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Rapid-Quenching Investigation of the Nb-Pd-Ge System

Published online by Cambridge University Press:  26 February 2011

C. E. Krill III  and
W. L. Johnson
C. E. Krill III
Affiliation:
California Institute of Technology, Keck Laboratory for Engineering Materials 138-78, Pasadena, CA 91125
W. L. Johnson
Affiliation:
California Institute of Technology, Keck Laboratory for Engineering Materials 138-78, Pasadena, CA 91125
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Abstract

The structure of rapidly quenched Nb100-x-yPdxGey alloys has been investigated using x-ray diffraction. Niobium concentrations were varied between 100 and 45 at.% the remainder at each Nb concentration was composed of Pd and up to y = 15 at.% Ge. Germanium was found to suppress the nucleation rate of the fcc α-NbPd phase relative to that of the bcc α-Nb phase, thereby extending the single-phase bcc solubility range by ≈ 2 at.% Nb. High Ge content (y > 6) also induced quenching of the amorphous phase. These results can be understood from the standpoint of classical nucleation theory and from a consideration of the polymorphic phase diagram of Nb-Pd. The two approaches are consistent with Ge addition depressing the To line of the fcc phase more rapidly than it depresses the To line of the bcc phase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 205: Symposium F – Kinetics of Phase Transformations , 1990 , 313
Copyright
Copyright © Materials Research Society 1992

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