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

Jeno Gubicza, Nguyen Q. Chinh, János L. Lábár, Zoltán Hegedus, Terence G. Langdon

Research output: Contribution to journalArticle

62 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)752-760
Number of pages9
JournalMaterials Science and Engineering A
Volume527
Issue number3
DOIs
Publication statusPublished - Jan 15 2010

Keywords

  • Equal-channel angular pressing
  • Recovery
  • Recrystallization
  • Severe plastic deformation
  • Stacking fault energy
  • Ultrafine-grained materials

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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