Bulky Averaged Microscopic Information for ECAP-Processed Cu Using Accelerator-Based Gamma-Ray-Induced Positron Annihilation Spectroscopy and Neutron Diffraction

• Ishibashi Toshihiro

  Graduate School of Science and Engineering/Frontier Research Center for Applied Atomic Science, Ibaraki University

• Tomota Yo

  Graduate School of Science and Engineering/Frontier Research Center for Applied Atomic Science, Ibaraki University

• Sugaya Satoshi

  Graduate School of Science and Engineering/Frontier Research Center for Applied Atomic Science, Ibaraki University

• Toyokawa Hiroyuki

  National Institute of Advanced Industrial Science and Technology

• Hirade Tetsuya

  Nuclear Science and Engineering Directorate, Japan Atomic Energy Agency

• Horita Zenji

  WPI, International Institute for Carbon-Neutral Energy Research (WPI-12CNER), Kyushu University Department of Materials Science, Faculty of Engineering, Kyusyu University

• Suzuki Hiroshi

  Quantum Beam Science Directorate, Japan Atomic Energy Agency

Abstract

Bulky averaged microstructural parameters such as vacancy density, texture and intergranular stress for 99.99% Cu subjected to equal-channel 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.

Journal

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 54 (9), 1562-1569, 2013

  The Japan Institute of Metals and Materials

Keywords

• equal-channel angular pressing
• copper
• accelerator-based gamma-ray-induced positron annihilation spectroscopy
• neutron diffraction
• electron back scatter diffraction

Details

• CRID: 1390001204249685504
• NII Article ID: 10031194636
• NII Book ID: AA1151294X
• DOI: 10.2320/matertrans.mh201310
• COI: 1:CAS:528:DC%2BC3sXhslejtrrE
• ISSN: 13475320
• ISSN: 13459678
• NDL BIB ID: 024794858
• Web Site: http://id.ndl.go.jp/bib/024794858
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I024794858
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/54/9/54_MH201310/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed