Question

Slip occurs on planes with:

• A. Maximum bond strength
• B. Highest energy
• C. Highest atomic density
• D. Random orientation

Hint:

Slip occurs on the most closely packed planes — those with the highest atomic density — because they offer the easiest path for dislocation movement.

Answer 1

The Correct Option is C

Slip is the mechanism of plastic deformation in crystalline materials, and it occurs most easily along specific crystallographic planes and directions known as slip systems.
The planes with the highest atomic density, often referred to as close-packed planes, have atoms arranged very tightly. These planes offer the least resistance to dislocation motion, making it easier for layers of atoms to slide over one another.
- For example, in FCC crystals, the \((111)\) plane is the most densely packed, making it the most common slip plane.
- In contrast, planes with maximum bond strength or random orientation do not favor slip. - Highest energy planes are unstable and not necessarily favorable for dislocation glide.
Therefore, the correct answer is the plane with highest atomic density.