Published: 1980
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This report outlines some preliminary experiments on grain boundaries, grain boundary ledges, and the apparent emission of dislocations from grain boundary ledges, as part of an attempt to directly observe the emission of dislocations from grain boundary ledge sources in-situ by high-voltage transmission electron microscopy. Observations of grain boundary ledges and dislocation emission profiles in strained sheets of 304 stainless steel are described. Preliminary results indicate that the number of dislocation profiles per unit length of grain boundary are related to the engineering strain, as are the mean profile lengths. In addition, ledge density increases with increasing strain, and grain boundary structure changes with increasing strain.