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Martensitic Transformation in Co-Based Ferromagnetic Shape Memory Alloy

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Kopeček J., Yokaichiya F., Laufek F., Jarošová M., Jurek K., Drahokoupil J., Sedláková-Ignácová S., Molnár P., Heczko O.

Acta Physica Polonica A

2012

vol. 122

issue 3

475-477

The Co_{38}Ni_{33}Al_{29} alloy in both powder and bulk state was investigated in the presented study using neutron diffraction on E9 high resolution powder diffractometer at HZB (BER II). The reverse martensitic phase transformation from the tetragonal martensitic phase into the cubic austenitic phase was observed with the phase coexistence within the temperatures from 183 K to 133 K. The fcc cobalt solid solution particles distributed in the transforming matrix remained in the same state through the whole temperature range. The obtained results agree with magnetization measurements on the same annealed sample. The powder data are compared with experiments on bulk sample, although there was a texture present. The obtained results provide further information about the phase transition process in this important class of ferromagnetic shape memory alloys.

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1 Acta Physica Polonica A

1 2012

1 Drahokoupil J.

1 Heczko O.

1 Jarošová M.

1 Jurek K.

1 Kopeček J.

1 Laufek F.

1 Molnár P.

1 Sedláková-Ignácová S.

1 Yokaichiya F.

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Martensitic Transformation in Co-Based Ferromagnetic Shape Memory Alloy