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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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References

1. Klement, W., R H. Willens and Duwez, P., Nature 187, 869–870 (1960); M. H. Cohen and D. Turnbull, Nature 189, 131-132 (1961).CrossRefGoogle Scholar
2. Cahn, R. W., in Physical Metallurgy, 3rd ed., edited by Cahn, R. W. and Haasen, P. (Elsevier, Amsterdam, 1983) Part 2, Chap. 28, pp. 1779–1852.Google Scholar
3. Jones, H., Rapid Solidification of Metals and Alloys (The Institution of Metallurgists, London, 1982).Google Scholar
4. Jorda, J. L., Flükiger, R. and Müller, J., J. Less-Common Met. 62, 25–37 (1978).CrossRefGoogle Scholar
5. Binary Alloy Phase Diagrams, edited by Massalski, Thaddeus B., Murray, Joanne L., Bennett, Lawrence H., and Baker, Hugh (American Society for Metals, Metals Park, Ohio, 1986), Vol. 2, p. 1237.Google Scholar
6. Khalaff, K. and Schubert, K., Z. Metallkd. 65, 379–382 (1974).Google Scholar
7. Taylor, A., X-ray Metallography (Wiley, New York, 1961), pp. 332–336.Google Scholar
8. Klug, Harold P. and Alexander, Leroy E., X-ray Diffraction Procedures for Polycrystalline and Amorphous Materials, 2nd ed. (Wiley, New York, 1974), chapter 8, 9.Google Scholar
9. Giessen, B. C., Grant, N. J., Parker, D. P., Manuszewski, R. C. and Waterstrat, R. M., Metall. Trans. A 11A, 709–715 (1980).CrossRefGoogle Scholar
10. Chandrasekharaiah, M. S., Bull. Alloy Phase Diagrams 9, 449–452 (1988).CrossRefGoogle Scholar
11. Turnbull, D., J. Chem. Phys. 20, 411 (1952).CrossRefGoogle Scholar
12. Turnbull, D., J. Appl. Phys. 21, 1022–1028 (1950).CrossRefGoogle Scholar