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Strength and Toughness of Composite Materials Based on Nickel Aluminide Matrices

Published online by Cambridge University Press:  26 February 2011

J. D. Rigney ,
P. S. Khadkikar ,
J. J. Lewandowski  and
K. Vedula
J. D. Rigney
Affiliation:
Department of Materials Science and Engineering, Case Western Reserve UniversityCleveland, OH 44106
P. S. Khadkikar
Affiliation:
Department of Materials Science and Engineering, Case Western Reserve UniversityCleveland, OH 44106
J. J. Lewandowski
Affiliation:
Department of Materials Science and Engineering, Case Western Reserve UniversityCleveland, OH 44106
K. Vedula
Affiliation:
Department of Materials Science and Engineering, Case Western Reserve UniversityCleveland, OH 44106
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Abstract

Several nickel aluminide matrix composites were prepared using vacuum hot pressing techniques. The matrix compositions, based on Ni3Al, Ni3Al+B and NiAl, were reinforced with 10 volume % TiB2 particles. Both smooth and notched bend tests were conducted at room temperature on the monolithic as well as the reinforced materials in order to determine the effects of TiB2 reinforcement on both the smooth bend and notched bend properties. TiB2 additions were shown to improve the smooth bend strengths regardless of the matrix composition while notched bend tests, conducted to provide estimates of fracture toughness, revealed somewhat lower values for the composites in comparison to the monolithic materials. Fractographic analyses and in-situ fracture observations of the composites revealed that preferential fracture in regions of clustered TiB2 particles may significantly affect the measured toughnesses.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 133: Symposium H – High-Temperature Ordered Intermetallic Alloys III , 1988 , 603
Copyright
Copyright © Materials Research Society 1989

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References

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