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Nitinol Memory Alloy

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Shape Memory Alloys (SMAs) have been considered as one of the most promising smart materials. They can provide novel solution in several fields, for various applications (e.g. actuator, biomedical application, clamping systems, ect.). Shape Memory Alloys demonstrate a unique ability to recover their initial shape after deformation through a reversible thermo-elastic phase transformation, it allows Shape Memory Alloys to recover large strains, either spontaneously (pseudo elasticity) or through an increase in temperature (Shape Memory Effect). Among the commercially available Shape Memory Alloys, nickel–titanium (Ni–Ti and Ni–Ti based) ones are outstanding due to their excellent performance and reliability, in addition to strain recovery, Ni–Ti is attractive for several medical applications due to its biocompatibility, corrosion resistance and fatigue behavior.
Near-atomic ratio of Ti-Ni alloy was the first material to be used as a shape-memory alloy. Due to its excellent shape memory function, good heat and corrosion resistance, high strength, unique thermal and fatigue resistance, high biocompatibility and high damping characteristics, it is widely used in many fields.
Ti-Ni shape memory alloy's Phase Transition Temperature is very sensitive to its composition, with each additional 0.1% Ni causing the Phase Transition Temperature to drop 10°C. Adding a third element will also significantly influence the Ti-Ni alloy's Phase Transition Temperature.

Application

Ti-Ni shape-memory alloy wire can be used in cell phone antennas, children's toys, experimental materials, eye glasses components and medical equipment such as surgical stitching wire, birth control loop and high-quality memory alloy wire of other areas.

Specification
Product Size Composition Application
Rod & Wire 0.1mm min Dia. Ni: 54.5-57%, Ti: Balance Spring, Finishing rod, Medical
Plate & Sheet & Strip (Cold rolled) 0.05mm min T x 270mm max W x L Ni: 54.5-57%, Ti: Balance Spring, Medical Equipment and Implant Part
Tube & Capillary 0.8mm OD Min x 0.15mm x L Ni: 54.5-57%, Ti: Balance Medical Equipment and Implant Part


Alloy Type

Type Description
Two way-Shape Memory Alloy that restore high-temperature phase shape when heated, and restore cooling temperature phase shape when cooled
One way-Shape Memory Alloy deform at lower temperature, restore the shape before deformation when heated. It only shows shape memory phenomenon when heating

Glossary

Shape Memory Effect: "Shape Memory" describes the effect of restoring the original shape of a plastically deformed sample by heating it.

Superelastic Effect: An elastic (reversible) responses to an applied temperature, caused by a phase transformation between the austenitic and martensitic phases of a crystal.

MS: The starting temperature of SMA transform from austenite to martensite

MF: The ending temperature of SMA transform from austenite to martensite

AS: The starting temperature of SMA transform from martensite to austenite

AF: The ending temperature of SMA transform from martensite to austenite

Memory Alloy Products

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