Abstract
Ni50Mn29Ga21−xTbx (0⩽x⩽1) alloys were studied with the microstructure, phase transition, and magnetocaloric effect. Dual-phase microstructure containing the martensite matrix and Tb-rich precipitations were formed. The martensitic transformation was observed over the whole composition range, with the transformation temperature TM significantly increased by the addition of terbium. The magnetic transition temperatures of the austenite and martensite, i.e. TCA and TCM, were monitored for 0⩽x⩽0.16 and 0.27⩽x⩽1, respectively. Both TCA and TCM were slightly decreased by the addition of terbium. For 0.16⩽x⩽0.27 the martensitic transformation was coincided with the magnetic transition in case of TM=TC, giving rise to the coupled magneto-structural transition from ferromagnetic martensite to paramagnetic austenite. Sizable magnetic entropy change was induced by magnetic field in the vicinity of the coupled magneto-structural transition.
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