Formation Mechanism of Dislocation Structures during Cyclic Deformation in an Fe-Si Alloy

Abstract

The dislocation structures in polycrystalline Fe-1 mass% Si after cyclic deformation were observed using high voltage electron microscopy in order to investigate the formation mechanism of the dislocation structures. Vein, wall, and cell structures were found in a deformed specimen. Detailed orientation and structure of the walls were analyzed. Burgers vectors of dislocations in the walls were a/2[111] and a/2[1  11]. A set of walls was arranged parallel to the (110) plane and it was found to be a part of labyrinth structure consisting of the (110) and (001) walls. It is suggested that the formation mechanism of the labyrinth structure in bcc metal is reasonably understood by extending the mechanisms in fcc metals.