Phase transformation and magnetic properties of ferromagnetic Cu-Mn-Ga alloys

Takuro Kushima, Koichi Tsuchiya, Yasukazu Murakami, Daisuke Shindo, Yoshikazu Todaka, Minoru Umemoto

    Research output: Contribution to journalArticlepeer-review

    2 Citations (Scopus)

    Abstract

    Phase transformation, microstructure and magnetic properties of Cu-(11-14)mol%Mn-20 mol%Ga alloy were investigated. Magnetic domain structures were also investigated by the Lorentz microscopy and electron holography. Plate-like martensite phase (ζ M. ordered hep) was observed in as-quenched Cu-12 mol%Mn-20 mol%Ga. Phase transformation from ζ M martensite to ζ phase (hcp) occurred at around 540 K on heating. The ζ phase decomposed into β (ordered hcp) and β(bcc) phase at around 700 K, then became the single β phase at around 840 K. By subsequent slow cooling, ζ phase was observed at room temperature. Results of the Lorentz microscopy and electron holography revealed that the twin plates of CM martensite and magnetic domains have one-to-one correspondence, suggesting high magneto-crystalline anisotropy energy of the martensite phase. Saturation magnetization and Curie temperature increased with Mn content.

    Original languageEnglish
    Pages (from-to)849-855
    Number of pages7
    JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
    Volume70
    Issue number10
    DOIs
    Publication statusPublished - 2006 Oct

    Keywords

    • Ferromagnetic shape memory alloy
    • Magnetic domain
    • Martensitic transformation
    • Twin

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Mechanics of Materials
    • Metals and Alloys
    • Materials Chemistry

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