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

doi:10.1016/j.scriptamat.2016.12.012

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

^*Corresponding author for this work

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Abstract

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 (M_f) and austenite (A_f) finish temperatures were found to be 232 ° C and 298 ° C respectively. M_f was observed to decline by 8 ° C/cycle and A_f 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 language	English
Pages (from-to)	274-277
Number of pages	4
Journal	Scripta Materialia
Volume	130
Early online date	29 Dec 2016
DOIs	https://doi.org/10.1016/j.scriptamat.2016.12.012
Publication status	Published - 15 Mar 2017

Keywords

Ferromagnetic shape memory alloy
Intermetallic compounds
Synchrotron radiation
Thermal expansion

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10.1016/j.scriptamat.2016.12.012

MA-Ni2MnGa-Scripta-authorVersionAccepted author manuscript, 1.42 MB

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title = "Functional stability of a ferromagnetic polycrystalline Ni2MnGa high temperature shape memory alloy",

abstract = "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.",

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T1 - Functional stability of a ferromagnetic polycrystalline Ni2MnGa high temperature shape memory alloy

AU - Azeem, M. A.

AU - Jones, N. G.

AU - Raghunathan, S. L.

AU - Vorontsov, V. A.

AU - Dye, D.

PY - 2017/3/15

Y1 - 2017/3/15

N2 - 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.

AB - 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.

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KW - Intermetallic compounds

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

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