Differences in microstructures such as foliation intensity, orientation and subgrain boundary density can be seen along the direction of strain rate gradient. This movies shows how the rates of grain growth - strain energy driven or surface energy driven, are different for the strain rate domains of Movie 06. At the beginning, the process of grain growth in the high strain rate domain seems to be faster than that of low strain rate domain. However, with time, the rate of grain growth seems to be faster in the low strain rate domain, resulting in coarser grained texture in this domain in the end. Observed at the same temperature as the preceding deformation.
Shearing is localized in the two zones near the top and bottom of the field.
In these zones, subvertical alignment of subgrain boundaries can be seen. At the end, nearly single grain, at least in c-axis orientations, forms, which resembles ribbons. Subgrain boundary migration and grain size increase Subgrain boundaries, oriented subvertically, migrate during deformation. Subhorizontal relative motions of markers within some grains can be seen, and this suggests that the slip planes of these grains are also subhorizontal or perpendicular to the subgrain boundaries. Since the traces of subgrain boundaries are subparallel to the c-axes, the observed motion of markers suggests slip on the basal planes.