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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 ,
John L. Brimhall  and
Charles H. Henager
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
Information
MRS Online Proceedings Library (OPL) , Volume 194: Symposium R – Intermetallic Matrix Composites I , 1990 , 257
Copyright
Copyright © Materials Research Society 1990

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References

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