Microstructures of graphite mechanically milled under hydrogen gas or argon gas atmosphere with zirconia balls or chromium steel balls

Eishi Tanabe, Yasuyuki Kitano, Kazushi Yamada, Minehiro Miyamoto, Yoshikazu Ohtani, Shinichi Orimo, Takayuki Ichikawa, Hironobu Fujii

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Microstructures of graphite mechanically milled under a hydrogen gas or an argon gas atmosphere using zirconia balls as well as chromium steel balls were investigated. Using transmission electron microscopes, high-resolution transmission electron microscopy (HREM), selected area electron diffraction (SAD), electron energy loss spectroscopy (EELS) and energy dispersive X-ray analysis (EDS) were carried out to compare the microstructures. Hydrogen concentration reaches up to 7.4 mass% after 80 h milling under a hydrogen gas atmosphere using chromium steel balls and homogeneous distribution of iron nano crystals was observed. No significant difference was observed in microstructures of 80 h milled graphite under the different gas atmosphere using the balls of different materials. This suggests that the significant absorption of hydrogen into the mechanically milled graphite strongly relates to the iron nano crystals included there.

Original languageEnglish
Pages (from-to)113-120
Number of pages8
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume69
Issue number1
DOIs
Publication statusPublished - 2005 Jan 1

Keywords

  • Analytical electron microscopy
  • Electron energy loss spectroscopy
  • Graphite
  • High-resolution electron microscopy
  • Hydrogen absorption
  • Mechanical milling
  • Selected area electron diffraction
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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