- Phenomenon where ductile metals become stronger and harder when they are deformed plastically is called strain hardening or work hardening.
- Increasing temperature lowers the rate of strain hardening. Hence materials are strain hardened at low temperatures, thus also called cold working.
- During plastic deformation, dislocation density increases. And thus their interaction with each other resulting in increase in yield stress.
- Strain hardening (work hardening) is the reason for the elastic recovery.
- The reason for strain hardening is that the dislocation density increases with plastic deformation (cold work) due to multiplication.
- The average distance between dislocations then decreases and dislocations start blocking the motion of each one
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