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

Research output: Contribution to journalArticle

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 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.

Original languageEnglish (US)
Pages (from-to)952-956
Number of pages5
JournalIntermetallics
Volume19
Issue number7
DOIs
StatePublished - 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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