Slip planes determination Sample Clauses

Slip planes determination. An analysis of the slip planes at different temperatures has been carried out on the 14Cr-ODS steels. From the acquisition of the diffraction pictures of a grain at different tilts, it is possible to reconstruct the stereographic projection of the grain (shown in figure 13b). This projection allows more or less determining the slip planes of dislocations from the knowledge of the tilt of the images and the orientation of the slip traces on the surface as illustrated in figure 13. The figure 13a corresponds to an image taken at -23° of tilt. On this image, slip traces are observed at an angle of 80° to the perpendicular to the image. This angle is reported on the stereographic projection of the grain, giving the red point on the blue curve that represents the surface thin foil. Three {112} planes could correspond as three red curves of the {112} planes, i.e. (12-1), (21-1) and (2-1-1), and the blue curve of the surface intercept close to the red point. Taking into account the uncertainty, it is not possible to clearly discriminate between the three planes. Nevertheless, the (21-1) plane is the only one exhibiting a Burgers vector of <111> type in agreement with the suspected screw character of the dislocation. The corresponding Burgers vector would thus be [1-11]. Tilt of -23° 80° a)