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Experimental and theoretical studies on phase separations in the Fe-Al-Co ordering alloy system

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Abstract

Phase separations in iron-rich Fe-Al-Co ternary alloys were investigated by means of transmission electron microscopy, differential thermal analysis and magnetization measurement. Two kinds of phase separations have been found at 923 K; A2+B2 and B2+B2*. The former occurs in a tongue-shaped composition region ranging from Fe-12 at % Al-15 at % Co to Fe-35 at % Al-45 at % Co and the latter appears in the small region bordering on the Fe-Al binary side of the A2+B2 field. These two-phase fields have theoretically been evaluated on the basis of the so-called Bragg-Williams-Gorsky model taking account of not only chemical but also magnetic interactions. The magnetic ordering accounts for the expansion of the A2+B2 coexistent region. In the measurement of magnetic properties, large increases in coercive force, H c, and residual magnetic flux density, B r, were observed in the two-phase microstructures.

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Authors and Affiliations

  1. Centre for Cooperative Research, Nagoya Institute of Technology, 466, Nagoya, Japan

    T. Kozakai & T. Miyazaki

  2. Department of Materials Science and Engineering, Nagoya Institute of Technology, 466, Nagoya, Japan

    T. Miyazaki

Authors
  1. T. Kozakai
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  2. T. Miyazaki
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Kozakai, T., Miyazaki, T. Experimental and theoretical studies on phase separations in the Fe-Al-Co ordering alloy system. Journal of Materials Science 29, 652–659 (1994). https://doi.org/10.1007/BF00445974

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  • DOI: https://doi.org/10.1007/BF00445974

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