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  • Shape memory alloy

    Deshraj Meena and Shovan Bhaumik

    Shape memory alloy has a unique ability to recover their initial shape after deformation through a reversible thermo-elastic phase transformation. Shape memory alloy are also called smart material have property of producing strain by an external condition such as temperature, light, pressure or electricity.

    A Shape Memory Alloy (SMA) is able to memorize and recover its original shape, after it has been deformed by heating over. This unique effect of returning to original geometry after a large inelastic deformation is known as the Shape memory effect.

    Ti-rich NiTi compounds show characteristic transformation temperatures higher than the room one and they can recover high Shape Memory Effect (SME). They are widely used in shape memory alloy application. Shape memory alloy have very good electrical and mechanical properties, high corrosion resistance and bio-compatibility. When an electric current is injected in the shape memory alloy element, it can generate enough heat to cause the phase transformation due to joule effect.

    This unique behavior of shape memory alloys have become a valuable industrial choice in the engineering world. Pseudo-plasticity, superelasticity, and shape memory effect are increasingly used in many applications including actuators.

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