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An energy-analysing electron microscope has been used to measure directly the magnesium solute concentration profiles within the precipitate-free zones formed in aged Al-6% Zn-3% Mg alloys. The results are consistent with the proposals of Pashley, Jacobs and Vietz (1967), and Unwin, Lorimer and Nicholson (1969). Analysis of the resulting magnesium solute profiles has yielded low-temperature diffusion data for magnesium in the presence of zinc.
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Doig et al. (1973) studied this question.
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