Enhanced field induced martensitic phase transition and magnetocaloric effect in Ni55Mn20Ga25 metallic foams

Carlo Paolo Sasso; Peiqi Zheng; Vittorio Basso; Peter Müllner; David C Dunand

doi:10.1016/j.intermet.2011.02.015

Enhanced field induced martensitic phase transition and magnetocaloric effect in Ni₅₅Mn₂₀Ga₂₅ metallic foams

Carlo Paolo Sasso, Peiqi Zheng, Vittorio Basso, Peter Müllner, David C Dunand

Materials Science and Engineering

Research output: Contribution to journal › Article

18 Scopus citations

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.

Original language	English (US)
Pages (from-to)	952-956
Number of pages	5
Journal	Intermetallics
Volume	19
Issue number	7
DOIs	https://doi.org/10.1016/j.intermet.2011.02.015
State	Published - Jul 1 2011

Keywords

A. Magnetic intermetallics
B. Magnetic properties
B. Martensitic transformations
F. Calorimetry

ASJC Scopus subject areas

Chemistry(all)
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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title = "Enhanced field induced martensitic phase transition and magnetocaloric effect in Ni55Mn20Ga25 metallic foams",

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 Ni54.8Mn 20.2Ga25.0 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.",

keywords = "A. Magnetic intermetallics, B. Magnetic properties, B. Martensitic transformations, F. Calorimetry",

author = "Sasso, {Carlo Paolo} and Peiqi Zheng and Vittorio Basso and Peter M{\"u}llner and Dunand, {David C}",

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T1 - Enhanced field induced martensitic phase transition and magnetocaloric effect in Ni55Mn20Ga25 metallic foams

AU - Sasso, Carlo Paolo

AU - Zheng, Peiqi

AU - Basso, Vittorio

AU - Müllner, Peter

AU - Dunand, David C

PY - 2011/7/1

Y1 - 2011/7/1

N2 - 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 Ni54.8Mn 20.2Ga25.0 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.

AB - 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 Ni54.8Mn 20.2Ga25.0 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.

KW - A. Magnetic intermetallics

KW - B. Magnetic properties

KW - B. Martensitic transformations

KW - F. Calorimetry

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