Interfacial shear behavior of sapphire-reinforced NiAl compositesThe interfacial shear behavior in near-equiatomic NiAl reinforced by sapphire filaments has been examined at room temperature using a fiber pushout test technique. The load-displacement 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.
Document ID
19920064239
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Moose, C. A. (NASA Headquarters Washington, DC United States)
Koss, D. A. (NASA Headquarters Washington, DC United States)
Hellmann, J. R. (Pennsylvania State University University Park, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1990
Subject Category
Metallic Materials
Meeting Information
Meeting: MRS Symposium on Intermatallic Matrix Composites