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Simple Measurements of Toughness and Crack Formation in Several Intermetallic-Matrix Composite Systems

Published online by Cambridge University Press:  21 February 2011

Robert L. Fleischer
Robert L. Fleischer*
Affiliation:
General Electric Research and Development Center, Schenectady, NY 12301
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Abstract

Chisel-and-hammer (C.T.) and microhardness tests have been used to examine trends in toughness and crack formation in several intermetallic-based two-phase equilibrium systems. High fracture toughness, as defined by the chisel test, correlates with the presence of some ductility; and the lack of crack formation, or its limitation by a second phase in the microstructure, are prerequisites for fracture resistance. Equilibrium systems have desirable stability for use at elevated temperatures. Comparison of Tbd and C.T. is now possible for a wide range of intermetallics. Intuition suggests that Tbd and C.T. would anti-correlate. Observation, however, contradicts that hypothesis. There are significant numbers of alloys with low Tbd and low C.T. and with high Tbd and high C.T. Possible explanations are noted. Systems that have been studied include Al-Ru with Sc additions, Be-Ti, Be-Zr, Cr-Ti, with Al, Nb and Zr, Ge-Ti, Ir-Nb with Co, Fe, Ni, and V, and Ru-Ta with Co and Fe. Compositional effects on chisel toughness, hardness-vs-temperature, and crack information are presented.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 194: Symposium R – Intermetallic Matrix Composites I , 1990 , 249
Copyright
Copyright © Materials Research Society 1990

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References

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