Equal-channel angular pressing and high-pressure torsion of pure copper: Evolution of electrical conductivity and hardness with strain

Kaveh Edalati, Kazutaka Imamura, Takanobu Kiss, Zenji Horita

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Pure Cu (99.99%) is processed by equal-channel angular pressing (ECAP) and by high-pressure torsion (HPT). The electrical resistivity as well as the microhardness increases with an increase in the equivalent strain at an early stage of straining, but saturates to a steady state at the equivalent strains more than ̃20. At the steady state, the samples processed by ECAP and HPT show a significant increase in the hardness (̃270%) but little decrease in the electrical conductivity (̃12%) when compared to the annealed state. Transmission electron microscopy confirms that the microstructure does not change at the saturated level with further straining. Evolutions of hardness, electrical conductivity and microstructures are also investigated after post-HPT annealing.

Original languageEnglish
Pages (from-to)123-127
Number of pages5
JournalMaterials Transactions
Issue number1
Publication statusPublished - Mar 21 2012


All Science Journal Classification (ASJC) codes

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

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