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Interfacial Shear Behavior of Sapphire-Reinforced NiAi Composites

Published online by Cambridge University Press:  21 February 2011

C. A. Moose ,
D. A. Koss  and
J. R. Hellmann
C. A. Moose
Affiliation:
Center for Advanced Materials The Pennsylvania State University University Park, PA 16802
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

The interfacial shear behavior in near-equiatomic NiA1 reinforced by sapphire filaments has been examined at room temperature using a fiber pushout test technique. The loaddisplacement data indicate a large variability in the initial interface failure stress, although reverse push behavior indicates a comparatively constant interfacial sliding friction stress. The observed behavior suggests that the presence of asperities on the fiber surfaces and nonuniformities in fiber diameter require constrained plastic flow within the NiAl matrix in order for interfacial shear to occur. The location, shape, severity, and distribution of fiber asperities as well as the uniformity of fiber diameter are critical to the interfacial shear process.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 194: Symposium R – Intermetallic Matrix Composites I , 1990 , 293
Copyright
Copyright © Materials Research Society 1990

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