Heat treatment effects on self-assembling process of supersaturated thermal vacancies in B2-type FeAl and NiAl

Masafumi Tsunekane, Kyosuke Yoshimi, Kouichi Maruyama

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A large number of thermal vacancies are frozen into B2-type aluminides in supersaturation by rapid cooling. In this paper, the self-assembling behavior of supersaturated thermal vacancies in FeAl and NiAl was investigated using single crystals by different scanning calorimetry (DSC) and transmission electron microscopy (TEM). Two irreversible exothermic peaks were observed in the DSC curve of FeAl single crystals quenched from high temperature. The density and arrangement of dislocations formed inside the FeAl single crystals varied widely in the temperature range corresponding to the larger exothermic reaction, and the size of pores formed near surfaces increased with increasing temperature. An irreversible exothermic peak was also observed in the DSC curve of NiAl single crystal. The density and arrangement of dislocations formed inside the NiAl single crystals hardly varied in the temperature range corresponding to the exothermic reaction, but the size of pores formed near surfaces increased with increasing temperature.

Original languageEnglish
Title of host publicationProceedings of the 17th IFHTSE Congress
PublisherThe Japan Society for Heat Treatment (JSHT)
Pages292-295
Number of pages4
ISBN (Electronic)9780000000002
Publication statusPublished - 2009 Jan 1
Event17th International Federation for Heat Treatment and Surface Engineering Congress 2008, IFHTSE 2008 - Kobe, Japan
Duration: 2008 Oct 262008 Oct 28

Publication series

NameProceedings of the 17th IFHTSE Congress
Volume1

Other

Other17th International Federation for Heat Treatment and Surface Engineering Congress 2008, IFHTSE 2008
CountryJapan
CityKobe
Period08/10/2608/10/28

Keywords

  • B2-type aluminides
  • Differential scanning calorimetry (DSC)
  • Point defects
  • Transmission electron microscopy (TEM)
  • Vacancies

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Mechanics of Materials

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