Synchrotron Radiation Small-Angle Scattering Study on the Reversion Process of G.P. Zones below Miscibility Gap in Al–Zn Binary Alloys

Abstract

Structure change during reversion below the G.P. zone solvus has been investigated by means of synchrotron radiation small-angle X-ray scattering (SR-SAXS). The whole process was found to be divided into two periods., i.e., the reversion and the subsequent coarsening period. From the two-phase analysis, it was suggested that the solute concentration of G.P. zone decreases, but the zone size does not change in the first stage, and then the zone shrinks without composition change at the later stage of reversion. The present experimental results agreed well with those obtained by computer simulations.