The energies of strain-induced elastic interactions of interstitial-substitutional pairs were calculated while taking account of the discrete atomic structure of the host lattice. The elastic constants, lattice spacings, Born-von Karman constants of the host lattice, and the coefficients of the concentration expansion of the solid-solution lattice due to solute atoms, were used as inputs. When a substitutional atom expanded the crystal lattice, there was an attraction in the first 2 coordination shells. When a substitutional atom contracted the crystal lattice, the first 2 coordinate shells exhibited repulsion while the third exhibited a weak attraction. In general, the interstitial-substitutional interaction in face-centered cubic metals was weaker than in body-centered cubic metals. In some solid solutions, it was very strong and had to be taken into account when analyzing the structure and properties of solid solutions.

Strain-Induced Interaction of Dissolved Interstitial and Substitutional Atoms in FCC Metals. M.S.Blanter: Journal of Alloys and Compounds, 1999, 282[1-2], 137-41