Lamellar Type Microstructure in the Grain Boundary of Fe-Ni-Mn Ternary Alloys

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  • Sato Shigeo
    Department of Mechanical Engineering, Nippon Institute of Technology
  • Urushihara Fujio
    Department of Mechanical Engineering, Nippon Institute of Technology
  • Suzuki Tomoo
    Department of Metallurgical Engineering, Faculty of Engineering, Tokyo Institute of Technology

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  • Fe-Ni-Mn 3元系合金におけるラメラー状の粒界反応組織
  • Fe Ni Mn 3ゲンケイ ゴウキン ニ オケル ラメラージョウ ノ リュウ

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Discontinuous precipitation of Fe-Ni-Mn ternary alloys containing 40 to 90 at%Fe were investigated by means of optical and electron microscopy, X-ray diffraction, dilatation, electrical resistivity and hardness measurements. During aging at 673 K, in the alloys containing 50 to 90%Fe, precipitates are hardly observed in the matrix and the primary cell with lamellar structure grows discontinuously from the grain boundary. However, with decreasing Fe content, the primary cell is changed from lamellar-type to the modulated-type. The primary and the secondary cells with lamellar structure precipitating in the temperature range i.e., 673∼748 K, consist of a bcc phase and an fct phase. The bcc phase is directly formed at the aging temperature. At the temperatures above 773 K, the lamellar cell consists of an fcc phase and an fct phase.

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