Abstract
To give information on the dynamical property of reversion phenomena in Al-Zn alloy, time-resolved small-angle X-ray scatterings have been measured using synchroton radiation. The time-dependent dissolution rate of G.P. zones is well described by the Johnson-Mehl-Avrami equation. The experimental time-exponent and temperature-dependent relaxation time deviate largely from expectations, suggesting that the reversion process is not controlled by the diffusion of solute atoms in the matrix. It has been found that Guinier radius increases slightly during reversion.
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