Abstract
Sliding behaviour of the 57° 〈101̄0〉 ∑ = 9{1 2 12} symmetric tilt boundary has been studied in zinc bicrystals. The bicrystals have been tested under creep at two different rates of intragranular slip (IS). For all the bicrystals, coupled grain boundary sliding (GBS) and migration is observed, the rates of these processes being similar along the boundary. In the vicinity at one end of the boundary, at a slower rate of IS there is no GBS or migration, and at a greater rate of IS they have negative values. Also, the increasing values of GBS and migration from one end of the boundary to the other is observed. The results obtained have been interpreted in terms of behaviour of grain boundary dislocations, produced as a result of interaction between lattice dislocations and the grain boundary.
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