  During plastic deformation of crystalline materials, point defects such as
vacancies and interstitials are generated by jogs on moving dislocations. A
detailed model for jog formation and transport during plastic deformation was
developed within the vector density-based continuum dislocation dynamics
framework (Lin and El-Azab, 2020; Xia and El-Azab, 2015). As a part of this
model, point defect generation associated with jog transport was formulated in
terms of the volume change due to the non-conservative motion of jogs. Balance
equations for the vacancies and interstitials including their rate of
generation due to jog transport were also formulated. A two-way coupling
between point defects and dislocation dynamics was then completed by including
the stress contributed by the eigen-strain of point defects. A jog drag stress
was further introduced into the mobility law of dislocations to account for the
energy dissipation during point defects generation. A number of test problems
and a fully coupled simulation of dislocation dynamics and point defect
generation and diffusion were performed. The results show that there is an
asymmetry of vacancy and interstitial generation due to the different formation
energies of the two types of defects. The results also show that a higher
hardening rate and a higher dislocation density are obtained when the point
defect generation mechanism is coupled to dislocation dynamics.
