Abstract
The change in the micro-domain structure of Fe-Al alloys during the isothermal annealing has been investigated by means of transmission electron microscopy. The domain structure shows very complicated features in each transition, but the results of the observation are consistent with those of our previous work using X-ray diffraction. In the transitions B2→α+B2 and α+B2→α+DO3 the decomposition of the ordered phase into a mixture of the ordered and disordered phases takes place. The transition α+DO3→DO3 is dominated by the nucleation of DO3 domains in the disordered phase. In the reverse process, from DO3 to α+DO3, the disordered phase precipitates in two steps from the DO3 phase.
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