Martensitic transformation behavior under magnetic field in Co-Ni-Al ferromagnetic shape memory alloys

Y. Sutou, R. Kainuma, K. Ishida, M. Taya

Research output: Contribution to journalConference articlepeer-review

9 Citations (Scopus)


Effect of the magnetic field on the martensitic transformation of Co-Ni-Al single-crystal was investigated by differential thermal analysis (DTA) and the in-situ microstructure observation under magnetic field. The martensitic transformation temperatures Ms and Mf of the Co 34.5Ni35.5Al30 (at.%) single-crystal specimen showing the martensitic transformation from the paramagnetic austenite (B2) to the ferromagnetic martensite (L10) slightly increased under the magnetic field and those temperatures shifts were about 1.3 °C at 1.0 T. It was also observed in the Co34.5Ni35.5Al30 single-crystal specimen that the phase boundaries between the austenite and the martensite slightly move by applying the magnetic field of 1.0 T. These results are discussed on the basis of a thermodynamic stability of the martensite phase under the magnetic field. The martensitic and the magnetic transformation behaviors of the Ni-Al-Co alloys are also reviewed.

Original languageEnglish
Pages (from-to)159-168
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2003
EventPROCEEDINGS OF SPIE SPIE - The International Society for Optical Engineering: Smart Structures and Materials 2003 Active Materials: Behavior and Mechanics - San Diego, CA, United States
Duration: 2003 Mar 32003 Mar 6


  • Co-Ni-Al
  • Ferromagnetic shape memory alloys
  • Magnetic field-induced martencitic transformation
  • Martensitic transformation


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