Self-diffusion in substitutional solid solutions with Fcc lattice

Abstract

With the use of the results from the previous paper1 and from the papers of the other authors it has been ascertained that in some solid solutions with fcc lattice the self-diffusion frequency factorD oAB A and activation enthalpy ΔH AB A of the element A in the alloy A-B are given by the equations , whereK 0,K 1 are constants,T m andT m A are melting points of the alloy or of element A respectively,X B is the atomic percent of element B,D o A A and ΔH A A are diffusion characteristics of the pure element A. For the frequency factor of regular or nearly regular solid solutions with fcc lattice that present a mutual solubility and for which the diffusion data for the whole concentration interval are available, the following relation has been found For the activation enthalpy of these solutions the equation $$\Delta H_{AB}^A = {{T_m } \over {100}}\left[ {{{\Delta H_A^A } \over {T_{mA} }}X_A + {{\Delta H_B^A } \over {T_{mB} }}X_B } \right]$$ is satisfied, whereD oB A and ΔH B A are the characteristics of heterodiffusion of element A in element B andT m B is the melting point of element B.