Atomistic and Continuum Models for Deformation of Irradiated Metals

The fundamental characteristics of defect structures and the effect of radiation defects on plastic deformation were investigated by atomistic and continuum models. Self-interstitial atom (SIA) loops, vacancy loops, and the effect of stacking fault tetrahedra were studied as typical irradiation defects. The fault energies of these defects were evaluated by atomistic models and dislocation theory with non-empirical measurement. The effects of size and densities of SIA and vacancy loop on the critical shear stresses were systematically estimated. A mesoscopic framework based on the crystal plasticity model was proposed, in which fundamental properties are applied to a database for mesoscopic computational models.