Use of ring sample for high-pressure torsion and microstructural evolution with equivalent strain

Yuki Ito, Yosuke Harai, Tadayoshi Fujioka, Kaveh Edalati, Zenji Horita

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Citations (Scopus)

Abstract

This study introduces a process of high-pressure torsion (HPT) using ring samples and compares with the results of conventional disk HPT. Both types of HPT were conducted at room temperature on pure Al and pure Cu. The microhardness was measured along the diameters of the disks and rings. Microstructures were examined using transmission electron microscopy. When hardness values were plotted against equivalent strain, all data points fell on a single line for each material. There was a hardness maximum for pure Al but no such a maximum was present in pure Cu. In pure Al, many dislocations were visible within grains up to the equivalent strain corresponding to the hardness maximum but beyond this strain, grains with low dislocation density appear. All materials exhibited steady state where the hardness remains constant with respect to imposed equivalent strain. This study concludes that use of ring samples is effective as an alternative to the disk samples.

Original languageEnglish
Title of host publicationMaterials Science Forum - Nanomaterials by Severe Plastic Deformation 4 - 4th International Conference on Nanomaterials by Severe Plastic Deformation
EditorsYuri Estrin, Yuri Estrin, Hans Jurgen Maier
PublisherTrans Tech Publications Ltd
Pages191-196
Number of pages6
ISBN (Print)9770255547605, 9780878493753
Publication statusPublished - Jan 1 2008
Event4th International Conference on Nanomaterials by Severe Plastic Deformation - Goslar, Germany
Duration: Aug 18 2008Aug 22 2008

Publication series

NameMaterials Science Forum
Volume584-586 PART 1
ISSN (Print)0255-5476

Other

Other4th International Conference on Nanomaterials by Severe Plastic Deformation
CountryGermany
CityGoslar
Period8/18/088/22/08

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All Science Journal Classification (ASJC) codes

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

Cite this

Ito, Y., Harai, Y., Fujioka, T., Edalati, K., & Horita, Z. (2008). Use of ring sample for high-pressure torsion and microstructural evolution with equivalent strain. In Y. Estrin, Y. Estrin, & H. J. Maier (Eds.), Materials Science Forum - Nanomaterials by Severe Plastic Deformation 4 - 4th International Conference on Nanomaterials by Severe Plastic Deformation (pp. 191-196). (Materials Science Forum; Vol. 584-586 PART 1). Trans Tech Publications Ltd.