Phase equilibria and stability of the BCC aluminide in the Co-Cr-Al system

K. Ishikawa, M. Ise, I. Ohnuma, R. Kainuma, K. Isfaida

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Phase equilibria and ordering reactions in the bcc aluminides of the Co-Cr-Al systems over a temperature range of 1000-1350°C have been investigated mainly by the diffusion couple method. The compositions of the γ (Al: fcc-Co), β (B2: CoAl), α (A2: bcc-Cr) and σ (sigma phase: D8b) phases in equilibrium, and the critical boundaries of the A2/B2 continuous ordering transition in the bcc phase region have been determined. It is shown that both continuous and discontinuous A2 10 B2 phase ordering transitions and elliptic-ally shaped A2+B2 miscibiilly gap isiands with wide composition ranges exist in these systems in isothermal sections. The phase equilibria involving the γ, β, α and σ phases are presented and stability of the ordered bcc aluminides is discussed.

Original languageEnglish
Pages (from-to)1206-1210
Number of pages5
JournalBerichte der Bunsengesellschaft/Physical Chemistry Chemical Physics
Issue number9
Publication statusPublished - 1998


  • Metals
  • Order-Disorder Transition
  • Phase Equilibria
  • Phase transitions
  • Thermodynamics


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