Shape memory.
Superelastic.
Biocompatible.
Nitinol (nickel-titanium 50/50) exhibits shape memory effect and superelasticity — unique metallurgical properties enabling medical stents, dental archwires, actuators, and self-deploying aerospace structures. FDA-approved for implantable medical devices.
Nitinol compositions.
Small composition changes dramatically alter transformation temperature and properties. Medical grade, actuator grade, and superelastic grade optimize different behaviors.
Superelastic
Austenitic at body temperature — exhibits superelasticity. Used for stents, guidewires, dental archwires that recover shape.
Shape Memory
Martensitic at room temp, transforms at specific heat. Used for thermal actuators, deployment mechanisms.
Body-Temperature SMA
Transforms near body temperature. Used for orthodontic archwires that adjust their shape with oral temperature.
Actuator Grade
Optimized for repeatable cycling under mechanical load. Used for precision actuators, aerospace deployment.
Medical Grade
Medical implant grade. FDA certified. Tight composition control for biocompatibility. Used for cardiovascular stents, orthopedic devices.
Non-Magnetic
Certified non-magnetic for MRI safety in medical implants.
Unique Nitinol properties.
No other material combines superelasticity, biocompatibility, and programmable shape change.
Superelastic up to 8% strain
Conventional metals: 0.1-0.5% elastic strain before permanent deformation. Nitinol: 8% strain fully recoverable. Enables flexibility in medical devices.
Shape memory effect
"Remembers" programmed shape — deform cold, heat triggers return to memorized shape. Used for thermal actuators, self-deploying structures.
Biocompatibility
FDA-approved for implantable medical devices. Non-toxic nickel release, excellent corrosion resistance in body fluids.
Fatigue resistant
Can cycle millions of superelastic cycles — dental archwires last years under cyclic loading.
Nitinol applications.
Cardiovascular stents
Self-expanding vascular stents — crimped for delivery, expand to permanent shape at body temperature
Surgical guidewires
Flexible guidewires for catheterization — navigate torturous vasculature, recover shape
Dental archwires
Orthodontic archwires that apply constant corrective force as teeth move
Orthopedic staples
Shape-memory staples that close bone fractures when warmed to body temperature
Eyeglass frames
Flexible eyeglass frames that recover shape after bending
Aerospace actuators
Self-deploying mechanisms in spacecraft — thermal trigger replaces mechanical/explosive actuators
Thermal actuators
Industrial thermostat actuators — simpler than bimetallic designs
Firefighter hardware
Temperature-activated fire sprinkler components
Basket retrieval devices
Flexible surgical retrieval devices — collapse for delivery, expand for use
Nitinol processing.
Machined
Difficult but possible. Sharp carbide, slow speeds, specialized techniques. Often combined with EDM.
Wire EDM
Preferred for complex 2D features in Nitinol sheet. Fine features, no heat damage.
Laser cut
Standard for Nitinol stent tubes — precision strut patterns cut directly from tubing.
Shape set
Critical step: program memorized shape by heating to 500 °C in fixture. Defines the shape it "remembers."
Electropolished
Required for medical devices — smooth surface, reduced nickel release, enhanced corrosion resistance.
Oxide removed
Surface oxide layer cleaned after processing — standard for medical applications.
Passivated
Bright-dip acid passivation to standardize surface condition.
Cannot weld
Conventional welding disrupts nitinol phase transformation. Specialty laser welding possible with careful technique.
Nitinol questions.
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