Microstructure and mechanical properties of pure Cu processed by high-pressure torsion

Kaveh Edalati, Tadayoshi Fujioka, Zenji Horita

Research output: Contribution to journalArticle

171 Citations (Scopus)

Abstract

Pure Cu was subjected to severe plastic deformation through high-pressure torsion (HPT) using disc and ring samples. Vickers microhardness was measured across the diameter and it was shown that all hardness values fall well on a unique single curve regardless of the types of the HPT samples when they are plotted against the equivalent strain. The hardness increases with an increase in the equivalent strain at an early stage of straining but levels off and enters into a steady-state where the hardness remains unchanged with further straining. It was confirmed that the tensile strength also follows the same single function of the equivalent strain as the hardness. The elongation to failure as well as the uniform elongation also exhibits a single unique function of the equivalent strain. Transmission electron microscopy showed that a subgrain structure develops at an early stage of straining with individual grains containing dislocations. The subgrain size decreases while the misorientation angle increases and more dislocations are formed within the grains with further straining. In the steady-state range, some grains appear which are free from dislocations, suggesting that recrystallization occurs during or after the HPT process. The mechanism for the grain refinement was discussed in terms of dislocation mobility.

Original languageEnglish
Pages (from-to)168-173
Number of pages6
JournalMaterials Science and Engineering A
Volume497
Issue number1-2
DOIs
Publication statusPublished - Dec 15 2008

Fingerprint

Torsional stress
torsion
hardness
Hardness
mechanical properties
Mechanical properties
microstructure
Microstructure
elongation
Elongation
Grain refinement
misalignment
Microhardness
microhardness
tensile strength
plastic deformation
Plastic deformation
Tensile strength
Transmission electron microscopy
transmission electron microscopy

All Science Journal Classification (ASJC) codes

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

Cite this

Microstructure and mechanical properties of pure Cu processed by high-pressure torsion. / Edalati, Kaveh; Fujioka, Tadayoshi; Horita, Zenji.

In: Materials Science and Engineering A, Vol. 497, No. 1-2, 15.12.2008, p. 168-173.

Research output: Contribution to journalArticle

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