A generalized Peierls-Nabarro model for curved dislocations

Yang Xiang

Hong Kong University of Science and Technology

The Peierls-Nabarro model is a continuum framework incorporating atomic
features for dislocations (line defects) in crystals. We present a 
generalized Peierls-Nabarro model for the core structure and dynamics 
of curved dislocations, in which the anisotropic elastic energy is 
obtained efficiently using the Fast Fourier Transform method, and the 
generalized stacking fault energy is used for the interplanar potential 
across the slip plane. Simulation results are reported on core 
structures and activation energies of dislocation loops in Al and Cu.