The relation of x-ray small angle scattering parameters to transmission electron microscopy results for spherical GP zones is investigated. The Guinier radius is found experimentally to equal (R 7/R 5)½ and the Porod radius to equal R 3/R 2. This result had been theoretically predicted by Baur and Gerold (1964). It was further found that a log normal distribution closely fits the experimental data. The use of this distribution allowed the size distribution curve of spherical GP zones to be constructed from the x-ray parameters and a knowledge of the metastable miscibility gap. This result is used to follow the evolution of size distribution in both Al-Ag and Al-Zn alloys. The application of this approach to nucleation and growth as well as redistribution processes is discussed.
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Harkness et al. (1969) studied this question.