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Updated: Dec 3, 2025

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation
Published on: May 2, 2016
Physical Characterization of Sintered NiMnGa Ferromagnetic Shape Memory Alloy
Francesca Villa1, Adelaide Nespoli1, Carlo Fanciulli1
1Consiglio 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.
Abstract:
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.
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