Abstract
The kinetics of ordering in Fe-Al alloys with about 25 at%Al is investigated both theoretically and experimentally. The kinetic equations which express the time variation of the degrees of order in B2 and DO3 structures are obtained by taking into account the direct interchange of atoms between the first and the second nearest neighbors. The experimental results of X-ray diffraction on isothermal annealing or slow cooling of these alloys are reproduced satisfactorily by the theoretical rate equations.The ordering in DO3 type is influenced substantially by the atomic interchange between the second nearest neighbors. The B2 type ordering takes place so rapidly that the quenching from a disordered phase can not prevent the ordering. An oscillatory change of the degree of order in the B2 structure is expected from the calculation in the isothermal annealing.
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