Thermodynamic analysis of the phase equilibria in the Nb-Ni-Zr system

Tatsuya Tokunaga, Satoshi Matsumoto, Hiroshi Ohtani, Mitsuhiro Hasebe

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


A thermodynamic study of phase equilibria in the Nb-Ni-Zr system has been carried out experimentally and using CALPHAD method. To enable the thermodynamic description of the constituent binary systems, the results from a previous evaluation were adopted for the Nb-Ni, Ni-Zr and Nb-Zr systems. However, some modifications of thermodynamic parameters of the Ni-Zr system were made based on the recent experimental data on binary and ternary phase equilibria. The phase boundaries involving the liquid phase in the Nb-Ni-Zr ternary system at a constant 60 mol%Ni and 20 mol%Zr were determined experimentally by differential scanning calorimetry (DSC). Thermodynamic parameters of the Nb-Ni-Zr ternary system were evaluated by combining the experimental results from DSC with the reported phase boundaries of the isothermal sections at 773 and 1073 K. The calculated results reproduced the present DSC results as well as the experimental isothermal sections. Furthermore, the amorphous-forming ability of Nb-Ni-Zr ternary alloys has been evaluated by incorporating the thermodynamic properties from the phase diagram calculations into the Davies-Uhlmann kinetic formulations. The calculated critical cooling rates in the observed metallic glass forming compositional range were found to be lower than those in the observed amorphous forming range by one or more orders of magnitude.

Original languageEnglish
Pages (from-to)741-749
Number of pages9
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Issue number9
Publication statusPublished - 2006 Sept
Externally publishedYes


  • Amorphous-forming ability
  • Calculation of phase diagrams (CALPHAD)
  • Critical cooling rate
  • Liquidus surface
  • Phase diagram
  • Thermodynamic analysis

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry


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