Abstract
We have studied the phase transformation behavior of melt-spun ribbons with x = 0, 1, 2, …, 7 (at%). It is shown that Cu substitution simultaneously increases and decreases the martensitic transformation temperature TM and the magnetic transition temperature of austenite , respectively. In Ni50Mn18Ga25Cu7 ribbons, the magnetic and structural transformations are coupled. The field-induced martensitic transformation from a paramagnetic austenite with lower magnetization to a ferromagnetic martensite with higher magnetization has been studied. The critical field μoHcr above which the magnetic field can induce the martensitic transition is well defined and decreases linearly with the decrease of the temperature at a reduction rate of 1 T K−1. Under a magnetic field of 5 T, the starting temperature of martensitic transformation (Ms) increases by ~9 K. Such a magnetic field-induced transformation is irreversible and temperature dependent, giving rise to the maximum magnetic entropy change of 17.8 J kg−1 K−1 and hysteresis losses of 43.6 J kg−1 under the magnetic field change of 5 T, respectively.
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