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Microstructure and Mechanical Bevavior of Ni3Al-Matrix Composites

Published online by Cambridge University Press:  21 February 2011

P. C. Brennan ,
W. H. Kao ,
S. M. Jeng  and
J.-M. Yang
P. C. Brennan
Affiliation:
The Aerospace Corporation, P.O. Box 92957, Los Angeles, CA 90009
W. H. Kao
Affiliation:
The Aerospace Corporation, P.O. Box 92957, Los Angeles, CA 90009
S. M. Jeng
Affiliation:
University of California, Los Angeles, Department of Materials Science and Engineering, Los Angeles, CA 90024
J.-M. Yang
Affiliation:
University of California, Los Angeles, Department of Materials Science and Engineering, Los Angeles, CA 90024
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Abstract

An aluminum oxide particulate-reinforced nickel-aluminide composite was fabricated by vacuum hot pressing and hot extrusion. Room temperature three point bend tests were conducted after 1 and 100 h at 1000 °C. The composite exhibited a decrease in yield strength from 772 to 517 MPa after 100 h while the ultimate fracture stress decreased from 1174 to 998 MPa. The strain to failure increased from 4.6% to 6.0% after the same exposure. Saphikon single crystal Al2O3 fibers were used to demonstrate the materials' compatibility. The fracture surfaces of the failed composites indicated ductile failures in the matrix and decohesion between the particles and matrix.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 194: Symposium R – Intermetallic Matrix Composites I , 1990 , 169
Copyright
Copyright © Materials Research Society 1990

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