The δ' coherent phase solvus is determined in the range 20° to 200°C by X-ray small-angle scattering. The data represent an upper limit to the coherent boundary and agree well with the higher temperature data on δ' and δ solvus previously reported in the literature. The radius of G.P. zones, calculated at several aging temperatures by SAXS, is in reasonable agreement with the values observed by other authors using transmission electron microscopy.
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Ceeesara et al. (1977) studied this question.
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