Bulky averaged microscopic information for ecap-processed cu using accelerator-based gamma-ray-induced positron annihilation spectroscopy and neutron diffraction

Toshihiro Ishibashi, Yo Tomota, Satoshi Sugaya, Hiroyuki Toyokawa, Tetsuya Hirade, Zenji Horita, Hiroshi Suzuki

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Bulky averaged microstructural parameters such as vacancy density, texture and intergranular stress for 99.99% Cu subjected to equalchannel angular pressing (ECAP) were investigated using accelerator-based gamma-ray-induced positron annihilation spectroscopy (AIPAS) and neutron diffraction. The Doppler-broadening parameter S for the AIPAS positron annihilation peaks increased after the first ECAP cycle and then decreased slightly with additional ECAP cycles. When the samples were annealed, the S value for the sample subjected to eight ECAP cycles was found to decrease at a lower temperature than that for the sample subjected to one ECAP cycle. The texture and intergranular stresses generated by ECAP were determined by neutron diffraction analyses. Changes in full width at half maximum and intensity of the (111) and (200) neutron diffraction peaks monitored in situ during annealing indicated the early onset of recrystallization in the sample subjected to eight ECAP cycles. These bulky averaged data show good agreement with both local scanning electron microscopy/electron backscatter diffraction observations and the results of mechanical tests.

Original languageEnglish
Pages (from-to)1562-1569
Number of pages8
JournalMaterials Transactions
Volume54
Issue number9
DOIs
Publication statusPublished - Sep 4 2013

Fingerprint

Positron annihilation spectroscopy
pressing
Neutron diffraction
positron annihilation
Gamma rays
Particle accelerators
neutron diffraction
accelerators
gamma rays
Textures
diffraction
spectroscopy
cycles
Positron annihilation
Doppler effect
Full width at half maximum
Electron diffraction
Vacancies
Annealing
textures

All Science Journal Classification (ASJC) codes

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

Cite this

Bulky averaged microscopic information for ecap-processed cu using accelerator-based gamma-ray-induced positron annihilation spectroscopy and neutron diffraction. / Ishibashi, Toshihiro; Tomota, Yo; Sugaya, Satoshi; Toyokawa, Hiroyuki; Hirade, Tetsuya; Horita, Zenji; Suzuki, Hiroshi.

In: Materials Transactions, Vol. 54, No. 9, 04.09.2013, p. 1562-1569.

Research output: Contribution to journalArticle

Ishibashi, Toshihiro ; Tomota, Yo ; Sugaya, Satoshi ; Toyokawa, Hiroyuki ; Hirade, Tetsuya ; Horita, Zenji ; Suzuki, Hiroshi. / Bulky averaged microscopic information for ecap-processed cu using accelerator-based gamma-ray-induced positron annihilation spectroscopy and neutron diffraction. In: Materials Transactions. 2013 ; Vol. 54, No. 9. pp. 1562-1569.
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