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The Contribution of Matrix Plasticity to the “Frictional” Sliding of Debonded Fibers in Sapphire-Reinforced TiAl Matrix Composites

Published online by Cambridge University Press:  15 February 2011

J. M. Galbraith ,
D. A. Koss  and
J. R. Hellmann
J. M. Galbraith
Affiliation:
Structures and Controls Division, Directorate of Space and Missiles Technology, Phillips Laboratory, Edwards AFB, CA 93524-7400
D. A. Koss
Affiliation:
Center for Advanced Materials, The Pennsylvania State University, University Park, PA 16802
J. R. Hellmann
Affiliation:
Center for Advanced Materials, The Pennsylvania State University, University Park, PA 16802
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Abstract

Large-scale fiber displacement behavior, usually characterized by a “frictional” sliding stress (τslide), has been studied in two sapphire-reinforced TiAl systems. Experimental results from fiber pushout and reverse push-back tests indicate that the large-scale sliding behavior of debonded fibers leads to an average τslide-value which progressively decreases during fiber displacements. Previous studies of SCS-6 (SiC) fiber-reinforced glass and metal matrix composites have attributed decreases in τslide to the fracture and wear of fiber asperities. However, given a matrix in which fiber asperities do not easily wear (e.g., a TiAl alloy), SEM examination of the fiber/matrix interface indicates that matrix plasticity plays a dominant role in the decrease of τslide with fiber displacement. Experimental evidence suggests that the observed decrease in τslide can be attributed to (1) a decrease in fiber roughness perceived by the matrix due to matrix grooving and (2) a relaxation of radial clamping as a result of material removal from the interface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 350: Symposium U – Intermetallic Matrix Composites III , 1994 , 143
Copyright
Copyright © Materials Research Society 1994

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