Chapter 7.6 - Recovery recrystallization and grain growth...

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26 MSE 2090: Introduction to Materials Science Chapter 7, Strengthening Recovery, recrystallization, and grain growth ¾ Plastic deformation increases dislocation density (single and polycrystalline materials) and changes grain size distributions (polycrystalline materials). ¾ This corresponds to stored strain energy in the system (dislocation strain fields and grain distortions). ¾ When applied external stress is removed - most of the dislocations, grain distortions and associated strain energy are retained. ¾ Restoration to the state before cold-work can be done by heat-treatment and involves two processes: recovery and recrystallization . These may be followed by grain growth .
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