Abstract
SUMMARYThe cellular precipitation occurring in an Al–28at%Zn alloy has been followed in situ using a hot stage in the high voltage electron microscope. The cellular reaction starts at grain boundaries and after a period of accelerated growth, a linear growth rate is established. The interlamellar spacing and the rate of growth vary as a function of temperature and the results have been analysed on the basis of the Turnbull theory of cellular precipitation which suggests that the cell boundary diffusion is the rate controlling factor in this system.
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