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Magnetostructural phase transformation and shape memory effect of Fe-added Ni2MnGa films

  • M. OhtsukaEmail author
  • J. Sekino
  • K. Koyama
  • T. Takagi
  • K. Itagaki
Article

Abstract.

The magnetostructural phase transformation and shape memory effect (SME) of Fe-added Ni2MnGa films were investigated. The free-standing films were heat-treated at 1073 K for 3.6 ks and constraint-aged (CA) at various conditions (473 ~ 723 K, 0 ~ 14.4 ks) to make the two-way SME. The reversible two-way SME by the temperature change was confirmed through the martensitic transformation (MT) and its reversion. The gradient of strain-temperature curve, the effective recovery strain and the width of thermal hysteresis were dependent on the CA conditions. The magnetic field (MF) induced structural phase transformation was evaluated by an XRD apparatus in high MF up to 5 T. It was confirmed that the martensitic phase was stabilized by the MF. Furthermore, the SME by the MF was observed around MT temperature on cooling process for the CA film. It was concluded that the MF induced SME appeared by the induction of the MT with MF.

Keywords

Magnetic Field Martensitic Transformation Shape Memory Alloy European Physical Journal Special Topic Cool Process 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2008

Authors and Affiliations

  • M. Ohtsuka
    • 1
    Email author
  • J. Sekino
    • 2
  • K. Koyama
    • 3
  • T. Takagi
    • 4
  • K. Itagaki
    • 5
  1. 1.Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku UniversitySendaiJapan
  2. 2.Graduate Student, Tohoku UniversitySendaiJapan
  3. 3.Institute for Materials Research (IMR), Tohoku UniversitySendaiJapan
  4. 4.Institute of Fluid Science (IFS), Tohoku UniversitySendaiJapan
  5. 5.Professor Emeritus, Tohoku UniversitySendaiJapan

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