Experimental Confirmation of Grain Boundary Magnetism in Fe–Si and Fe–Sn Alloys by TEM-EELS

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  • Ii Seiichiro
    Research Center of Structural Materials, National Institute for Materials Science
  • Hirayama Kyosuke
    Department of Materials Science and Engineering, Graduate School of Science and Technology, Kumamoto University
  • Tsurekawa Sadahiro
    Structure Materials, Division of Materials Science and Chemistry, Faculty of Advanced Science and Technology, Kumamoto University

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<p>We measured the local magnetic moments at grain boundaries in Fe–Si and Fe–Sn alloys by electron energy loss spectroscopy with a transmission electron microscope and evaluated the relation between the grain boundary magnetism and grain boundary segregation in Fe–Si and Fe–Sn alloys. We found that the local magnetic moments at the random boundaries in these alloys were remarkably reduced in comparison with those in pure Fe, whereas there was no considerable change at the Σ5 grain boundary and low-angle boundary. The variation of the local magnetic moments at impurity-segregated grain boundaries was explained by the competition between magnetovolume effect and hybridizations of electrons. It was found that the grain boundary character remarkably affects this hybridization. The decrease in the magnetic moments at random grain boundaries was more pronounced in the Fe–Sn alloy than in the Fe–Si alloy.</p>

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 60 (5), 636-641, 2019-03-01

    The Japan Institute of Metals and Materials

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