Shape memory alloy is a martensitic phase change alloy with a very regular atomic arrangement and a volume that changes to less than 0.5%. It is also what we often call nitinol shape memory alloy. This alloy will deform under the action of external force. When the external force is removed, it can return to its original shape. This reflects the superelasticity of nitinol shape memory alloy. When under certain temperature conditions, it can restore its original shape, which reflects the shape memory effect of nitinol shape memory alloy.
Classification of shape memory alloys
1.)One-way memory effect: Shape memory alloys deform at lower temperatures and can restore their shape before deformation after heating. This shape memory phenomenon that only exists during the heating process is called the one-way memory effect.
2.)Two-way memory effect: Nitinol alloy restores the high-temperature phase shape when heated, and can restore the low-temperature phase shape when cooled, which is called the two-way memory effect.
3.)Full-range memory effect: When heated, the high-temperature phase shape is restored, and when cooled, it changes to a low-temperature phase shape with the same shape but opposite orientation, which is called the full-range memory effect.
Classification of shape memory alloys
1.) Nitinol Metal has a shape memory effect. Take a spring made of memory alloy as an example. If you put this kind of spring in hot water, the length of the spring will immediately extend, and then put it in cold water, it will immediately return to its original shape.
2.) Shape memory alloy has superelasticity, which is manifested in that under the action of external force, nitinol shape memory alloy has a much greater deformation recovery ability than ordinary metals, that is, the large strain generated during the loading process will recover with unloading.
3.) Magnetic shape memory alloys have bidirectional strain effects, and these unique properties are very suitable for the development of new actuators.
4.) Nitinol memory metal compare with giant magnetostrictive materials, the price of nitinol shape memory alloy materials is lower. Since giant magnetostrictive materials contain a large amount of expensive metal (Tb), the price of magnetic shape memory alloys is about one-tenth of that of giant magnetostrictive materials.
5.) Nitinol Shape Memory alloys have many important applications. Magnetic shape memory alloys, as smart materials, are the material basis for future national defense and high-tech fields. Its high strain characteristics and high response frequency are expected to be used in sensors, surface intelligent structures, automatic control, aircraft wing control systems and ultra-high-power ultrasonic transducer technology.
In short, shape memory alloy has many new materials and new effects that are worthy of our utilization and research. For example, there is a new mechanism of the important role of magnetic field on the martensitic phase transformation of shape memory alloys. In principle, the magnetically induced shape memory effect is completely different from the currently commonly used magnetostrictive effect and from the existing shape memory alloys and piezoelectric materials controlled by temperature. Therefore, many new materials and new application fields can be developed. Medical biocompatibility. If you are interested in nitinol memory alloy and want to know more about it, you can contact amybai2010@zwmet.com at any time. As a smart material, magnetic shape memory alloy is the material basis for future national defense and high-tech fields. Its high strain characteristics and high response frequency are expected to be used in sensors, surface intelligent structures, automatic control, aircraft wing control systems and ultra-high-power ultrasonic transducer technology.
