Ni-Ti shape memory alloys are extremely interesting materials both for their ability of showing the shape memory effect (SME) and for their elevated strength and ductility.
The reason why only some metals show the shape memory effect is because of a reversible change in their crystal structure. SMAs have two different phases with different crystal structures and so different properties, a high temperature phase called martensite and a low temperature phase called austenite. Contrary to a typical transformation that involves the diffusion of atoms, the phase change in SMAs occurs by a shear lattice distortion, which makes the change reversible.
NiTinol offers additional advantage for the targeted application since there is a good understanding of its thermomechanical response and the crystallography, as well as of the effects of changes of the transformation temperatures and the heat treatment with variations in composition.
Ni-Ti shape memory alloys are extremely interesting materials both for their ability of showing the shape memory effect (SME) and for their elevated strength and ductility.
SMAs have been used in a wide variety of applications spanning diverse industries. Apart from the flexible spectacle frames mentioned above, they can be used in bioengineering applications such as dental wires such as those used in dental braces, mending broken bones using metal plates, and for medical devices that help open clogged veins and arteries. They are used as wires and tubes in applications with hot fluids flowing through them. These materials are ideal as they can retain their shape even in a heated environment.
Another application of SMAs is in civil engineering. For example, they have been used in bridge structures. SMAs can dampen vibrations, hence tuning the natural frequency of various structures. This property of vibration damping has also been used in launch vehicles and jet engines. Newer lightweight alloys have also been discovered, such as magnesium-scandium that can have a variety of potential applications such as in aerospace applications and the medical industry for biodegradable self-expanding stents.
SMAs can be also used as actuators because of their ability to change shapes and have potential applications in aircraft and space vehicles because they are lighter and can help save energy compared to bulky mechanical actuators. Earlier this year, NASA demonstrated a nickel-titanium SMA actuator used in folding the outer portions of wings during flight. This change in the angle of the plane's wings according to wind and turbulence helps reduce energy use.
Shape memory alloy wire Specifications :
Name : shape memory alloy wire
Ti : 44% to 45%
Strength : 750-960Mpa ( Adjust as customers requirements )
Processing Service:Cutting
Dimension: Diameter 0.1- 90mm
Yield Strength(Austenite): 560MPa
Surface State:Black oxide surface, medical grade polished surface
Tolerance:Customer specified / industry standards
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