Thermodynamics of Deformation under Irradiation

Abstract

An irreversible thermodynamic model is proposed for describing the deformation of a crystal under stress and irradiation. A thermodynamic inequality is found to relate the lattice straining and stress with the irreversible part of the free energy density. As an application of the model the case of straight dislocation climbing under irradiation is studied.Un modhle thermodynamique irreversible est propose pour dbcrire la deformation d'un cristal sous contrainte et irradiation. Une idgalit6 thermodynamique est trouv6e qui rattache la &for-mation e t les contraintes du reseau avec la partie irreversible de la densite d'energie libre. Comme application du modhle on 6tudie le cas de la montee d'une dislocation coin sous irradiation.

Grain Boundary Sink Strength in Anisotropic Materials

“…The internal sinks will be considered to be smeared out at an effective medium within the grain and their strength for point defects will be taken as a known parameter ksc. This is related to their rate of absorption of point defects I,, at a point r by the definition where (D) is the volume averaged diffusivity and c(r) the point defect concentration averaged in a representative volume element (RVE) at the point r within the grain (for a definition of RVE see [29]).…”