Equilibrium between titanium and oxygen in liquid Fe-Ti alloy coexisted with titanium oxides at 1873K

Woo Yeol Cha, Tetsuya Nagasaka, Takahiro Miki, Yasushi Sasaki, Mitsutaka Hino

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)

Abstract

The equilibrium between Ti and O has been investigated in molten Fe-Ti alloy saturated with various kinds of titanium oxides at 1 873 K. The present results have been thermodynamically analyzed applying Wagner's formalism as well as Darken's quadratic formalism with the excess Gibbs free energy change of mixing described by Redlich-Kister type polynomial. The equilibrium constants and the interaction parameters of Wagner's formalism were given as follows at 1 873 K in the present work. Ti2O3(s)=2Ti+3O (0.5<mass%Ti<6.2) log K=-10.17, eoTi=-0.34 ′Ti3O5′(s)=3Ti+5O (0.0004<mass%Ti<0.36) log K=-16.86, eoTi=-0.34 The Henry constant of Ti in liquid Fe-Ti alloy was assessed as follows at 1 873 K. γ Ti(l)o=0.0090 The interaction parameters of Redlich-Kister type polynomial for molten Fe-Ti-O alloy were given by the following values at 1 873 K in the present work. 0ΩFe-Ti=-73360/J 0ΩTi-O=-1035900/J The estimated results based on Wagner's formalism as well as Darken's quadratic formalism polynomials were well agreed with the experimental results which were observed between Ti and O equilibrium contents in molten Fe-Ti alloy.

Original languageEnglish
Pages (from-to)996-1005
Number of pages10
JournalIsij International
Volume46
Issue number7
DOIs
Publication statusPublished - 2006

Keywords

  • Interaction parameter
  • Phase equilibria
  • Quadratic formalism
  • Redlich-Kister polynomial
  • Thermodynamics
  • Ti deoxidation equilibrium
  • Titanium oxides

ASJC Scopus subject areas

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

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