Abstract
High resolution electron microscopy (HREM) was performed on 〈 c〉-type dislocations in annealed Zircaloy-4 which had been neutron irradiated to 20 dpa at 690 K. Lattice images of the 〈 c〉-type dislocations, which lie on the basal plane, reveal unfaulted dislocation structure. Conventional TEM analysis of these dislocations in postirradiation annealed Zircaloy-2 shows that the 〈 c〉-component dislocations have Burgers vectors of 1 3 〈11 2 ̄ 3〉 and [0001]. Large bends in the 〈 c〉-component dislocation network are associated with multiple 〈 a〉-type dislocations. Initial results by electron holography of the 〈 c〉-type dislocation core region produces phase shifts having a length of ~ 3 basal planes in isolated regions along the length of the dislocations. The shift may occur due to large solute concentrations.
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