Recrystallization Theoretical & Practical Aspects - Materials Science ...

Intro
Recrystallization
Lab 1
Grain
Boundaries
Grain Boundary Structure
• High angle boundaries: can be thought of as two
crystallographic planes joined together (with or w/o a
twist of the lattices).
• Low angle boundaries are arrays (walls) of
dislocations: this is particularly simple to understand
for pure tilt boundaries [to be explained].
• Grain boundary energy increases monotonically with
misorientation as a consequence of increasing
dislocation density.
• Transition: in the range 10-15°, the dislocation
structure changes to a high angle boundary
structure.
• The grain boundary mobility increases abruptly at
this transition in structure.
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