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Deformation of an extruded nickel beryllide between room temperature and 820 °C

Published online by Cambridge University Press:  31 January 2011

G.M. Pharr ,
S.V. Courington ,
J. Wadsworth  and
T.G. Nieh
G.M. Pharr
Affiliation:
Department of Materials Science, Rice University, P.O. Box 1892, Houston, Texas 77251
S.V. Courington
Affiliation:
Department of Materials Science, Rice University, P.O. Box 1892, Houston, Texas 77251
J. Wadsworth
Affiliation:
Lockheed Missiles & Space Company, Inc., O/9310, B/204, 3251 Hanover Street, Palo Alto, California 94304
T.G. Nieh
Affiliation:
Lockheed Missiles & Space Company, Inc., O/9310, B/204, 3251 Hanover Street, Palo Alto, California 94304
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Abstract

The mechanical properties of nickel beryllide, NiBe, have been investigated in the temperature range 20–820 °C. The room temperature properties were studied using tension, bending, and compression tests, while the elevated temperature properties were characterized in compression only. NiBe exhibits some ductility at room temperature; the strains to failure in tension and compression are 1.3% and 13%, respectively. Fracture is controlled primarily by the cohesive strength of grain boundaries. At high temperatures, NiBe is readily deformable—strains in excess of 30% can be achieved at temperatures as low as 400 °C. Strain hardening rates are high, and the flow stress decreases monotonically with temperature. The high temperature strength of NiBe is as good or better than that of NiAl, but not quite as good as CoAl.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 12 , December 1991 , pp. 2653 - 2659
Copyright
Copyright © Materials Research Society 1991

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