The immobilization rate of dislocations
U and re-mobilization probability of immobile
dislocations V decrease with increasing strain while the
ratio U:V increases. The immobile dislocation density
rim increases but the mobile density rm and its ratio to
the immobile density rm:rim decrease. Further, the
thermal component of flow stress s* decreases through
the changes in mobile dislocation density and its velocity.
These parameter changes stem partly from the
changing strain hardening rate and partly from a decrease
in the true strain rate.