M.E.Bosin, F.F.Lavrent'ev*, V.N.Nikiforenko*
Received February 5, 1998; in final form October 10, 1998
Dislocation reactions in bismuth single crystals were considered
using the crystal geometry method in an effort to reveal the causes
of the twin width stabilization in the course of twinning and untwinning
as well as of the increase in the twin boundary motion rate at the
untwinning under the alternating cyclic loading. The consideration
has shown that there are four physically inequivalent reactions that
are of a particular interest. The increase of the twin boundary motion
rate is associated with the pair dislocation interaction where the
resulting dislocation is a source of the twinning ones.