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Influence of Stoichiometry on the Strength of Nickel Beryllide

Published online by Cambridge University Press:  26 February 2011

T. G. Nieh ,
J. Wadsworth  and
C. T. Liu
T. G. Nieh
Affiliation:
Lockheed Missiles and Space Co., Inc., Research and Development Division, 0/93-10, B/204, 3251 Hanover Street, Palo Alto, CA, 94304
J. Wadsworth
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831–6115
C. T. Liu
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831–6115
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Abstract

It is demonstrated that the hardness of NiBe is dependant upon its stoichiometry; a minimum hardness is observed at the equiatomic composition. This behavior is similar to intermetallics that have the same crystallographic structure, e.g., NiAI and CoAl. The hardness increase for the off-stoichiometric compositions is a result of defect and anti-site defect structures, but may also, in part, be caused by interstitial oxygen. Nickel beryllides appear to have some intrinsic room temperature ductility, as evidenced by the absence of cracking near hardness indentations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 133: Symposium H – High-Temperature Ordered Intermetallic Alloys III , 1988 , 743
Copyright
Copyright © Materials Research Society 1989

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References

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