2. Why does climb motion of an edge dislocation require vacancy diffusion ?

Expert Solution

Answer : Dislocation climb occurs by the diffusion of vacancies or atoms to or away from the site of the dislocation.Climb is diffusion controlled and movement of dislocations by climb is non-conservative.

Dislocation can be considered as a boundary between the slipped and unslipped parts of the crystal lying over slip plane.For edge dislocation,the intersection of the extra half plane of atoms with the slip plane is called dislocation line.Dislocations are non equilibrium defects. If an edge dislocation is ‘stuck’ at some obstacle on a particular slip plane, then it can continue to glide if climb can climb ‘above’ that slip plane. This way climb plays an important role in facilitating continued slip.Vacancy concentration in the cristal can decrease due to positive climb.

genius_generous answered 2 years ago

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