Atomic ordering in alloys with the superstructures DO22 and L1o (M=1)

Abstract

In the multicluster approximation, the thermodynamic phase potentials are written, and problems of the phase equilibria of DO22-Al and L1o (M=1)-Al are solved. The correlation of atoms is taken into account at the vertices of the tetrahedron of bonds of the first coordination sphere and the isosceles triangles formed by two bonds in the first coordination sphere and one in the second. The effect of different interaction-parameter ratios on the form of the calculated phase diagrams and the temperature dependences of the long-range and short-range order parameters is discussed.