallic compounds, however, has not been extensively studied. Martin Marietta Laboratories has produced a new generation of discontinuously reinforced titanium aluminide composites using a proprietary casting process known as XD™ technology. These new materials possess enhanced properties at room and elevated temperatures and may be cast, extruded, or forged. The effects of matrix composition, reinforcing phase, and thermal mechanical processing on properties have been studied using optical and various electron microscopy and mechanical and physical property measurement techniques to characterize the alloys. To date, most work has been done on a two-phased lamellar Ti-45 a/o Al alloy reinforced with TiB2 ceramic having an equiaxed morphology. Data on temperature dependence of the dynamic Young's modulus, coefficient of thermal expansion, deformation and fracture behavior, and microstructure are presented.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 120: Symposium G – High-Temperature/High-Performance Composites , 1988 , 29
Copyright
Copyright © Materials Research Society 1988

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References

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