Abstract
Multiphase diffusion was investigated in the Cu−Ni−Zn system at 775°C for the development of diffusion structures involving two interfaces. Selected series of diffusion couples characterized by a common γ (cubic) terminal alloy joined to a set of α (fcc) alloys developed an intermediate β (bcc) phase with two interfaces, α/β and β/γ. The α/β interface showed transitions from planar to nonplanar and back to planar morphology, as the copper concentration of the α terminal alloy was decreased from 100 to about 30 at. pct. Planar β/γ interfaces were observed for all but two of the couples. The compositions on either side of planar α/β interfaces were consistent with those based on equilibrium tielines, while the compositions at nonplanar α/β interfaces differed from those of equilibrium. Selected series of couples assembled with γ and β alloys were also investigated for the development of interface instability at the β/γ interface. The diffusion paths of γ/β couples were consistent with those of γ/α couples.
Similar content being viewed by others
References
C. W. Taylor, Jr. M. A. Dayananda, and R. E. Grace:Met. Trans., 1970, vol. 1, pp. 127–31.
D. E. Coates and J. S. Kirkaldy:Met. Trans., 1971, vol. 2, pp. 3467–77.
R. D. Sisson, Jr. and M. A. Dayananda:Met. Trans., 1972, vol. 3, pp. 647–52.
R. D. Sisson, Jr.: Ph.D. Thesis, Purdue University, 1975.
G. L. Kehl,The Principles of Metallographic Laboratory Practice, p. 420 McGraw-Hill, New York, N.Y., 1949.
T. O. Ziebold and R. E. Ogilvie:Anal. Chem., 1964, vol. 36, pp. 322–27.
K. J. Anusavice and R. T. DeHoff:Met. Trans., 1972, vol. 3, pp. 1279–98.
L. E. Wirtz: M.S. Dissertation, Purdue University, 1975.
J. S. Kirkaldy:Can. J. Phys., 1958, vol. 36, pp. 907–16.
D. E. Coates:Met. Trans., 1972, vol. 3, pp. 1203–12.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Wirtz, L.E., Dayananda, M.A. Diffusion paths and structures in multiphase Cu−Ni−Zn couples at 775°C. Metall Trans A 8, 567–575 (1977). https://doi.org/10.1007/BF02676977
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02676977