Memory metal principle memory metal classification

The memory metal is a martensitic transformation alloy with a very regular atomic arrangement and a volume of less than 0.5%. This kind of alloy will deform under external force. When the external force is removed under certain temperature conditions, the original shape can be restored. Because it has more than one million recovery functions, it is called "memory alloy." Next Xiaobian introduced the principles of memory metal and memory metal classification.

Memory Metal Principle

Memory metal has an alias called memory alloy. In the 1970s, alloys with the function of 'memory' shape appeared. And the metal is actually a special metal strip that is easily bent, but it also has the function of restoring the original shape. It is mainly titanium-nickel alloy material, and the principle that the metal utilizes actually is according to the variation law of the object under different temperature, some alloys in the solid state when his crystal structure will have some corresponding changes according to the outside temperature. For example, titanium-nickel alloys have different crystal structures at temperatures above and below 40 degrees Celsius. When the temperature changes up and down at 40 degrees Celsius, the alloy will shrink or expand, and the alloy will change its shape accordingly. Then a reasonable 40 degrees Celsius is a metamorphic temperature of the alloy. Each alloy has its own metamorphic temperature, and some alloys have high metamorphic temperatures.

Memory Metal Classification

One-way memory effect

The shape memory alloy is deformed at a lower temperature, and the shape before deformation can be restored after heating. This shape memory phenomenon existing only in the heating process is called a one-way memory effect.

2. Two-way memory effect

Some alloys recover the shape of the high-temperature phase when heated, and can recover the shape of the low-temperature phase when cooled, known as the two-way memory effect.

3, full memory effect

When heated, the shape of the high-temperature phase is restored, and when it cools, it becomes the shape of the low-temperature phase with the same shape and opposite orientation, which is called the full-memory effect.

Memory Metal Industry Applications

1. One-way shape recovery using one-way shape memory effect. Such as pipe joints, antennas, collars and so on.

2. Recovery of extrinsic two-way memory. That is, the use of one-way shape memory effect and the use of external force with the temperature rise and fall to do repeated actions, such as thermal components, robots, terminals and so on.

3, internal two-way memory recovery. That is, using the two-way memory effect to make repeated movements with the temperature rise and fall, such as heat engine, thermal components and so on. However, such applications have a fast memory decay and poor reliability and are not commonly used.

4, the application of super elasticity. Such as springs, binding posts, glasses frames and so on.

Editor's summary: The memory metal principle and memory metal classification are introduced here, and I hope to be helpful to everyone. If you want to know more related information, you can pay attention to this website information.

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