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Write down three stages of a cold-worked copper that is heat treated and explain them briefly.
Write down three stages of a cold-worked copper that is heat treated and explain them briefly.
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Expert Solution
Solution :
three stages of a cold-worked copper that is heat treated ate as follows :
1 Recovery
2. recrystallization
3. Grain Growth
The first stage is recovery, and it results in softening of the metal through removal of primarily linear defects called dislocations and the internal stresses they cause. Recovery occurs at the lower temperature stage of all annealing processes and before the appearance of new strain-free grains. The grain size and shape do not change.The second stage is recrystallization, where new strain-free grains nucleate and grow to replace those deformed by internal stresses. If annealing is allowed to continue once recrystallization has completed, then grain growth (the third stage) occurs. In grain growth, the microstructure starts to coarsen and may cause the metal to lose a substantial part of its original strength. This can however be regained with hardening.
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