Plastic deformation processing forging

Plasticity. Slip, the gliding motion of full planes of atoms or partial planes, called dislocation, allows for the deformation processing of polycrystalline metals (forging, extrusion, rolling, swaging, and drawing). Slip occurs much more readily across close-packed planes in close-packed directions. 

If plastic deformations are large, as it is the case in metal working processes like deep drawing or forging, the elastic part of the deformation can be neglected and the law simplifies to... 

---