Diffusion of Gold and Copper in Aluminum

Al have shown that in the case of a low solid solubility in Al the diffusion coefficient is unusually low relative to the self-diffusion coefficient of Al. Impurities which fall under this category are V(3), Cr(4), Fe(1), Ni(1), CO(1), Pd(6), Nb(2), Mo(5), Cd(6), In (6) and Sn(6). However, recently, Agarwala(7) has reexamined the results on the diffusion of In and Sn in Al using the vacuum evaporation method in which irradiated In or Sn metal was evaporated on the electrolytically polished Al samples in a standard vacuum evaporating unit (vacuum 10-6 Torr.). The results show that the impurity diffusion coefficients of 14In and 113Sn in Al are approximate to the self-diffusion of Al and are very different from his earlier results(6) on a very dilute solution of nitrates containing 114In or 113Sn which was spread on the surface of the samples and dried. Therefore, we cannot conclude that In and Sn belong to the above-mentioned group of impurity diffusion in Al. Few and less reliable datat on the diffusion of Au in Al had been available when the present investigation was started. Solid solubility of Au in Al is very low

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