Influence of vacuum annealing conditions on the surface oxidation and vacancy condensation in the surface of an FeAl single crystal

A. Yamauchi, M. Tsunekane, Kazuya Kurokawa, Shuji Hanada, Kyosuke Yoshimi

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The influence of annealing atmosphere, temperature and time on the surface oxidation and vacancy condensation behavior of {111}-oriented single crystals of B2-type FeAl was investigated. AFM observation showed that as-annealed surfaces under a high vacuum were rugged and covered with a thin oxide film. The results obtained by TEM indicated that the thin oxide film was {001}-oriented κ-Al2O3 epitaxially grown on the {111}-oriented FeAl surface. AES measurements showed that the thickness of the oxide film was almost twice as thick as that of the passive Al2O3 film formed on the FeAl surface in an ambient atmosphere. It was found that the growth of surface mesopores is attributable to both the condensation of supersaturated vacancies in FeAl substrate and the Kirkendall effect by the surface oxidation during the vacuum annealing. Crown

Original languageEnglish
Pages (from-to)412-416
Number of pages5
JournalIntermetallics
Volume18
Issue number4
DOIs
Publication statusPublished - 2010 Apr 1

Keywords

  • A. Iron aluminides
  • B. Oxidation
  • D. Defects: point defect
  • F. Microscopy, various

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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