| Abstract Scope |
A thermodynamically rigorous model to simulate the dynamics of dislocations due to rapid/gradual solid-state heating-cooling or solid-state thermal cycling (SSTC), is proposed. The proposed model, called the Thermal Field Dislocation Mechanics (T-FDM) model, is an extended coupling of the FDM approach with the heat transfer problem. Its novelty lies in its unique ability to simulate: (i) dislocation generation/annihilation/motion under the action of mechanical and thermal (heat-flux/temperature) boundary conditions, and (ii) local temperature changes induced by moving dislocations with evolving densities. The model can be applied to study dislocation motion under the action of rapidly evolving boundary conditions such as those occurring during AM, quenching, etc. The range of applicability of the model, including dislocation interactions with evolving chemical species (precipitates, microsegregations, etc.) and up-scaling to the crystal plasticity level, will be discussed. Validity of model assumptions, e.g. local thermodynamic equilibrium, are discussed in the context of SSTC during AM. |