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Reversible structural transition in monocrystalline Ni2FeGa microwires for shape-memory applicationsFrolova, L.; Ryba, T.; Gamcova, J.; Milkovic, O.; Diko, P.; Kavecansky, V.; Kravcak, J.; Vargova, Z.; Varga, R.
Materials science & engineering. B, Solid-state materials for advanced technology, January 2021, 2021-01-00, 20210101, Letnik: 263Journal Article
•Production of Ni2FeGa Heusler micro-wire with high shape memory effect is reported.•The microwires show 2% reversible strain in the axis of microwire.•The 2% strain is accompanied by a 1600% variation of initial permeability.•Therefore they are ideal material for SMART actuators. We report on the production and characterization of Heusler-based Ni2FeGa microwires exhibiting two – way shape memory effect. The microwires are characterized by a monocrystalline structure with a strong preferred crystallographic orientation that shows 1 1 1 axis parallel to the wire’s axis for high-temperature L21 austenite phase, while the 0 1 7 axis is preferred for low-temperature monoclinic phase. Variation of crystallographic axis (and corresponding easy magnetization axis) leads to 1600% variation of magnetic permeability due to a 2% strain in axial direction. Such straining is reversible immediately after production without the necessity of further thermal treatment. These properties give the microwire function of very sensitive SMART actuators that can be easily produced in a large amount.
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