In order to examine twin growth mechanisms, a high-resolution electron microscopic study was made of the tip morphology of the (10▪2) twin. By using a new model, the twin tip was described as being a series of (¯10▪2)||(¯10▪¯2) step faces which contained one or more interfacial dislocations. They were separated by incoherent (00▪1)||(10▪0) interfaces which resulted from a pile-up of twinning dislocations. Stresses around the twin tip were accommodated by the emission of (c + a) 1/3<11▪3> lattice dislocations and by the formation of residual dislocations, with a Burgers vector of 0.47[¯10▪1], which had the opposite sign to that of the twinning dislocation. This relaxation process was associated with a blunting mechanism which finally stopped twin growth along the [10▪¯1] direction.

T.Braisaz, P.Ruterana, G.Nouet: Philosophical Magazine A, 1997, 76[1], 63-84