Dislocation
A 1D line defect or irregularity in a crystal lattice where atomic planes are misaligned, governing plastic deformation in metals.
Governing formula
Burgers Vector b (Edge: b ⊥ line; Screw: b ∥ line)
SI unit
nm (Burgers Vector Magnitude)
In depth
Gliding motion of dislocations across crystal slip planes allows metals to deform plastically at stress levels far lower than theoretical interatomic bond breaking strength. Grain boundaries and work hardening obstruct dislocation movement.
Examples in the real world
Work hardening of copper wire when bent repeatedly due to dislocation entanglement.