Dislocation Dissociation Strongly Influences on Frank–Read Source Nucleation and Microplasticy of Materials with Low Stacking Fault Energy

The influence of dislocation dissociation on the evolution of Frank–Read (F-R) sources is studied using a three-dimensional discrete dislocation dynamics simulation (3D-DDD). The classical Orowan nucleation stress and recently proposed Benzerga nucleation time models for F-R sources are improved. This work shows that it is necessary to introduce the dislocation dissociation scheme into 3D-DDD simulation, especially for simulations on micro-plasticity of small sized materials with low stacking fault energy.