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Miscibility gap in Fe-Ni-Al and Fe-Ni-Al-Co systems

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Abstract

The phase equilibria in Fe-Ni-Al and Fe-Ni-Al-Co systems have been investigated by the diffusion couple technique, and the miscibility gap that separates α1 (Fe-rich disordered bcc phase) from α2 (NiAl-rich ordered bcc phase) has been determined. It has been ascertained that the three-dimensional shape of the miscibility gap is not simple helmetlike, but has a peculiar ridge at the order-disorder transition temperature. The miscibility gap is narrowed and shifted to the Fe-rich corner by the addition of Co, and Co atoms are distributed to the α2 rather than the α1 Furthermore, by alloying Co, the fcc γ phase is stabilized and the miscibility gap between α1 and α2 is hidden to some extent by the phase regions concerned with the γ phase.

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Authors and Affiliations

  1. Northeast Institute of Technology, Schenyang, China

    Shi Ming Hao (Lecturer)

  2. Manufacturing Engineering Research Center, Komatsu Ltd., Hirakata, Japan

    T. Takayama (Senior Engineer)

  3. Department of Materials Science, Faculty of Engineering, Tohoku University, 980, Sendai, Japan

    K. Ishida (Associate Professor) & T. Nishizawa (Professor)

Authors
  1. Shi Ming Hao
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  2. T. Takayama
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  3. K. Ishida
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  4. T. Nishizawa
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Hao, S.M., Takayama, T., Ishida, K. et al. Miscibility gap in Fe-Ni-Al and Fe-Ni-Al-Co systems. Metall Trans A 15, 1819–1828 (1984). https://doi.org/10.1007/BF02664895

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  • DOI: https://doi.org/10.1007/BF02664895

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