Aluminum Deoxidation Equilibrium in Molten Fe-Co Alloys

Jonah Gamutan, Kosei Akaishi, Takahiro Sato, Takahiro Miki

Research output: Contribution to journalArticlepeer-review


Aluminum deoxidation equilibrium of molten Fe-Co alloy was experimentally measured using a chemical equilibrium method and numerically assessed using a sub-regular solution model based on Darken's quadratic formalism and a Redlich-Kister type polynomial at 1 873 K. It was found that the degree of oxygen content reduction by Al-deoxidation decreased with increasing cobalt concentration in the alloy, peaking at around 40 to 60 mass% Co, and then improved with further increase in cobalt concentration. The following binary interaction parameters between cobalt and aluminum were derived in this study: {equation presented} It was also found that the above binary interaction parameters can accurately determine Al-deoxidation equilibrium of pure liquid cobalt. Finally, the critical point at which Al2O3 and CoO·Al2O3 coexist throughout the whole composition range of the alloy was also estimated from the experimental results in this study.

Original languageEnglish
Pages (from-to)12-19
Number of pages8
JournalIsij International
Issue number1
Publication statusPublished - 2022


  • Al-deoxidation equilibrium
  • Fe-Co alloys
  • Quadratic formalism
  • Redlich-Kister polynomial

ASJC Scopus subject areas

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


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