Abstract
Substructural aspects of instability of plastic deformation are investigated in copper at constant strain rate at elevated and high temperatures. Subgrain misorientation as a measure of deformation energy stored in a subboundary is specially studied. Characteristics of the substructure-mean misorientation and size-are used to assess synergetic characteristics of the substructural evolution. The results indicate that the system is very far from equilibrium in conditions of instability and evolves chaotically, probably correlated with substructural inhomogeneities and, in certain cases, with a hierarchic substructure. In this process conditions of dynamic recrystallization evolve by which the instability is manifested
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