Abstract
The transformation behaviors on metamagnetic shape memory Ni46.4Mn38.8In12.8Co2.0 film were investigated by X-ray diffraction experiments in the temperature up to 473 K and magnetic fields µ0H up to 5 T. The prepared film showed the parent phase with L21 structure at 473 K, and with preferred orientation along the 111 plane. The magnetic field induced reverse transformation was directly observed at T = 366 K, which was just around the reverse transformation starting temperature.
Highlights
Ferromagnetic shape memory alloys (FSMAs) have been studied actively as high-performance actuator materials since a large magnetic field-induced strain of 0.2% was found in Ni2 MnGa alloys by Ullakko et al [1]
In 2004, Sutou et al found that Ni-Mn-X (X = In, Sn, and Sb) alloys with Heusler-type structure showed a martensitic transformation with magnetic transition [5]
Microstructure, and martensitic transformation behaviors were evaluated for MSM films and ribbons, the martensitic transformation induced by magnetic fields has not yet been confirmed by using in-situ observation techniques
Summary
Ferromagnetic shape memory alloys (FSMAs) have been studied actively as high-performance actuator materials since a large magnetic field-induced strain of 0.2% was found in Ni2 MnGa alloys by Ullakko et al [1]. According to Reference [16], the annealing temperature changes the crystal structure of M-phases. The transformation behaviors and crystal structures of MSM films were sensitive to slight composition change and the annealing conditions. Microstructure, and martensitic transformation behaviors were evaluated for MSM films and ribbons, the martensitic transformation induced by magnetic fields has not yet been confirmed by using in-situ observation techniques. Magnetic field-induced reverse transformations in Ni40 Co10 Mn34 Al16 MSM alloys were observed at 408 K using this apparatus [26]. Co-doped Ni-Mn-In film, high field X-ray diffraction experiments were performed under magnetic fields up to 5 T and temperature ranging from 293 to 473 K
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