Functional stability of a ferromagnetic polycrystalline Ni2MnGa high temperature shape memory alloy

M.A. Azeem, N.G. Jones, S.L. Raghunathan, V.A. Vorontsov, D. Dye

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Electrocaloric Ni2MnGa is of interest for solid state refrigeration applications, as well as a high temperature thermal shape memory alloy. Here, polycrystalline Ni54Mn25Ga21 is examined using in situ synchrotron X-ray diffraction. The initial martensite (Mf) and austenite (Af) finish temperatures were found to be 232 ° C and 298 ° C respectively. Mf was observed to decline by 8 ° C/cycle and Af increased by 1 ° C/cycle. Both below and surprisingly, above the Curie temperature, the application of an e.m.f. was found to affect the lattice parameters measured. A change in the thermal expansion of the two phases was found around the Curie temperature.

Original languageEnglish
Pages (from-to)274-277
Number of pages4
JournalScripta Materialia
Early online date29 Dec 2016
Publication statusPublished - 15 Mar 2017


  • ferromagnetic shape memory alloy
  • intermetallic compounds
  • synchrotron radiation
  • thermal expansion

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