Phase Separation in Nearly Stoichiometric NiAl

  • Kato Masahiko
    Department of Mechanical Engineering, Graduate School of Engineering, Kogakuin University
  • Sasano Hisaoki
    National Research Institute for Metals
  • Suzuki Toshiyuki
    Department of Mechanical Engineering, Graduate School of Engineering, Kogakuin University

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  • 化学量論組成付近のNiAlにおける相分離

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Abstract

Authors previously reported that the interdiffusion coefficients of NiAl phase are extremely small near the stoichiometric composition below 1123 K, and that it is highly possible to induce phase separation. In this study, the microstructures of Ni-50 at%Al and Ni-48 at%Al alloys annealed at 1073 K for 8 h after slow cooling from 1623 K have been investigated by electron microscopy. The banded structure, which have major axis at right angles to ⟨\bar110⟩ direction, was observed firstly in both alloys of Ni-50 at%Al and Ni-48 at%Al near the stoichiometry. The banded structure implies the structural change in the plane parallel to the {110}. This suggests occurrence of phase separation in NiAl phase.

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