Recrystallization ( metallurgy )

jamesabc · Apr 23, 2009

i read up recrystallization on wikipedia and it said

"Recrystallization is a process by which deformed grains are replaced by a new set of undeformed grains that nucleate and grow until the original grains have been entirely consumed."

so is recrystallization where the molecules and atoms change their orientation and shape? is that the same as what is stated above?

Astronuc · Apr 23, 2009

The grain boundaries have more energy because of the local mismatch in crystal/lattice orientation. Usually the grain boundaries sweep through the smaller grains, which produces larger grains.

In material that has been worked, there are dislocation networks, and these networks can coalesce and produce (nucleate) new grain boundaries, and the smaller grains can 'disappear' into the larger grains.

In a polycrystalline material, adjacent grains have different lattice orientations. Recrystallization does affect texture (predominant grain orientation) but it is not necessarily significant.

Mapes · Apr 23, 2009

Not quite. The key idea is that new crystals (regular arrangements of atoms with few defects) form and grow, replacing the old crystals that are deformed and filled with defects. The process does involve the movement of atoms and molecules. Imagine restacking a pile of rigid spheres that has become shifted and disorganized.

EDIT: My "not quite" was in response to the first post.

jamesabc · Apr 24, 2009

so during recrystallization crystals actually do not move as such but do change shape by growing smaller and or larger? also by grains and crystals you mean a group of molecules that gather together to make up a larger body.

im still trying to learn about this new topic. thanks

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Recrystallization ( metallurgy )

jamesabc

Astronuc

Staff: Mentor

Mapes

jamesabc

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