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Magical Shape Memory Alloy-Nitinol

When it comes to shape memory alloy, many people have heard of its name. No matter how it deforms, after heating to a certain temperature, it can magically change back to its original shape. So far, there are dozens of types of shape memory alloys discovered in the world. Nitinol is one of the earliest developed and most practical alloy materials.
Special properties of Nitinol
Nitinol is a binary alloy composed of nickel and titanium. In addition to its unique shape memory function, it also has a series of excellent properties and is a very good functional material.
1. Shape memory characteristics. Nitinol is deformed by external force at a certain temperature. After the external force is removed, the deformed shape can still be maintained, but it can automatically return to its original shape at a higher temperature.
2. Super elasticity [i]. The superelasticity of nickel-titanium alloy can change with the change of heat treatment conditions. When the nickel-titanium alloy wire is heated above 400℃, the superelasticity begins to decrease.
3. Corrosion resistance. Studies have shown that the corrosion resistance of nickel-titanium alloy is better than the best medical stainless steel, so it is widely used in the medical field.
4. Biocompatibility. Although nickel has carcinogenic effects, the titanium dioxide on the surface of the nickel-titanium alloy acts as a barrier, which can inhibit the release of nickel and make the nickel-titanium alloy have good biocompatibility.
5. Good shock absorption. The initial vibration amplitude of super-elastic Nitinol wire is only half of that of stainless steel wire.


Application of Nitinol

A series of excellent properties of nickel-titanium alloy make it widely used in aerospace, automotive industry, medical equipment and other fields.

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