Enhanced Field Induced Martensitic Phase Transition and Magnetocaloric Effect in Ni₅₅Mn₂₀Ga₂₅ Metallic Foams

Authors

Carlo Paolo Sasso, Istituto Nazionale di Ricerca Metrologica (INRIM)
Peiqi Zheng, Northwestern University
Vittorio Basso, Istituto Nazionale di Ricerca Metrologica (INRIM)
Peter Müllner, Boise State UniversityFollow
David C. Dunand, Northwestern University

Document Type

Article

Publication Date

7-1-2011

Abstract

The high surface/volume ratio and mechanical stability under cyclic strain makes polycrystalline Ni–Mn–Ga metallic foams attractive for magnetic refrigeration. By means of comparison with a polycrystalline bulk material, we have demonstrated that the porous structure of Ni_54.8Mn_20.2Ga_25.0 open-cells metallic foams (porosity varying between 44% and 58%) reduces the temperature span of the phase transition and increases the magnetocaloric effect (MCE). MCE was investigated using calorimetry in a magnetic field. Temperature scan and isothermal experiments have shown a 0.8 K T⁻¹ shift of the phase transition temperature and a maximum irreversible entropy change of 2.5 Jkg⁻¹ K⁻¹. The results indicate that metallic foams can represent a good approach for enhancing field induced phase transitions in magnetic refrigeration applications.

Publication Information

Sasso, Carlo Paolo; Zheng, Peiqi; Basso, Vittorio; Müllner, Peter; and Dunand, David C.. (2011). "Enhanced Field Induced Martensitic Phase Transition and Magnetocaloric Effect in Ni₅₅Mn₂₀Ga₂₅ Metallic Foams". Intermetallics, 19(7), 952-956. https://doi.org/10.1016/j.intermet.2011.02.015