Abstract
Abstract In-situ heating experiments have been performed on thin foils of a single crystal with composition Fe-25·6 at .% Al. The isothermal evolution of antiphase boundaries (APBs) has been investigated by means of transmission electron microscopy. APBs play an important role in phase changes of long-range ordered alloys. The grown-in domains were found to have the DO3 long-range order structure with randomly shaped APBs (swirl-shaped domains). Up to 400[ddot]C, no significant change in the domain and APB structure was observed. At 500[ddot]C, which is below the transition temperature (Tc ≍ 550[ddot]C) from DO3 to B2 coarsening of the domains has been analysed and dislocation motion was detected. The dislocations were analysed to have a Burgers vector of (a'0/4) (111) (a'0 is the lattice parameter of the DO3 lattice). The dislocations drag behind them APBs of B2 type. Reactions of the B2-type APBs with the DO3-type grown-in boundaries have been analysed. With increasing annealing time the density of the ...
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