How does memory metal fix its initial shape thank you 50

Shape memory alloy product varieties and specifications.

Name: Grade: Phase Change Temperature, Type, Specification(mm), Standard, Application.

Memory-type titanium-nickel.

Alloy TINI-01 20OC-40OC wire Q XB1516 Stress bars, thermal drive springs, temperature control elements, etc.

Tini-01 45OC-90OC Stick

Super elastic Titanium-Nickel Alloy Tini-SS 5OC-15OC filament Q XB1516 Communication antenna, glasses frame, bra.

brackets, etc. Stick

Plate δ q xb1516

Low temperature superelastic titanium-nickel alloy TN3 <5OC filament Q XB1516 communication antennas, glasses frames, bra holders, etc.

Rods Low temperature superelastic titanium-nickel alloy TNC <-15OC filament Q XB1516 communication antennas, glasses frames, bra holders, etc.

Rod Medical Titanium-Nickel Alloy Tini-YY 33OC 3OC Wire Q XB1520 Bone Plates, Riding Seam Nails, Braided Mesh Stents, Orthodontic Wires, Medical Guide Wires, etc.

Bars, plates, δ narrow hysteresis, titanium-nickel alloys, tinicu AS-MS 5OC wires, temperature control components, etc.

Bars, wide lag titanium-nickel alloys, tininb AS-MS<150OC wires, pipe joints, fastening rings, etc.

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You try to change the shape of the temperature at which you change back to its original shape.

In the ranks of new metal materials, in addition to titanium metal, which is regarded as the backbone of the new century, there are many roles with special functions, and shape memory alloy is one that has attracted much attention.

The objects we see with the naked eye are made up of countless tiny particles called atoms, which are hundreds of thousands of times smaller than dust. For example, metal crystals are composed of metal atoms according to a certain arrangement, and the arrangement of some alloy atoms will change with different environmental conditions. For example, one arrangement at a higher temperature is one arrangement, and when the temperature drops to a certain critical temperature, another arrangement.

When heated above the critical temperature again, the arrangement of the atoms automatically returns to the way they were at the original high temperature. If you use physical education class as an analogy, the assembly password shouted by the teacher is the critical temperature, and the students are atoms one by one, and as soon as the teacher shouts the password, everyone will line up in a certain formation. The temperature change is like ringing the class bell, and everyone disbands, but the next time the teacher shouts the password, everyone will line up in the same formation as last time.

This is the case with the memory function of alloys. Different alloys have different critical temperatures.

Memory alloy pipes.

Originally, when heated, the shape memory alloy whose internal structure changed to a diamond-shaped lattice due to the action of external force was transformed back into the state of the square lattice before the forceThus the original shape is restored. For example, nitinol, one of the shape memory alloys, has a different crystal structure above and below a temperature of 40 t. At 40t, nitinol will undergo transformation, so 40t is its transition temperature, also called "memory temperature".

Above the transition temperature, the crystal structure is in a stable state, while below the transition temperature, the crystal structure is unstable. If people change its shape below the transition temperatureThen, when it is heated above the transition temperature, the crystal structure in the unstable state will immediately return to the stable state, and its shape will return to the original state accordingly. That's why nitinol remembers shapes.

Memory alloys not only restore to their original state, but can be repeated millions of times without the slightest fatigue and breakage. Nitinol has a tensile strength of up to 1000 megapascals. That is to say, it takes more than 1,000 Newtons of force to be added to a section as small as 1 square millimeter to pull the nitinol apart.

The strange ability of memory alloys has attracted the attention of humans.

Starting from nitinol, mankind has developed a variety of series of memory alloys such as nitinol, iron alloys and copper alloys. They are widely used in industrial production, aerospace, electronic appliances, medical and other aspects, and have helped people solve many problems. The first application of SMAs was in the early 60s of the 20th century.

Nitinol shape memory alloys were first used in the pipe joints of hydraulic systems of US Navy aircraft, and the results were very successful.

At that time, 1 3 of the US Navy flight accidents were caused by leaks in the pipe joints of the aircraft's hydraulic system. The aircraft used ordinary joints at firstDue to thermal expansion and contraction, some pipe joints inevitably leak. After adopting the memory alloy sleeve joint technology, the hydraulic system of an F-14 fighter used more than 800 memory alloy sleeve joints, and there was not a single leakage of pipe joints, which was undoubtedly a miracle at that time.

Since then, the United States has popularized the use of memory alloy sleeve joints in the hydraulic systems of various aircraft, and by the early 90s of the 20th century, more than 1 million pieces have been used without a single accident.

Memory metal is subject to changes in external conditions, such as temperature, etc., otherwise why would it be called memory metal, wouldn't it be in vain? will revert to the original situation.

Two-way memory effect Some alloys recover the shape of the high-temperature phase when heated and the low-temperature phase shape when cooled, which is called the two-way memory effect.

Memory metal will revert to its original state when external conditions change, such as temperature.

In 1961, a research team at the U.S. Naval Research Institute straightened a batch of twisted nitinol wires one by one. But when the wire is close to the fire, the straight wire all returns to its original curved shape. After repeated experiments, it has been proved that nitinol increases at temperature.

Because memory metal will return to its original condition after high temperatures.

That's for sure, otherwise why would it be called memory metal, wouldn't it be in vain?

Otherwise, why would it be called memory metal, wouldn't it be in vain?