An investigation on shear banding and crystallographic texture of Ag–Cu alloys deformed by high-pressure torsion

Pradipta Ghosh, Karoline S. Kormout, Juraj Todt, U. Lienert, Jozef Keckes, Reinhard Pippan

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Ag–Cu alloys of two different initial microstructures—a cast eutectic alloy (AgCu-E) and an equivolume Ag–Cu powder mixture (AgCu-P)—were deformed by high-pressure torsion. The codeformation of Ag and Cu grains led to uniform refinement and a nanolamellar microstructure for both alloys. However, the lamellar structure in AgCu-P alloys was broken at intermediate shear strains (γ > 150) by extensive shear banding. On the other hand, no shear banding was observed for AgCu-E alloy at similar microstructural refinement. At higher strains deformation induced intermixing of Ag and Cu atoms was observed. Further, three-dimensional diffraction analysis of AgCu-E alloy showed that in contrast to conventional single phase alloys, the Ag and Cu phases develop similar crystallographic texture.
Original languageEnglish
Pages (from-to)794-806
Number of pages13
JournalProceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
Issue number3
Publication statusE-pub ahead of print - 2 Mar 2018


  • crystallographic texture
  • nanocrystalline
  • severe plastic deformation
  • Shear band
  • X-ray diffraction

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