Question

The main mechanism of plastic deformation in metals is

• A. Twinning
• B. Slip
• C. Elastic bending
• D. Cracking

Hint:

Plastic Deformation Mechanisms. The primary mechanism in metals is Slip (movement of dislocations). Twinning is a secondary mechanism, important in some metals or conditions.

Answer 1

The Correct Option is B

Plastic deformation is permanent deformation that occurs when the applied stress exceeds the material's yield strength.
In crystalline materials like metals, the primary mechanism responsible for plastic deformation is slip.
Slip involves the movement of dislocations (line defects in the crystal lattice) along specific crystallographic planes (slip planes) and directions (slip directions).
This movement allows blocks of the crystal to slide relative to each other, resulting in macroscopic plastic deformation.
Twinning is another mechanism of plastic deformation but is generally less dominant than slip in most common metals under typical conditions.
Elastic bending is a reversible deformation.
Cracking is fracture, not plastic deformation.