Abstract
The Magnetocaloric Effect (MCE) of directionally solidified Ni50Mn18Cu7Ga25 alloy was improved based on texturation and introduction of extra phase transition in this paper. Magneto-structural transition is realized in directionally solidified Ni50Mn18Cu7Ga25 alloy, with a value of Adiabatic Temperature Variation (ΔTad) of − 1.35 K under magnetic field of 1.5 T. Through simple unidirectional compression, preferred orientation is formed and intermartensitic transformation is introduced in the present alloy. Preferred orientation strengthens the coupling of magnetic and structural transition, intermartensitic transformation makes transformation path more diverse, which both enhance ΔTad of the directionally solidified alloy. A value of ΔTad of − 2.34 K is obtained in the deformed alloy under magnetic field of 1.5 T, with a 73.3 % increase compared with the initial state. Moreover, the two incompletely overlapping structural transitions broadens the temperature range of MCE from 4.3 K to 7 K. The present work provides new insight on the MCE optimization of Ni-Mn-Ga alloy by simple and short-term unidirectional compression in view of merging different strengthening mechanisms.
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