Orientation dependence of the deformation kink band formation behavior in Zn single crystal

Electron backscatter diffraction pattern analysis of the deformation band formed in the Mg-based long-period stacking ordered phase

“…1(b). In this regard, it was recently reported that the waviness of the bands in a Zn single crystal can be explained by assuming that the deformation band is not a deformation twin but a deformation kink band [28]. To validate this assumption, the use of the analysis protocol using EBSD on (0001) was proposed.…”

“…To validate this assumption, the use of the analysis protocol using EBSD on (0001) was proposed. The details of this method have been reported in a previous paper [28], but the essence of the analysis is briefly described. Consider the deformation of a crystal whose loading axis is parallel to [11 20].…”

“…Consider the deformation of a crystal whose loading axis is parallel to [11 20]. Assuming that the deformation kink band boundary is constructed by a basal dislocation array comprising only one kind of dislocation with a Burgers vector parallel to [11 20], the boundary plane of the deformation kink band must lie on (11 2X) [28]. The value of X varies depending on the density of the dislocations that form the deformation kink band boundary.…”

“…Therefore, the trace must lie perpendicular to the loading axis on the (0001) specimen side surface independent of the value of X, i.e., independent of the density of the dislocations that form the deformation kink band boundary. On the other hand, if the deformation kink band boundary is constructed by two kinds of basal dislocations, e.g., by equivalent numbers of [11 20] and [2 1 10] dislocations, the kink band boundary must lie on the (101X) plane [28]. In this case, the trace of the deformation band boundary on the (0001) side surface is inclined by 30°with respect to the direction normal to the loading axis independent of the value of X.…”

“…To clarify the origin of the deformation band in the LPSO phase, elucidation of its crystallographic features must be useful. In this regard, we recently proposed a protocol to distinguish deformation kink bands and deformation twins in hexagonally structured materials via electron backscatter diffraction pattern analysis in scanning electron microscopy (SEM-EBSD) on the (0001) specimen surface, by using a Zn single crystal as a model material [28]. In this study, the proposed observation protocol was applied to the LPSO phase, and the nature of the deformation band in the LPSO phase was discussed.…”