The difference in orientation noise between regions near low angle boundaries and grain interiors has been investigated.Orientation measurements were made on samples of high purity nickel(99.999%) cold-rolled to a reduction of 98% and then annealed at 800℃ to give a strong cube texture.A pattern quality type parameter shows lower pattern qualities from volumes near the low angle boundaries.However,despite these differences the orientation noise in near-boundary regions was not found to be significantly worse than that in grain interiors.A significant variation was observed in the orientation noise for grains of different orientation.
In this paper we examine the effect on the determination of boundary length per unit area of the stepped nature of boundaries in orientation maps derived from electron back-scatter diffraction data.A correction factor is derived for isotropic microstructures.Two measures based on length per unit area for the determination of the cross-link boundary spacing in high strain deformation microstructures are then compared.A geometric method based on subtraction of the contribution to the length per area of the lamellar boundaries gives the best results,though in some cases a method based on boundary misorientation angles may be preferred.
