Abstract
Excess vacancy concentrations are known to have a strong effect on rates of precipitation from solid solution. In quenched AI-4w/o Cu alloys, for example, precipitation rates are many orders of magnitude greater than predicted on the basis of extrapolated high temperature di f fusiv i t ies (1). Similar effects have been observed in other alloy systems (1,2,3). This enhancement is usually attributed to the increased growth rate of precipitates due to the quenched-in vacancies. Diffusion in most metals is by the vacancy mechanism, so an n-fold increase in vacancy concentration gives an n-fold increase in diffusion rate.
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