| Abstract Scope |
Wire shape materials have ideal design for rapid and cheap production and applications. Moreover, wire shape introduces additional functionality into the shape memory materials group. Typically, wires show high straining in their axial direction. Moreover, shape anisotropy enhances the magnetic field induced straining.
In current contribution we present the latest results on Heusler- based NiFeGa shape memory microwires. In many cases, NiFeGa microwires show monocrystalline structure along entire wire length that is accompanied with shape memory reversible straining up to 16% without necessity of thermal treatment or training. Since it is possible to control the chemical composition very precisely, the transformation temperature can be easily tuned within 100 – 400 K.
Structural transformation is accompanied with a huge variation of initial permeability (over 1000%) that can be used for precise phase detection. Such feature makes NiFeGa microwire ideal material for SMART actuators that can sense their actuation by themselves.
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