Superelastic Nitinol Sheet

Superelastic nitinol sheet is also called shape memory alloy. The high-temperature phase of shape memory alloy has high structural symmetry, usually an ordered cubic structure. Below the Ms temperature, the high-temperature phase with a single orientation transforms into a martensitic variant with different orientations. When the material is deformed below the Ms temperature to make components, the martensite variants in the material that are at a disadvantage in the stress direction are continuously reduced; those in a favorable position are constantly growing. Eventually transforms into an element of ordered martensite with a single orientation. If it is heated above the As point again, when the low-symmetry, single-orientation martensite undergoes reverse transformation, the previous single-orientation high-temperature phase is formed again. Corresponding to this reversible transformation of the microstructure, the macroscopic shape of the material at high temperature is restored, which is the so-called one-way shape memory. The memory element processed by a certain process can return to the shape at a low temperature when it is cooled below Ms, which is called the two-way shape memory effect of the superelastic nitinol alloy sheet.

 

 

(1) One-way memory effect

Shape memory alloys are deformed at lower temperatures and can recover their shape after heating. This shape memory phenomenon that only exists during heating is called the one-way memory effect.

(2) Two-way memory effect

Some alloys restore 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 memory effect

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

 

Name	Grade	Transformation temperature AF	Form	Standard
Shape Memory Nitinol Alloy	Ti-Ni-01	20℃ ~ 40℃	wire, bar, plate, tube	customer-specified or industry standard
	Ti-Ni-02	45℃ ~ 60℃
		60℃ ~ 80℃
		80℃ ~ 95℃
Superelastic Nitinol Alloy	TiNi-SS	-5℃ ~ 5℃
Low-Temperature Superelastic Nitinol Alloy	TN3	-5℃ ~ -15℃
	TNC	-20℃~ -30℃
Medical Nitinol Alloy	TiNi-SS	33℃+/-3℃		ASTM F2063
Narrow Hysteresis Nitinol alloy	Ti-Ni-Cu	As-Ms≤ 5℃	wire, bar	Â
Wide Hysteresis Nitinol alloy	Ti-Ni-Fe	As-Ms≤150℃	Â	Â

 

The shape memory alloys that have been successfully developed include TiNi-based shape memory alloys, copper-based shape memory alloys, and iron-based shape memory alloys.

 

 

• Shape memory: After being bent or twisted, it can disappear the accumulated strain by heating and return to its original shape, that is, it has shape memory function.
• Superelasticity: Shape memory nitinol sheet has superelasticity, and its elastic modulus is about 10 times that of steel, which can withstand large deformation while maintaining good elastic recovery.
• Corrosion resistance: It has good corrosion resistance, can be used in high temperature, high pressure, and humid environment, and is not easily affected by the external environment.
• High-temperature stability: The shape memory nitinol plate still has good mechanical properties at high temperatures, and its shape memory function and superelasticity still exist.
• Machinability: It can be processed into parts of different shapes and applied in different fields, such as medical equipment, auto parts, aerospace, etc.

 

 

 

 

In general, it has the advantages of shape memory, superelasticity, corrosion resistance, high-temperature stability, and processability, and has been widely used in many fields.

 

It is an alloy sheet with shape memory properties, its main application areas include:

 

1) Medical devices: It can be used to make medical devices such as stents, clamps, and catheters for interventional surgery and diagnosis and treatment, such as vascular stents, heart valve stents, endoscopic clips, etc.

2) Aerospace: It can be used to make aerospace devices, such as engine blades, aerospace structural parts, thermal mechanical components, etc.

3) Automobile manufacturing: It can be used in the manufacture of auto parts, such as brake calipers, engine valves, clutch pressure plates, etc.

4)Mechanical manufacturing: It can be used to manufacture various mechanical parts, such as valves, pump bodies, springs, etc.

 

Superelastic nitinol sheet can also be used in the manufacture of components in the fields of electronics, communications, construction, and textiles.

 

 

 

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