1980 年 21 巻 10 号 p. 660-666
The ordering and phase separation in the Fe–Al alloy have been investigated on the basis of the pairwise interaction model. The tendencies toward the ordering and phase separation are proved to be caused by the effect of interactions between the 3rd neighboring or farther atoms in addition to the 1st and 2nd neighboring ones. In the Fe–Al alloy on the iron-rich side, the three kinds of phase separation into α and B2, α and DO3, and B2 and DO3 are demonstrated to occur besides the ordering of the B2 and DO3 types. The equilibrium phase diagram of the Fe–Al system proposed by the present calculation agrees well with previous experimental results.