Stability of B2 ordered phase in the Ti-rich portion of Ti-Al-Cr and Ti-Al-Fe ternary systems

R. Kainuma, Ikuo Ohnuma, K. Ishikawa, K. Ishida

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

The stability region of the B2 phase at 1000 °C in the Ti-rich part of the Ti-Al-Cr and Ti-Al-Fe ternary systems are investigated by energy dispersive spectroscopy (EDS) and transmission electron microscopy (TEM) using two-phase alloys and diffusion couples. It is established that the critical boundaries of the A2/B2 continuous ordering transition are functions of both the Al and Fe or Cr contents, and the phase equilibria between the α2 and the β and between the β and FeTi (B2) phases are strongly affected by the A2/B2 order-disorder transition. By extrapolating these ternary data to the Ti-Al binary and using the Bragg-Williams-Gorsky approximation a metastable A2/B2 ordering boundary is postulated to exist at 1000 °C in the vicinity of 23.5 at%Al in the Ti-Al binary system.

Original languageEnglish
Pages (from-to)869-875
Number of pages7
JournalIntermetallics
Volume8
Issue number8
DOIs
Publication statusPublished - 2000 Aug

ASJC Scopus subject areas

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

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