Abstract
Abstract The diffusion coefficients of 65Zn have been measured in dilute AlCu, AlCuZn, AlSi and AlSiZn alloys as a function of the concentration and temperature in the range of solid solutions. The 65Zn diffusion coefficients depend linearly on the Cu and Si concentration and the enhancement effects of the different solutes investigated are additive. The experimental values–together with previous results for 65Zn diffusion in dilute AlZn, AlMg and AlZnMg alloys (Beke et al. 1977)–are interpreted on the generalization of the model given by Le Claire (1978) and it is found that the tracer jump frequencies in the vicinity of the solutes change only by a factor less than 2. Furthermore, supposing that the jump frequencies are unaltered and the solute-solute binding are also negligible, an approximate expression can be obtained for the enhancement factor which contains only the solute-vacancy binding energy B t,v. From this relation the following approximative values were obtained B zn,v = 0.03 ± 0.01 eV, B Mg...
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