Formation of Ni5Al3 phase in Ni3Al/NiAl diffusion couples

Y. Ootoshi, K. Fujiwara, Z. Horita, M. Nemoto

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


Diffusion experiments have been conducted using the Ni3Al/NiAl couples at annealing temperatures of 873 and 923 K. It is shown that the Ni5Al3 phase forms between the Ni3Al and NiAl phases during the diffusion annealing. Optical microscopy, transmission electron microscopy and electron probe microanalysis (EPMA) are employed for the identification of the Ni5Al3 phase. Concentration profiles of Al across the diffusion-couple interfaces are measured using EPMA to determine the region of the Ni5Al3 single-phase in the Ni-Al binary phase diagram. Interdiffusion coefficients in the Ni5Al3 phase are also determined from the concentration profiles.

Original languageEnglish
Pages (from-to)225-229
Number of pages5
Journalmaterials transactions, jim
Issue number1
Publication statusPublished - 1998 Jan


  • Diffusion couple
  • Electron probe microanalysis
  • Interdiffusion coefficient
  • Intermefallics
  • NiAl
  • Nickel-aluminum phase diagram
  • Transmission electron microscopy


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