Modeling the micromechanical state of γ'-precipitates in Ni-based superalloys

A simple model for describing the mechanical state associated with gamma'-particles in Ni-Al superalloys is presented. The model is based on the properties of the anisotropic elastic Green function. The strain and stress fields produced by a single cubic particle are described. The self-energy for parallelepiped gamma'-particles is calculated, finding the cubic geometry as the energetically most favorable particle shape. The anisotropy interaction between gamma'-particles is investigated. The computed results are further examined considering the interaction energy between constituting elements of the particles. The configurational force acting on a gamma'-particle during a creep test is analyzed.