Abstract
The kinetics of the precipitation and coarsening of secondary-phase particles from a gamma quenched, dilute uranium alloy have been studied. The method of thin-foil electron microscopy was used. The precipitation from supersaturated solid solution at the onset of ageing was clearly distinguished from the subsequent process of coarsening. The values of the exponent, n, in the Avrami equation, together with metallographic evidence, indicate that precipitation on subgrain boundaries and on dislocations within subgrains occurred. Coarsening of particles can be best approximated by the equation r 3 − r 0 3 = kt.
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