Alloying effects on the phase equilibria among Ni(A1), Ni 3Al(L1 2) and Ni 3V(D0 22) phases

Satoru Kobayashi, Kazuhisa Sato, Eiki Hayashi, Toshihiro Osaka, Toyohiko J. Konno, Yasuyuki Kaneno, Takayuki Takasugi

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


The effects of alloying elements (Ti, Nb, Ta, Cr, W, Re, Co and Si) on the phase equilibria among Ni (A1), Ni 3Al (L1 2) and Ni 3V (D0 22) phases were studied by means of microstructure observation and energy dispersive spectroscopy analysis on thin foils. It was found that the alloying elements can be classified into four categories: (a) Ti stabilizing the phases in the order: L1 2 > D0 22 > A1, (b) Nb and Ta stabilizing the phases: D0 22 > L1 2 > A1, (c) Cr, W, Re and Co stabilizing the phases: A1 > D0 22 > L1 2, (d) Si stabilizing the phases: Al > L1 2 > D0 22. The elements in the categories (a) and (b) raise the temperature of a eutectoid-type reaction (A1 → L1 2 + D0 22) while the elements in the category (c) reduce the temperature. The alloying effects were examined in terms of mixing enthalpy and electron concentration.

Original languageEnglish
Pages (from-to)68-75
Number of pages8
Publication statusPublished - 2012 Apr


  • A. Multiphase intermetallics
  • B. Phase diagrams
  • D. Microsttucture
  • F. Electron microscopy
  • Transmission

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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