Grain boundary migration in Fe-3mass%Si alloy bicrystals with twist boundary

Abstract

The characteristics of grain boundary migration in Fe-3mass%Si alloy bicrystals with S 3͗011͘, S5͗001͘ and S9͗011͘ coincidence twist boundaries and random twist boundaries were examined to obtain an information on the development of {110}͗001͘ (Goss) texture. The bicrystals were annealed at 1223 K for an appropriate time and the grain boundary migration speed was evaluated.The S 5͗001͘ and S9͗011͘ twist boundaries showed higher migration speed than S3͗011͘ twist boundaries, and the random twist boundaries migrated faster than other boundaries. The migration speed decreased with increasing annealing time due to an increase in the edge components of the lattice misfits in the migrated boundaries. The grain boundary migration was also sensitive to the deviation angle (Du ) from the ideal orientation relationship for a coincidence boundary. The increase of Du accelerated the boundary migration. The motion of the grain boundary was influenced by plastic strain. Migration of the S9 twist boundary was more suppressed by plastic strain than that of the random boundary. On the basis of characteristics of the grain boundary migration, the effect of inhibitor on the Goss texture was discussed. ᭧