Elevated temperature slow plastic deformation of NiAl/TiB2 particulate compositesThe 'XD' process for production of discontinuously-reinforced metal-matrix composites has been used to enhance the high-temperature strength of NiAl-TiB2 composites with particulate densities of up to 30 vol pct. SEM, TEM, and optical characterizations of the resulting microstructures showed the average TiB2 particle size to be about 1 micron, while the average grain of the NiAl matrix was of the order of 10 microns. Elevated temperature compression tests conducted at 1200 and 1300 K indicated flow strengths to increase with TiB2 content, so that the 20 vol pct TiB2-reinforced composite was three times stronger than the unreinforced NiAl; this is ascribed to the very high density of microstructural tangled dislocations, loops, and subgrain boundaries connecting the particles.
Document ID
19890044318
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Whittenberger, J. Daniel (NASA Lewis Research Center Cleveland, OH, United States)
Mannan, S. K. (NASA Lewis Research Center Cleveland, OH, United States)
Sprissler, B. (Martin Marietta Laboratories Baltimore, MD, United States)
Viswanadham, R. K. (Multi-Metals Louisville, KY, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1988
Subject Category
Composite Materials
Meeting Information
Meeting: High Temperature/High Performance Composites