Nanoscale AFM and TEM Observations of Elementary Dislocation by Jozef Veselý

By Jozef Veselý

This thesis addresses user-friendly dislocation strategies taking place in single-crystalline alloys according to Fe-Al, and investigates correspondences among dislocation distribution inside of crystals characterised via transmission electron microscopy (TEM) and floor styles saw utilizing atomic strength microscopy (AFM). Fe-Al alloys with assorted levels of ordering have been ready and deformed in compression at ambient temperature in-situ contained in the AFM gadget. The evolution of slip line buildings used to be captured within the sequences of AFM photographs and wavy slip bands, whereas move slip on the tip of the slip band and homogeneous high quality slip traces have been additionally pointed out. extra, the thesis develops a method for developing 3D representations of dislocations saw by means of TEM with out the prohibitive problems of tomography, and creates 3D types of dislocation buildings. normally talking, the thesis reveals sturdy contract among AFM and TEM observations, confirming the price of AFM as a appropriate instrument for learning dislocations.

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Fit of one scan-line segment is illustrated in Fig. 14. Parameters (h, p, w, a, b and c) are obtained independently for every scan-line segment. 6 Atomic Force Microscopy 33 Fig. 14 Fit of a scan-line segment illustrating the height (h), position ( p) and half width (w) parameters shape along the slip line are thus determined. The half-width parameter w is defined with respect to the used step function. In the case of hyperbolic tangent it represents the width where the step reaches 76 % (tanh(1)) of its total height.

First devices used 3 point bending [15, 16, 41] or compression [9] geometry to avoid problems with clamping of the specimen. The advantage of compression geometry it that it imposes homogeneous strain on the sample. Often a piezo element is used as a fine motion actuator to reduce the noise during the deformation. Due to the limited range of piezo element there is usually also some other means of coarse motion. Devices actuated by a stepper motor might require AFM to retract the tip between deformation steps [56].

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