Principles of self-annealing in silver processed by equal-channel angular pressing: the significance of a very low stacking fault energy

Gubicza, J, Chinh, N.Q., Lábár, J.L., Hegedüs, Z. and Langdon, T.G. (2010) Principles of self-annealing in silver processed by equal-channel angular pressing: the significance of a very low stacking fault energy. Materials Science and Engineering: A, 527 (3), 752-780. (doi:10.1016/j.msea.2009.08.071).

Abstract

Experiments were conducted to evaluate the long-term microstructural stability of silver after processing using equal-channel angular pressing (ECAP). The results show that an ultrafine-grained microstructure is produced by ECAP at room temperature but there is self-annealing in the form of recovery and recrystallization during long-term storage at room temperature. In practice, the very low stacking fault energy of silver results in a high degree of dislocation dissociation and thereby hinders recovery by cross-slip and climb. The experiments examine the evolution of microstructure and the mechanical behavior as a function of the storage time after different numbers of ECAP passes. The results demonstrate that the degree and kinetics of self-annealing depend upon the number of passes imposed in ECAP

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Contributors

Author: T.G. Langdon

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