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Creep of a niobium beryllide, Nb2Be17

Published online by Cambridge University Press:  31 January 2011

T.G. Nieh ,
J. Wadsworth ,
T.C. Chou ,
D. Owen  and
A.H. Chokshi
T.G. Nieh
Affiliation:
Lawrence Livermore National Laboratory, L-350, P.O. Box 808, Livermore, California 94550
J. Wadsworth
Affiliation:
Lawrence Livermore National Laboratory, L-350, P.O. Box 808, Livermore, California 94550
T.C. Chou
Affiliation:
Lockheed, OI93-10, B/204, 3251 Hanover Street, Palo Alto, California 94304-1191
D. Owen
Affiliation:
Department of Applied Mechanics and Engineering Sciences, University of California, San Diego, La Jolla, California 92093-0411
A.H. Chokshi
Affiliation:
Department of Applied Mechanics and Engineering Sciences, University of California, San Diego, La Jolla, California 92093-0411
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Abstract

A niobium beryllide, Nb2Be17, has been prepared by powder-metallurgy techniques and the mechanical properties characterized both at room and elevated temperatures. Microhardness and fracture toughness were measured at room temperature. Hardness and hot-hardness test results indicated that, although the material was brittle at low temperatures, it became plastic at elevated temperatures (>1000 °C). Creep properties of Nb2Be17 were studied at temperatures from 1250 to 1350 °C and applied stresses from 10 to 90 MPa. The stress exponent, determined from stress-change tests, was about 3, and the activation energy, determined from temperature-change tests, was about 575 kJ/mol. The creep of Nb2Be17 at high temperature is apparently controlled by dislocation glide; this proposal was supported by transient creep experiments. Comparisons have been made between the creep properties of Nb2Be17 and other intermetallics.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 4 , April 1993 , pp. 757 - 763
Copyright
Copyright © Materials Research Society 1993

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References

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