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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 for these alloys on isothermal annealing or slow cooling are reproduced satisfactorily by theoretical ratedoi:10.2320/matertrans1960.15.143 fatcat:7yqd2ufhpzdchodiw2twf35bky