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Strength and Toughness of Single-Phase and Dual-Phase High-Temperature Intermetallics

Published online by Cambridge University Press:  21 February 2011

Stephen M. Bruemmer
Affiliation:
Pacific Northwest Laboratory, P.O. Box 999, Richland, WA
John L. Brimhall
Affiliation:
Pacific Northwest Laboratory, P.O. Box 999, Richland, WA
Charles H. Henager
Affiliation:
Pacific Northwest Laboratory, P.O. Box 999, Richland, WA
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Abstract

The strength and toughness of several high-temperature beryllium-niobium (Be12Nb and Be17Nb2) and iridium-niobium (lr3Nb) intermetallic compounds have been evaluated. Materials were prepared by high-rate sputter deposition and characterized by x-ray diffraction and analytical electron microscopy before and after heat treatment. As-sputtered microstructures were varied from amorphous to microcrystalline by control of substrate temperature. Grain size, degree of order, and second-phase distribution were modified by subsequent heat treatment. Strength as a function of temperature was assessed by hot hardness tests and toughness estimated from indentation-induced crack lengths. Intermetallics exhibited very high strength and low toughness up to temperatures of ˜1000 C. Mechanical behavior was a direct function of the microstructural parameters including matrix phase composition, second phase distribution, and degree of order.

Type
Research Article
Copyright
Copyright © Materials Research Society 1990

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References

1. Fleischer, R.L., J. Mat. Sci. 22, 2281 (1987).CrossRefGoogle Scholar
2. Anstis, G.R., Chantikul, P., Lawn, B.R., and Marshall, D.B., J. Am. Cer. Soc. 64, 533 (1981).CrossRefGoogle Scholar
3. Fleischer, R.L. and Zabala, R.J., Metall. Trans. 20A, 1279 (1989).CrossRefGoogle Scholar
4. Bruemmer, S.M., Brimhall, J.L., and Henager, C.H.. Jr., presented at High Temperature Aluminides and Intermetallics Symposia, 1989 TMS Fall Meeting, Indianapolis, IN. Google Scholar
5. Henager, C.H. Jr., Brimhall, J.L., and Bruemmer, S.M., submitted to Scr. Metall. (1990).Google Scholar

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