Diffusion in Ternary Silver-Zinc-Cadmium Solid Solutions

Diffusion in the silver-zinc-cadmilth system was investigated at 6000C with semi-infinite, vapor-solid couples in order to evaluate intrinsic
diffusion coefficients and interdiffusion coefficients in the alpha and beta phases. Intrinsic diffusion coefficients were determined at several composition
points.in the alpha phase region along concentration lines of 11 at. pct＂ Zng 18 at. pet. Zns 5 at. pct. Cd and 9 at. pct. Cd. Interdiffusion coefficients in the a phase were determined at several points of intersection of various composition paths; these composition points of intersection were along lines of constant zinc-to-cadmium concentration ratios of 3.8, 1.8 and
1.2. All two-phase diffusion couples developed planar B/a interfaces. Intrinsic coefficients were computed at three composition points in the beta
reg a corresponding to a silver concentration of approximately 55 at. pct. Intrinsic coefficients for B alloys are two to three orders of magnitude larger than those for alpha alloys.

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