Work Hardening
The strengthening of a metal by plastic deformation, caused by dislocation multiplication and entanglement obstructing further slip.
Governing formula
σ_y = σ₀ + α G b √ρ_dislocation (Taylor Relation)
SI unit
MPa (Increased Yield Strength)
In depth
Also known as strain hardening or cold working. Deforming a metal increases dislocation density ρ_dislocation. Dislocations intersect and form tangles that pin one another, requiring higher shear stress to continue plastic deformation.
Examples in the real world
Cold-rolling sheet metal to increase its yield strength and hardness.