Effect of Heat-Treatment on the Phases of Ni-Mn-Ga Magnetic Shape Memory Alloys

Pnina Ari-Gur; Giora Kimmel; James W. Richardson; Ashfia Huq; Kapil Sharma

doi:10.4028/www.scientific.net/SSP.152-153.497

Paper Titles

Resistive Transitions in S/F/S Trilayers
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Properties of Vortex States Induced by Proximity Effect in Hybrid Ferromagnet-Superconductor Systems
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Magnetic Properties and Structural Transitions in (MnCo)_1-xGe
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Monte-Carlo Calculation of the Magnetocaloric Effect in Ni-Mn-Ga Alloys
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Effect of Heat-Treatment on the Phases of Ni-Mn-Ga Magnetic Shape Memory Alloys
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Magneto-Optical Effects in Excitonic One-Dimensional Structures
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Second Harmonic Generation in Core (Shell) γ-Fe₂O₃(Au) Nanoparticles
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π Phase Superconductivity and Magnetism in Ferromagnet / Superconductor / Ferromagnet Trilayers
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The Reflectance Spectra of Photonic Crystals with Embedded Ferrite Inclusions
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HomeSolid State PhenomenaSolid State Phenomena Vols. 152-153Effect of Heat-Treatment on the Phases of Ni-Mn-Ga...

Effect of Heat-Treatment on the Phases of Ni-Mn-Ga Magnetic Shape Memory Alloys

Abstract:

The Heusler alloys Ni50Mn25+xGa25-x display magnetic shape memory effect (MSM) with very fast and large reversible strain under magnetic fields. This large strain and the speed of reaction make MSM alloys attractive as smart materials. Our crystallographic investigation of these alloys, focused on non-stoichiometric composition with excess of manganese. Using neutron diffraction, we revealed the necessary processing parameters to achieve and preserve the homogeneous metastable one-phase martensitic structure that is needed for an MSM effect at room temperature.