Gubicza, J, Chinh, N.Q., Lábár, J.L., Hegedüs, Z. and Langdon, T.G.
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 , 527, (3), . (doi:10.1016/j.msea.2009.08.071).
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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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