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Studies of Titanium Aluminide Composites Containing Metallic Fiber/Matrix Interface Layers

Published online by Cambridge University Press:  21 February 2011

C. G. Rhodes ,
C. C. Bampton  and
J. A. Graves
C. G. Rhodes
Affiliation:
Rockwell International Science Center, P.O. Box 1085, Thousand Oaks, CA 91358
C. C. Bampton
Affiliation:
Rockwell International Science Center, P.O. Box 1085, Thousand Oaks, CA 91358
J. A. Graves
Affiliation:
Howmet Corporation, Applied Research Division, 1500 Warner St., Whitehall, MI 49461
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Abstract

Among the more serious problems arising from the use of SiC as a reinforcement for titanium aluminides are chemical instability and thermal expansion mismatch. In this work, metallic layers (Pd + W or Pt + W) have been included in the interface between SCS6 type SiC reinforcing fibers and Ti-48A1-1V (gamma TiA1) matrix to reduce interdiffusion and to retard crack propagation. Pd reacted with the SCS layer on the SiC fibers as well as with the titanium aluminide matrix by diffusion through the W layer. Cracks were found in the resulting Pd-Ti-Al reaction product. Pt did not react with the SCS layer, and reacted with the titanium matrix only in those regions where the W layer was fractured. No cracks were present where the W layer successfully protected the matrix from the Pt. Ti and Pt reacted extensively with the underlying SiC fiber in those areas where the SCS layer was fractured.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 194: Symposium R – Intermetallic Matrix Composites I , 1990 , 349
Copyright
Copyright © Materials Research Society 1990

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References

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