By Ulrich Messerschmidt
The publication supplies an outline of the dynamic habit of dislocations and its relation to plastic deformation. It introduces the overall houses of dislocations and treats the dislocation dynamics in a few aspect. ultimately, examples are defined of the strategies in numerous sessions of fabrics, i.e. semiconductors, ceramics, metals, intermetallic fabrics, and quasicrystals. The tactics are illustrated via many electron micrographs of dislocations below rigidity and via videos taken in the course of in situ straining experiments in a high-voltage electron microscope displaying relocating dislocations. therefore, the clients of the e-book additionally receive a right away effect and knowing of dislocation dynamics.
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Additional info for Dislocation Dynamics During Plastic Deformation
Accordingly, in situ straining experiments can also be performed in an X-ray topography arrangement to directly observe the processes controlling the dislocation motion. This requires dedicated straining stages to be positioned on the goniometer head of the X-ray topographic device. However, there are two diﬀerences with respect to TEM. The highenergy photons have a much higher penetration power compared to the electrons of usual energies, and so crystals of bulk dimensions can be observed. Besides, the width of the dislocation images is considerably greater than in TEM diﬀraction contrast, resulting in a poor resolution power for dislocations.
1 that the motion of the dislocations is realized by the formation and sidewise spreading of the kinks. In contrast to that, the slip planes of the jogs J (shaded areas) are not identical with the slip plane of the other segments of the dislocation. The slip plane of a jog in the edge part E of the dislocation loop extends perpendicular to the main course of the dislocation. Thus, the jog can glide together with the dislocation if the dislocation loop is enlarged by plastic deformation. However, the slip plane of a jog in the screw part S of the loop extends parallel to the general course of the dislocation.
Besides, the edges of the central thin area have to be thin enough to cope with the maximum load of the stage, that is, about 10 μm. Depending on the material, this shape can be produced by grinding, dimpling, and ﬁnal ion milling, or by chemical 24 2 Experimental Methods Fig. 8. View of the high-voltage electron microscope equipped for in situ straining experiments. In the center, the microscope column and the control desk. At the top right of the column, an extra turbo pump for improving the vacuum in the specimen chamber.
Dislocation Dynamics During Plastic Deformation by Ulrich Messerschmidt