Phase decomposition and reversion processes in A1-Li binary alloys have been studied by synchrotron-radiation small-angle/100 scattering experiments. The microstructure and its evolution obtained from small-angle scattering (SAS) and 100 profiles during phase decomposition and reversion are discussed. For the coarsening and reversion processes where a well defined interface between the 6' precipitates and the matrix can be expected, the information obtained from the SAS and 100 profiles was essentially the same. On the other hand, the structural information they convey can be different in the early stage of phase decomposition. The interpretation of the SAS and 100 intensities by means of an extension of the two-phase model has been examined.
The reversion process of very small Guinier-Preston (GP) zones in A1-Zn binary alloys has been studied by time-resolved synchrotron-radiation small-angle X-ray scattering (SR-SAXS) measurements. Al-15at.% Zn alloys with GP zones of 1.0 to 1.3 nm in radius formed by aging at 274K were up-quenched up to 463K. During reversion, the Guinier radius increased rapidly while the integrated intensity decreased. This rapid increase of the radius was completely different from what was found during the reversion of larger GP zones above the miscibility gap. It is concluded that a process of simultaneous dissolution and coarsening has been observed.
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