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Reaction Zone Growth in Ti-Base/SiC Composites

Published online by Cambridge University Press:  21 February 2011

Ann M. Ritter ,
Ernest L. Hall  and
Nathan Lewis
Ann M. Ritter
Affiliation:
GE Corporate Research & Development, P.O. Box 8, Schenectady, NY 12301
Ernest L. Hall
Affiliation:
GE Corporate Research & Development, P.O. Box 8, Schenectady, NY 12301
Nathan Lewis
Affiliation:
GE Corporate Research & Development, P.O. Box 8, Schenectady, NY 12301
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Abstract

Reaction zone phases and kinetics over a temperature range of 650-1200°C have been characterized for Ti-14Al-21Nb/SiC and Ti-6Al-2Sn-4Zr-2Mo/SiC fibrous composites. The matrix of the Ti-1421/SiC materials was α2 with varying amounts of beta phase and transformed beta phase, and the Ti-6242 matrix consisted of alpha plus beta. The reaction zone in the as-HIP Ti-1421/SiC contained fine-grained TiC, a region of coarser-grained TiC, a carbide layer containing Ti, Al and Nb, and a region of(Ti, Nb)5(Si, Al)3. The matrix adjacent to the reaction zone was α2-Ti3Al with no beta phase. In the as-HIP Ti-6242/SiC composites, the reaction zone contained TiC near the fiber, and a layer of (Ti,Zr)5Si3 adjacent to the matrix. In heat-treated samples, the reaction zone thicknesses varied in a linear fashion with the square-root of aging time, indicating diffusion-controlled growth. Incubation periods for reaction zone growth were observed in Ti-1421/SiC samples aged at 760-1000°C. The overall kinetics for the two matrix alloys were approximately the same, and the activation energy was measured as 63-73 kcal/mole for Ti-1421/SiC and 73kcal/mole for Ti-6242/SiC.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 194: Symposium R – Intermetallic Matrix Composites I , 1990 , 413
Copyright
Copyright © Materials Research Society 1990

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