Abstract
Tracer diffusion coefficients were determined for the three isotopes, Zn65, Cu67, and Ni66, in homogeneous Cu-Ni-Zn binary and ternary alloys, to 30 pct Ni and Zn, and pure copper as a function of composition and as a function of temperature, within about 250°C of the solidus surface. Activation energies andD 0 factors were determined as functions of composition from these measurements. It is found that as the composition plane is traversed in the general direction from high nickel compositions on the copper-nickel binary to high zinc concentrations on the copper-zinc binary,i.e., as nickel is replaced by zinc, the diffusivity of all three tracers increases, and the activation energy for diffusion decreases. The total change in diffusivity across the composition plane is about two orders of magnitude. The three diffusivities are always in the order:D*Zn >D*Cu >D*Ni, with the ratio being 9∶3∶1 at 900°C for all compositions. The three activation energies are usually in the orderQ*Ni >Q*Cu >Q*Zn. These results are shown to be consistent with atom size and electron-to-atom concentrations of the three species in this alloy system.
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K. J. ANUSAVICE, formerly Graduate Student, Department of Materials Engineering, University of Florida, Gainesville, Fla.
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Anusavice, K.J., DeHoff, R.T. Diffusion of the tracers Cu67, Ni66, and Zn65 in copper-rich solid solutions in the system Cu-Ni-Zn. Metall Trans 3, 1279–1298 (1972). https://doi.org/10.1007/BF02642463
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DOI: https://doi.org/10.1007/BF02642463