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Climb
is the motion of an edge dislocation normal to its slip plane. The process
requires the addition or removal of atoms from the extra half plane of
the dislocation by diffusion processes. Climb is therefore favored at high
temperatures where point defects are mobile and their number is large.
The diagram illustrates an extra half plane that contains jogs. These locations
are favored for the removal or addition of point defects to the dislocation,
and, as shown, they move along the half plane as a result.
Climb
is one of the processes that can remove dislocations from a sample when
it is annealed at high temperatures. The dislocation is not favored by
thermodynamics because it increases the free energy of the sample. Its
removal by diffusion controlled climb is favored as this process lowers
the free energy of the sample. Climb is an important high temperature recovery
process. |
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