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Investigation of collective behaviour of lattice defects by the acoustic emission technique
 Molnárová, Orsolya ; Dobroň, Patrik (advisor) ; Lukáč, Pavel (referee)
The Portevin-Le Chatelier effect is a macroscopic, spatio-temporal instability of plastic deformation. This phenomenon appears in some industrially important metallic alloys, e.g. based on iron, aluminum or magnesium if these materials are deformed at suitable temperature and strain rate. The effect is manifested as stress fluctuations (serrations) on deformation curves, which corresponds to macroscopic and localized events of plastic deformation in the material. It demonstrates a nonlinear cooperative motion of dislocations (line defects of the microstructure) during plastic deformation. Study of nonlinear aspects of dislocation dynamics is of great importance for understanding the patterns of plastic deformation. It also brings a considerable application potential for the design of novel structural materials. By the collective motion of dislocations the stress fields of the structural defects interact and release mechanical energy in form of elastic waves. These waves can easily be detected by the acoustic emission technique.
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