Microstructure of low stacking fault energy silver processed by different routes of severe plastic deformation

Zoltán Hegeds, J. Gubicza, Megumi Kawasaki, N. Chinh, Zsolt Fogarassy, Terence G. Langdon

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Samples of 4 N purity Ag were processed at room temperature (RT) by equal-channel angular pressing (ECAP) and high-pressure torsion (HPT) up to 8 passes and 20 revolutions, respectively. It was found that the minimum grain size was around 200 nm for both ECAP and HPT. However, the dislocation density and the twin boundary frequency were about three times larger in HPT due to the very high applied hydrostatic pressure. The maximum dislocation density (about 1.5 × 10 16 m -2) and twin boundary frequency (about 2%) achieved by HPT at RT are extremely high among pure fcc metals and this can be explained by the difficult annihilation of the highly dissociated dislocations due to the very low stacking fault energy in Ag.

Original languageEnglish
JournalJournal of Alloys and Compounds
Volume536
Issue numberSUPPL.1
DOIs
Publication statusPublished - Sep 25 2012

Fingerprint

Stacking faults
Silver
Torsional stress
Plastic deformation
Equal channel angular pressing
Microstructure
Hydrostatic pressure
Dislocations (crystals)
Metals
Temperature

Keywords

  • Dislocations
  • Equal-channel angular pressing
  • High-pressure torsion
  • Silver
  • Stacking fault energy
  • Twins

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Chemistry
  • Metals and Alloys

Cite this

Microstructure of low stacking fault energy silver processed by different routes of severe plastic deformation. / Hegeds, Zoltán; Gubicza, J.; Kawasaki, Megumi; Chinh, N.; Fogarassy, Zsolt; Langdon, Terence G.

In: Journal of Alloys and Compounds, Vol. 536, No. SUPPL.1, 25.09.2012.

Research output: Contribution to journalArticle

Hegeds, Zoltán ; Gubicza, J. ; Kawasaki, Megumi ; Chinh, N. ; Fogarassy, Zsolt ; Langdon, Terence G. / Microstructure of low stacking fault energy silver processed by different routes of severe plastic deformation. In: Journal of Alloys and Compounds. 2012 ; Vol. 536, No. SUPPL.1.
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