Phase equilibria in the Fe-rich portion of the Fe-Ni-Si system

O. Ikeda, Y. Himuro, Ikuo Ohnuma, R. Kainuma, K. Ishida

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

Investigations relating to the phase equilibria involving the α, γ, σ and liquid phases and the ordering reactions in the bcc aluminides of the Fe-Ni-Si system in the temperature interval 800∼1200°C have been carried out by energy dispersion X-ray spectroscopic (EDS) analysis and transmission electron microscopy (TEM). The equilibrium compositions of the γ (A1: fcc-Fe), α (A2: bcc-Fe), σ (σ phase) and liquid phases and the critical boundaries of the continuous ordering transition in the α phase region have been determined. It is observed that the critical temperatures of the continuous ordering transitions α(A2)/a′(B2) and α′/α″(D03) are mainly functions only of Si content, and not of Ni. It is also found that the tie-line configurations and the partition behavior of the constituents at the α/γ phase equilibrium are strongly affected by the order-disorder transitions in the α phase. Results pertaining to these phase equilibria and the stability of the ordered bcc aluminides are presented and discussed.

Original languageEnglish
Pages (from-to)130-136
Number of pages7
JournalJournal of Alloys and Compounds
Volume268
Issue number1-2
DOIs
Publication statusPublished - 1998 Mar 27

Keywords

  • Diffusion couple
  • FeNiSi alloy
  • Order-disorder transition
  • Partition
  • Phase equilibrium

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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