전북대학교
Simulation of Dislocation Motion
A dislocation is a line-shaped defect that exists within solid materials. The movement of dislocations plays a critical role in the plastic deformation of these materials. Thus, a comprehensive understanding of dislocations is essential for elucidating the mechanisms underlying plastic deformation. However, experimentally observing dislocations necessitates the use of high-performance microscopes capable of imaging at very small scales.
Observing dislocations presents significant challenges, leading to over a century of primarily qualitative research on dislocation concepts since their inception. However, recent advancements in computational power have facilitated a more active exploration of dislocations through simulation techniques. Dislocation dynamics is one such approach that calculates the attractive and repulsive interactions among multiple dislocations and simulates their subsequent movement.
Our research team utilizes dislocation dynamics to model dislocation motion and quantitatively assess dislocation-based deformation mechanisms. The figure below demonstrates that the presence of a dislocation jog markedly reduces dislocation velocity.
