Control of Phase Transformation Temperatures by Substituents in Ni-Fe-Ga Ferromagnetic Shape Memory Alloys

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  • Morito Haruhiko
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • Oikawa Katsunari
    Department of Materials Science, Graduate School of Engineering, Tohoku University
  • Fujita Asaya
    Department of Materials Science, Graduate School of Engineering, Tohoku University
  • Fukamichi Kazuaki
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • Ishida Kiyohito
    Department of Materials Science, Graduate School of Engineering, Tohoku University
  • Kainuma Ryosuke
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

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The variations of the martensitic transformation starting temperature TMS and the Curie temperature TC in Ni-Fe-Ga alloys have been investigated by substituting with several kinds of the fourth elements. By partial substitution of Co or Cu for Ni, TC increases and TMS decreases. In particular, the increase of TC is remarkable in the Ni54−xCoxFe19Ga27 alloy, which is related to the strong Ni-Co and Co-Fe exchange interactions. For the Ni54Fe19−xMnxGa27 alloys, TC slightly increases with the increase of Mn content, in analogy with the Ni52FexMn21−xGa27 alloys. From the present study, it is demonstrated that both TC and TMS of the Ni-Fe-Ga alloys can be effectively controlled by selecting the substituents.

収録刊行物

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 48 (11), 2847-2850, 2007

    公益社団法人 日本金属学会

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