Vacancy clustering and relaxation behavior in rapidly solidified B2 FeAl ribbons

T. Haraguchi, K. Yoshimi, M. H. Yoo, H. Kato, S. Hanada, A. Inoue

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

The clustering and relaxation behavior of supersaturated thermal vacancies under annealing at 723 K and subsequent secondary defect formation were investigated in rapidly solidified Fe-40.4, 49.9 and 50.0 at.%Al ribbons by X-ray diffractometry, density measurement, differential scanning calorimetry, scanning electron microscopy, atomic force microscopy and transmission electron microscopy. Supersaturated thermal vacancies of ≈0.3-2.5% were frozen into the as-spun ribbon. Most of the supersaturated vacancies were annihilated during a heat treatment, and the amount of annihilated vacancies was larger for a higher Al content. A large number of mesopores as well as dislocations were observed after the heat treatment, and the size of mesopores increased with increasing Al content. The results obtained suggest that mesopore formation is induced by clustering of supersaturated thermal vacancies. The activation enthalpy and kinetics of the vacancy clustering are discussed.

Original languageEnglish
Pages (from-to)3751-3764
Number of pages14
JournalActa Materialia
Volume53
Issue number13
DOIs
Publication statusPublished - 2005 Aug 1

Keywords

  • Annealing
  • Iron aluminides
  • Melt spinning
  • Mesostructure
  • Vacancies

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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