The stability of short-range reactions between two dislocations of parallel
line vectors which glide on two parallel slip planes in BCC crystals is de
termined. The two dislocations are assumed to be infinitely long, and their
interaction is treated as elastic. The interaction and self-energies are b
oth computed for dynamically moving dislocations, where the dependence on d
islocation velocity is taken into account. The stability of the reaction is
determined as a function of the following phase space variables: relative
angle, relative speed, dislocation mobility, Burgers vector, separation of
slip planes, and external force. Our results indicate that the dynamic form
ation of dislocation dipoles or tilt wall embryos occurs only over a small
range of the investigated phase space. Inertial effects are shown to be imp
ortant at close separation, because of the large force between the two disl
ocations comprising the dipole or tilt wall embryo. We find that destabiliz
ation of the dislocation dipoles or tilt wall embryos is enhanced by extern
ally applied stresses or by stress fields of neighboring dislocations.