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Phase formation and stability in sputter deposited Be–Nb compounds

Published online by Cambridge University Press:  29 June 2016

J. L. Brimhall ,
L. A. Charlot  and
S. M. Bruemmer
J. L. Brimhall
Affiliation:
Pacific Northwest Laboratory, Battelle Memorial Institute, Richland, Washington 99352
L. A. Charlot
Affiliation:
Pacific Northwest Laboratory, Battelle Memorial Institute, Richland, Washington 99352
S. M. Bruemmer
Affiliation:
Pacific Northwest Laboratory, Battelle Memorial Institute, Richland, Washington 99352
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Abstract

The phase relations and thermal stabilities of phases in sputter deposited Be–Nb alloys (3–14% Nb) have been studied. An amorphous phase forms during deposition at ambient temperatures (30 °C) for compositions >5% Nb. Metastable crystalline phases form during deposition at 350–450 °C as well as during annealing of the amorphous phase. One metastable bcc phase designated as Be12Nb′ can be explained by an extremely high fault density in the Be12Nb structure and is a precursor phase to the formation of both Be12Nb and Be17Nb2. Another metastable bcc phase also forms during high temperature deposition. Transformation to the equilibrium phases occurs at temperatures >800 °C. A stoichiometric range of about 5.5–7.8% is indicated for the Be12Nb phase and is probably due to vacancies on the Nb sublattice. No evidence of a Be5Nb phase was found and the Be17Nb2 phase is stable to room temperature.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 1 , January 1992 , pp. 89 - 99
Copyright
Copyright © Materials Research Society 1992

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