Abstract
After overview on the behaviour of first order order/disorder phase transformation based on the instability diagrams, the results of in-situ SR-SAS measurements have been reported in order to clarify the process of transformation, the growth mechanism of metastable L1 2 phase and its coarsening as well as the reversion process in Al-Li alloys. The results were compared with computer simulation by using kinetic Ising model with interaction up to the second nearest neighbour. The relationship between local ordering and clustering and the scaling behaviour of structure factor have been discussed in detail, especially at very early stage of phase decomposition and during rapid reversion at high temperatures
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