The motion of a growth twin boundary in a bi-crystal of 4N7-purity material was investigated. The intergranular boundary of the bi-crystal coincided with the (1¯1•2) twin plane and [1¯1•1] direction. A simple shear deformation occurred along the latter direction at a rate of 0.0001/s at 300K. It was established that an applied load caused the twin-oriented intergranular growth boundary to move via a mechanical twinning mechanism. It was shown that a necessary requirement for the onset of twin-boundary motion was the presence of dislocations in the (00•1)<11•0> system. These were sources of twin dislocations which imparted motion to the twin boundary.

M.E.Bosin, F.F.Lavrentev, V.V.Nikiforenko, O.I.Salita: Fizika Tverdogo Tela, 1995, 37[10], 3130-4 (Physics of the Solid State, 1995, 37[10], 1725-7)