Abstract
Temperature dependence of the equilibrium transformation field (H0) for Ni50Mn34.4In15.6 metamagnetic shape memory alloy was precisely determined by electrical resistivity measurements using a pulsed magnet. The H0-T curve was found to exhibit a maximum at around 50K, suggesting that the transformation entropy change becomes negative in the lower temperature region. The residual electrical resistivity in the field-induced parent phase at lower temperatures was about 10 © 10 ¹8 ³·m, being normal value as the ferromagnetic alloys, whereas that in the martensite phase was high of about 200 © 10 ¹8 ³·m. The temperature dependence of the magnetic field hysteresis can be well fitted with the Seeger’s theory proposed for plastic deformation by dislocations. [doi:10.2320/matertrans.M2012365]
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