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Introduction to memory alloy

Introduction to memory alloy

Introduction to memory alloy

(Summary description)Shape memory alloy (SMA) has been widely used in clinical medical fields, such as artificial bones, bone fixation and compression devices, orthodontic devices, various endoluminal stents, embolization devices, cardiac repair, thrombus filters, interventional guidance and surgery Suture, etc. SMA plays an irreplaceable role in modern medicine. Memory alloys are also closely related to our daily lives.

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Shape memory alloy (SMA) has been widely used in clinical medical fields, such as artificial bones, bone fixation and compression devices, orthodontic devices, various endoluminal stents, embolization devices, cardiac repair, thrombus filters, interventional guidance and surgery Suture, etc. SMA plays an irreplaceable role in modern medicine. Memory alloys are also closely related to our daily lives.

形状 Shape memory effect exists in shape memory alloy. Take shape memory alloy springs as an example. When the spring is placed in hot water, the length of the spring is immediately extended, and then placed in cold water, the spring will immediately return to its original state. Shape memory alloy spring can be used to control the water temperature of the bathroom water pipe: When the hot water temperature is too high, you can adjust or close the water pipe to avoid burns through the "memory" function. It can also be made into fire alarm device and electrical equipment safety device. When a fire occurs, the spring made of memory alloy is deformed and the fire alarm device is activated to achieve the alarm purpose. A spring made of memory alloy can also be placed in the heating valve to maintain the temperature of the heating chamber. When the temperature is too low or too high, the heating valve can be opened or closed automatically. The shape memory effect of shape memory alloys is also widely used in temperature sensor triggers.

Another important characteristic of shape memory alloys is pseudo-elasticity (also known as superelasticity), which indicates that under the action of external forces, shape memory alloys have greater deformation recovery ability than ordinary metals, that is, the large strain generated during loading is more than ordinary Metal has greater ability to recover from deformation. OCESS will be restored by uninstalling. This performance has been widely used in medicine, building shock absorption and daily life. Such as artificial bones, traumatic bone fixation compressors, orthodontics. Spectacle frames made of shape memory alloy can withstand greater deformation without damage than ordinary materials (not by applying the shape memory effect and recovering after deformation).

In the 1970s, an alloy with a "memory" shape function appeared in world materials science. Memory alloy is a special kind of metal strip. It bends easily. We put it in a glass jar filled with hot water, and the metal bar rushed forward. Put the metal bar in cold water to restore it to its original state. In a glass jar filled with cold water, stretch a spring and place it in hot water. The spring closes again automatically. In cold water, the spring returns to its original shape, while in hot water, the spring shrinks. The spring can stretch and contract indefinitely and then be broken. These are made of memory smart metal. Its microstructure has two relatively stable states. At high temperatures, this alloy can change into any shape you want. At lower temperatures, the alloy can be stretched. But if reheated, it will remember the original shape and then change back to the original shape.

This material is called memory metal. Mainly nickel-titanium alloy materials. For example, the superalloy after high temperature annealing is spiral.

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