Performance And Property of Nitinol- A Metal with Memory

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Nitinol It is made of shape memory alloy. This is a special metal alloy that, at a given temperature, can return to its original plastic shape.
Memory alloys have excellent wear resistance and corrosion resistance characteristics, as well as super elasticity, high damping.

What is Nitinol Performance?
As its name implies, nickel-titanium powder is a binary metal powder that consists of both nickel and titanium. The austenite phase, and the martensite phases are different due to changes in temperature or mechanical pressure. The order of phase transformation for nickel-titanium alloys cooling is parent-phase-R-phase-martensite-phase. The R phase has a rhombohedral shape, while the austenite cubes become hard and brittle when temperatures are high or when a load is removed. The shape of the material is relatively stable. The martensite is the state of a material at relatively low temperatures, or under loads. It is hexagonal, ductile and repeatable. It’s also unstable and easily bent.


What are the special properties of Nitinol?
Shape memory: Shape memory occurs when the parent phase (a shape) is cooled to below Mf temperatures from above Af temperatures. This martensite phase is then deformed and heated below Af temperatures, followed by a phase transformation. The material will automatically revert to its parent phase.

Superelasticity: The term superelasticity describes the phenomenon in which a sample is strained beyond its elastic limit strain when subjected to external forces, but the strain automatically returns after the force has been removed.
Sensitivity of orthodontic wires to temperature changes: The orthodontic power and strength of CoCr orthopedic wires is not significantly affected by temperature.

Corrosion resistance According to recent studies, the corrosion resistance between stainless steel wire and nickel-titanium cable is very similar.

Anti-toxicity: Nitinol has a special composition. This is because it is a atomic alloy, like Nitinol. Nickel contains approximately 50% and nickel has been known to promote cancer.

Gentle orthodontic power currently commercially used orthopedic wires include austenitic stainless steel wires, cobalt-chromium-nickel alloy wires, nickel-chromium alloy wires, Australian alloy wires, gold alloy wires and nickel-titanium alloy wires.
Good shock-absorbing characteristics: The greater vibrations of the archwire due to chewing or night molars will cause more damage to the roots and periodontal tissues.

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