Observation of Dislocation Behavior in Graphite by Using Ultrasonic Atomic Force Microscopy(NDE3)

Abstract

We found a new type of dislocation motion in highly oriented pyrolytic graphite during subsurface observation by ultrasonic atomic force microscopy. As a load was applied to the tip, dislocations of apparently edge type (Frank partial dislocations) moved to the direction of climb over distances of tens of nanometers, and returned to the original position as the load was removed. To explain this motion, we propose a possible model where the extra half-plane of the dislocation is elastically compressed to shorten its length due to the applied load by the tip.