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Intrinsic diffusion and vacancy wind effects in Ag-Cd alloys

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Abstract

Diffusion in the Ag-Cd system was investigated at 600°C with vapor-solid and solid-solid diffusion couples in the α-phase for the determination of intrinsic diffusion coefficients, atomic mobilities and interdiffus ion coefficients. Intrinsic diffusion coefficients, DCd and DAg, determined experimentally, were compared with those predicted from the models of Darken, Manning, and Dayananda with the aid of tracer diffusion and thermodynamic data. The experimental coefficients for various alpha alloys were found to be higher than those evaluated from each of the three models. On the other hand, the experimental values of the ratio, DCd/DAg were found to be in good agreement with the models of Manning and Dayananda where the vacancy wind effects on intrinsic diffusion are taken into account. Darken’s relations are considered inadequate to interrelate tracer and intrinsic diffusion coefficients in the Ag-Cd system, since vacancy wind effects are found to be appreciable in this system.

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Authors and Affiliations

  1. Westinghouse Electric Corp., Tampa, Fla.

    N. R. Iorio

  2. School of Materials Science and Metallurgical Engineering, Purdue University, 47907, West Lafayette, Ind.

    M. A. Dayananda (Associate Professor) & R. E. Grace (Professor)

Authors
  1. N. R. Iorio
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  2. M. A. Dayananda
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  3. R. E. Grace
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Iorio, N.R., Dayananda, M.A. & Grace, R.E. Intrinsic diffusion and vacancy wind effects in Ag-Cd alloys. Metall Trans 4, 1339–1346 (1973). https://doi.org/10.1007/BF02644530

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  • DOI: https://doi.org/10.1007/BF02644530

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