Martensitic and magnetic transformations of the Heusler (, and ) alloys were investigated by differential scanning calorimetry measurement and the vibrating sample magnetometry technique. In all these alloy systems, the austenite phase with the ferromagnetic state was transformed into the martensite phase, which means that these Heusler alloys have potential as -free ferromagnetic shape memory alloys (FSMAs). Furthermore, multiple martensitic transformations, such as two- or three-step martensitic transformations, occur in all these alloy systems. It was confirmed by transmission electron microscopy observation that the crystal structure of the martensite phase is an orthorhombic four-layered structure which has not been reported in other FSMAs. Therefore, the present -free FSMAs have the great possibility of the appearance of a large magnetic-field-induced strain.
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8 November 2004
Research Article|
November 08 2004
Magnetic and martensitic transformations of ferromagnetic shape memory alloys
Y. Sutou;
Y. Sutou
a)
Biomedical Engineering Research Organization, Tohoku University
, 2-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan
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Y. Imano;
Y. Imano
Department of Materials Science, Graduate School of Engineering, Tohoku University
, Aoba-yama 02, Sendai 980-8579, Japan
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N. Koeda;
N. Koeda
Department of Materials Science, Graduate School of Engineering, Tohoku University
, Aoba-yama 02, Sendai 980-8579, Japan
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T. Omori;
T. Omori
Department of Materials Science, Graduate School of Engineering, Tohoku University
, Aoba-yama 02, Sendai 980-8579, Japan
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R. Kainuma;
R. Kainuma
b)
Department of Materials Science, Graduate School of Engineering, Tohoku University
, Aoba-yama 02, Sendai 980-8579, Japan
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K. Ishida;
K. Ishida
b)
Department of Materials Science, Graduate School of Engineering, Tohoku University
, Aoba-yama 02, Sendai 980-8579, Japan
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Appl. Phys. Lett. 85, 4358–4360 (2004)
Article history
Received:
June 01 2004
Accepted:
September 02 2004
Citation
Y. Sutou, Y. Imano, N. Koeda, T. Omori, R. Kainuma, K. Ishida, K. Oikawa; Magnetic and martensitic transformations of ferromagnetic shape memory alloys. Appl. Phys. Lett. 8 November 2004; 85 (19): 4358–4360. https://doi.org/10.1063/1.1808879
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