Continuum models for dislocation structure, energy and dynamics of dislocation arrays and low angle grain boundaries
Yang Xiang (Hong Kong Univ of Sci and Tech)
Joint Session: Discrete Dislocation Plasticity and From Atomistics to Reality: Spanning Scales in Simulations and Experiments
Mon 2:40 - 4:00
CIT 227
We present continuum models for dislocation structure, energy and dynamics of dislocation arrays and low angle grain boundaries which may be nonplanar and nonequilibrium. In our continuum model, we define a dislocation potential function on the dislocation array surface or grain boundary to describe the orientation dependent continuous distribution of dislocation in a very simple and accurate way. The continuum formulations of energy and dynamics are derived from the discrete dislocation model, and include the long-range interaction of constituent dislocations, local line tension effect of dislocations, and the cooperative motion of dislocations. Applications to low angle grain boundaries are presented.