Theory of order-disorder and order-order transformation in binary alloys with B.C.C. lattice—III.: Atomic ordering in Fe-Al system

Abstract

On the basis of the general theory developed with the account of a four-particle correlation of atoms in the tetrahedron cluster sites the atomic ordering is considered in the Fe-Al system with 0–50 at % Al. The calculated equilibrium diagram of the phases Fe 3Al(DO 3), FeAl(B2) and short-range order phases α(A2) are in agreement with the diagram proposed by Rudman. The temperature dependences of short- and long-range order parameters in the case of Fe 3Al and Fe 13Al 3 compositions are discussed.