Thermodynamic analysis of the Fe-Nb-B ternary system

Keita Yoshitomi, Yu Nakama, Hiroshi Ohtani, Mitsuhiro Hasebe

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

A thermodynamic analysis of the Fe-Nb-B ternary system has been carried out by estimating the unknown thermodynamic properties of various borides and solid solutions with using a first-principles method. The calculations showed that, at least in the ground state, the solid solution, in which the B atoms substitute for the Fe atoms, was more probable than that where the B atoms dissolved in the octahedral interstitial sites. Furthermore, the calculated values for the binary borides in the Fe-B and Nb-B systems were in reasonable agreement with those found by experiment. The thermodynamic properties such as formation enthalpies for the FeNbB and Nb3B2 phases were also determined for ternary borides. The thermodynamic functions determined using these theoretical values, as well as the available experimental information on the phase boundaries, successfully revealed the phase equilibria in the Fe-Nb-B ternary system over the entire composition and temperature ranges.

Original languageEnglish
Pages (from-to)835-844
Number of pages10
JournalIsij International
Volume48
Issue number6
DOIs
Publication statusPublished - 2008 Aug 25
Externally publishedYes

Keywords

  • Borides
  • CALPHAD
  • First-principles calculations
  • Phase diagram
  • Thermodynamic analysis

ASJC Scopus subject areas

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

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