Abstract
AbstractObservations of grain‐boundary migration in both creep and fatigue are reviewed and grouped into thirteen classifications, particularly noting the relationship between migration and grain‐boundary sliding. It is concluded that all experimental observations so far have been of more than one of these classifications and none give unambiguous support to the hypothesis that sliding and migration are coupled through the motion of grain boundary dislocations. Several sets of results using bicrystals are particularly difficult to reconcile with this hypothesis.
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