Identification of Dislocations in Twin Boundaries in Fe-3.25 wt%Si Alloy from Electron Microscopic Images

Image characteristics of boundary dislocations, which have been deduced from theoretical computation in a previous paper, are compared with observed micrographs of dislocations lying in twin boundaries. Especially, a strong, light or dark contrast of an edge dislocation under the condition of g·b≈0 is confirmed. The use of the new method of dislocation identification which has been developed in the previous paper is demonstrated.The dislocations which are identified in the twin boundaries are twinning partials (Remark: Graphics omitted.) and another kind of partials (Remark: Graphics omitted.). Twinning partials have been found in almost all the examined twin boundaries. It is likely that the latter dislocations have been formed by the reaction between a trapped lattice dislocation and a twinning partial. Dislocation nodes suggesting this reaction have been found.