Solute segregation and antiphase boundary migration in a B2-ordered single phase were studied by using computer simulations which were based upon microscopic master equations in the point approximation, with both first-nearest and second-nearest neighbour pair interactions. It was shown that the degree of segregation at antiphase boundaries was highly anisotropic. For the particular case of cylindrical antiphase boundaries along z-directions, it was found that maximum segregation occurred along the [110]-direction and was essentially zero along the [1¯10]-direction. In spite of the marked segregation anisotropy, it was demonstrated that the decrease in the square of the radius of the cylindrical antiphase domain in single-phase B2 was linearly proportional to time. It was shown that the mobility of an antiphase boundary at a given temperature was strongly composition-dependent.

Solute Segregation and Antiphase Boundary Motion in a B2 Single Phase. Q.Wang, L.Q.Chen: Acta Materialia, 1999, 47[13], 3695-703