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Physical Characterization of Sintered NiMnGa Ferromagnetic Shape Memory Alloy

Consiglio Nazionale delle Ricerche—Istituto di Chimica della Materia Condensata e di Tecnologie per l’Energia (CNR-ICMATE Sede di Lecco), via G. Previati 1/e, 23900 Lecco, Italy
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Materials 2020, 13(21), 4806; https://doi.org/10.3390/ma13214806
Received: 9 October 2020 / Revised: 21 October 2020 / Accepted: 25 October 2020 / Published: 28 October 2020
The present work focused on the microstructural, thermal, electrical, and damping characterization of NiMnGa samples produced through a powder pressing and a sintering process; the effect of sintering times and of the starting powder size were evaluated. Moreover, an observation of the evolution of martensitic transformation typical of NiMnGa ferromagnetic shape memory alloy was conducted in comparison with the cast material behavior and in correlation with the material densification. The optimum powder size and sintering time for the process, i.e., 50 µm or lower and 72 h, were identified considering the investigated physical properties of the sintered samples in comparison to the cast material. The corresponding sample showed the best compromise between density, thermal and electrical properties, and damping and functional behaviour. In general, the outcomes of this study could be the basis of a useful tool for production processes that include a sintering step as well as being a starting point for the evaluation of an alternative low cost fabrication method of this alloy. View Full-Text
Keywords: ferromagnetic shape memory alloys; sintering; martensitic transformation; thermal properties; internal friction; electrical properties ferromagnetic shape memory alloys; sintering; martensitic transformation; thermal properties; internal friction; electrical properties
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MDPI and ACS Style

Villa, F.; Nespoli, A.; Fanciulli, C.; Passaretti, F.; Villa, E. Physical Characterization of Sintered NiMnGa Ferromagnetic Shape Memory Alloy. Materials 2020, 13, 4806. https://doi.org/10.3390/ma13214806

AMA Style

Villa F, Nespoli A, Fanciulli C, Passaretti F, Villa E. Physical Characterization of Sintered NiMnGa Ferromagnetic Shape Memory Alloy. Materials. 2020; 13(21):4806. https://doi.org/10.3390/ma13214806

Chicago/Turabian Style

Villa, Francesca, Adelaide Nespoli, Carlo Fanciulli, Francesca Passaretti, and Elena Villa. 2020. "Physical Characterization of Sintered NiMnGa Ferromagnetic Shape Memory Alloy" Materials 13, no. 21: 4806. https://doi.org/10.3390/ma13214806

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