Thermodynamic analysis of the phase equilibria of the Nb-Ni-Ti system

Satoshi Matsumoto, Tatsuya Tokunaga, Hiroshi Ohtani, Mitsuhiro Hasebe

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25 Citations (Scopus)

Abstract

A thermodynamic analysis of the Nb - Ni - Ti system has been performed following the CALPHAD technique. To enable the thermodynamic description of the binary systems, the results from a previous evaluation were adopted for the Nb - Ni, Nb - Ti. and Ni - Ti systems. However, a slight modification of the parameters was applied to the bcc and Nb6Ni7 phases in the Nb - Ni system, when considering the ternary phase equilibria. The phase boundaries of the Nb - Ni - Ti ternary system at a constant 28mol%Ni and 60mol%Ni were determined experimentally by differential scanning calorimetry. A thermodynamic assessment of the ternary system was performed based on the experimental information as well as the reported phase boundaries of the isothermal sections of the Nb - Ni - Ti system at 700, 800, and 900°C. Our calculations reveal that this system includes 15 types of ternary invariant reactions. The ternary eutectic temperature was between 901.6 and 1063.7°C.

Original languageEnglish
Pages (from-to)2920-2930
Number of pages11
JournalMaterials Transactions
Volume46
Issue number12
DOIs
Publication statusPublished - 2005 Dec 1

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Keywords

  • CALPHAD
  • Liquidas surface
  • Phase diagram
  • Thermodynamic analysis

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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