Nitinol Foil, (NITI Foil) Shape Memory Alloy (SMA) Foil, Shape Memory NiTi Alloy Foil - Superelastic NiTi Alloy Foil, Nitinol Strip

Nitinol Strip

Nitinol foil can be used for either its movement characteristics, chemical resistance, puncture resistance, or other needs where the features of nitinol are needed in a foil.Nitinol foil are the fabricating product of nickel-titanium alloy. Nitinol is well known for its thermo-mechanical properties of superelasticity and shape memory effect. Shape memory refers to the ability of Nitinol to undergo deformation at one temperature and then recover its original, under formed shape upon heating above its transformation temperature. Super elasticity occurs at a narrow temperature range just above its transformation temperature; in this case, no heating is necessary to cause the under formed shape to recover, and the material exhibits enormous elasticity, some 10-30 times that of ordinary metal. Nitinol is a nickel-titanium alloy with the typical ratio 40-50% nickel, 50-60% titanium known as a shape memory alloy (SMA), a metal alloy that demonstrates pseudo-elasticity and the shape memory effect. The shape memory effect is when a material returns to its pre-deformed shape by heating. These unusual properties are being applied to a wide assortment of applications in a number of different fields including the medical device and aerospace industries.

Nitinol Synonyms

Nickel Titanium, shape memory Nitinol, Muscle Wire, Tinel, NiTi, Ni-Ti, nickel-titanium shape-memory alloy (SMA), Alloy N, Alloy M

Nitinol Strip Specification

Dimensions

Foil Size：Minimum thickness: 0.002”, customized

Strip Size：Minimum thickness: 0.01”

Maximum thickness: 0.04”

Minimum width: 0.024”

Maximum width: 0.2”

Standard：ASTM F2063

AF:-10 ºC(Superelastic)-100 ºC, customized

Surface Finish：Cold rolling surface

NiTi

Per your request or drawing

We can customized as required

The foil is very strong and puncture resistant. It will return to original / trained shape when heated to approx. 50ºC or above. Heating past 100ºC is not recommended or necessary unless you are setting a new shape.

some advice:

"The foil is quite different from wire, and your expectations should not be the same. The foil will crease if you bend it too much. It is best to cool it to 10ºC or below before bending as it will become much more flexible. You should be able to recognize the difference between yield that it gives you and permanent deformation when bending the foil. If you only deform it, cool, when it yields, it will reward you with a pleasant surprise when you heat it."

Nitinol Products

Other: Spherical Nitinol Powder, Nitinol crucibles, Nitinol nuts, Nitinol bolts, Nitinol heating elements, and Nitinol shielding screens.

Properties（Theoretical）

A shape memory alloy undergoes a phase transition changing from one crystal structure to another at a specific temperature, with substantial forces in theprocess. The most common shape memory alloy is Nitinol (Nickel Titanium Naval Ordinance Lab). Variations in the ratio of nickel to titanium and variations in processing create different nitinol characteristics. Nitinol can exhibit a shape memory effect, where it transitions from one crystalline structure to another, and moves with substantial force in the process, upon the application of heat at a temperature specific to the alloy. Super-elastic nitinol, shares the ability of the alloy to stretch up to 30% of its length without permanent deformation, a highly unusual characteristic for a metal. ATT COMPANY both superelastic and shape memory nitinol in wire, sheet, and tube form. For most projects, we recommend wire as it is the least expensive and most versatile form. In comparison, sheet allows you to create 3-dimensional forms that move, and tube allows you to pump heated/cooled fluid directly through the tube for mess-free, highest efficiency activation. Nitinol can be welded in an oxygen-free environment (use shielding gas).

1. Values listed are for full martensite to austenite transition.

2. Similar to 300 series stainless steel or titanium

3. Highly nonlinear with temperature

4. Hysteresis can be significantly reduced by partial transformation or ternary alloys.

TRANSITION TEMPERATURES

Nitinol changes its crystalization pattern at more than 1 temperature point. The stoichiometric ratio of Ni to Ti, impurities, and post-processing determine the mechanical characteristics of your nitinol.

All transition temperatures are specified in Celsius ºC. The temp indicated is an approximation of where the alloy begins to undergo the crystalline transformation. It occurs over a fairly wide temperature range. So, a 40C rated wire will perform faster and stronger at 80C.

At room temperature, an 80C wire will be substantially more malleable and soft to your fingers, the 40C will be more difficult to bend, and the 15C will feel like spring steel. The 15C will react to a heat source up to 80C, while 80C NiTi is more suitable for exposure up to 150C. The 15C will be malleable at and below freezing temperatures.

RETURN TRANSITION PHASE

A common question concerns the ability of the alloy to transition back to its cold shape upon cooling (double dipping). This alloy will exhibit a slight mechanical effect upon cooling, however it does not exhibit nearly the same level of energy as upon heating. The effect is most noticeable in the 15C wire and NiTiCu, however it is mildly present in all of these alloys, and can be emphasized with proper training.

Applications of Nitinol Foil/Strip

Used in cell phone technology as a retractable antenna, or a microphone boom, due to its highly flexible and mechanical memory nature.

- Used in some novelty products, such as self-bending spoons which can be used by amateur and stage magicians to demonstrate "psychic" powers or as a practical joke, as the spoon will bend itself when used to stir tea, and coffee, or any other warm liquid.

- Nitinol Foil is highly biocompatible and has properties suitable for use in orthopedic implants. Nitinol Foil has seen a large demand for use in less invasive medical devices.

Nitinol Wire is used for many different medical and industrial applications. The table below gives some typical engineering applications for each of our standard Nitinol medical grades:

1. Nitinol Wire is used in guidewires, stents,  stylets, forming mandrels, stone retrieval baskets, orthodontic files, etc.

2. Nitinol Wire provides the best cycling performances at body temperature (37°C).

3. A common application for Nitinol alloy is high-temperature actuators.

4. Nitinol Wire/Rod can be used in a very cold temperature environment.

5. Nitinol Wire is often used in applications that require a high loading and unloading plateau stress at room temperature. Chromium-doped for decreased transformation temperature and increased tensile strength.

6. Nitinol Wire is used in applications requiring increased stiffness. Cobalt-doped for decreased transformation temperature and increased tensile strength.

Packing of Nitinol Foil

Standard Packing:

Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 440 gallon liquid totes Special package is available on request.

ATTs’ Nitinol Foil is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition.

Chemical Identifiers