Abstract
The influence of extrusion ratios in the range 6–60 on the structural changes in cold hydrostatically extruded copper of 99·9% purity has been investigated by means of light microscopy, transmission electron microscopy, differential scanning calorimetry, and by mechanical methods. The increase in temperature due to deformation work was assessed. The static and dynamic structural changes were separated by quenching. It was established that the thermal-softening effect is primarily the result of dynamic and post-dynamic recrystallization. It was shown also that the nucleation process, characteristic of a distinct drop in recrystallization temperature begins in the early stages of the process of deformation as a result of dynamic resovery. It was found that the only reason why the post-dynamic recrystallization process occurs is that the nucleation process takes place during the dynamic recovery.
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