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In
hot work, a material is plastically deformed at a high enough temperature
for work hardening and recovery processes to be in balance during the deformation.
Recrystallization and dislocation annihilation by climb and thermally assisted
cross-slip maintain the ductility of the sample.
The
temperature at which hot work is performed should also take phase diagram
information into account. The rate of work hardening is dependent on the
phases present in a material. An alloy that has two phases at room temperature
but becomes a single phase alloy at higher temperatures will work harden
less in the single phase condition (and recovery processes will also be
more rapid because of the elevated temperature). |
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