Nickel-titanium memory alloy
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Nickel-titanium (Nitinol) is a smart functional material primarily composed of nickel and titanium. Its unique "shape memory effect" and superelasticity lead to widespread applications in medical, aerospace, and mechatronics fields.
Product name：
Inconel alloy
Material：
inconel800
Warehouse：
Tianjin
Surface treatment：
Pickled/bright/black etc.
Category：
Keyword：
Nickel-titanium memory alloy
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Details description
Basic Properties
Chemical Composition: Approximately 50%-55% nickel (Ni) and 45%-50% titanium (Ti). Small amounts of other elements (such as copper, iron, and niobium) are usually added to optimize performance.
Phase Transformation Characteristics: The core properties stem from the reversible transformation of the crystal structure (martensite phase ↔ austenite phase). The transformation temperature (phase transition point) can be controlled by adjusting the composition (such as the nickel-titanium ratio), typically ranging from -100℃ to 100℃.
Appearance: Silver-white metallic luster, tough texture, combining the rigidity of metal with a certain degree of flexibility.
Core Performance Characteristics
Shape Memory Effect (SME)
After being deformed at low temperatures, the material automatically recovers its original shape when heated to a specific temperature (austenite phase transition point). The recovery process is precise and repeatable.
One-way memory effect: It can only recover from the low-temperature deformed state to the high-temperature original state.
Two-way memory effect: Heating restores the high-temperature shape, and cooling automatically returns to the low-temperature deformed state (requires special training to achieve).
Superelasticity (SE)
Above the phase transition temperature, the material can withstand elastic deformation far exceeding that of ordinary metals (up to 8%-10%), and it can fully recover its original state after unloading. The recovery process generates "pseudo-elastic" force, combining buffering and resetting functions.
Good Biocompatibility
Non-toxic and non-sensitizing to human tissues, and corrosion-resistant (excellent stability in body fluid environments), making it an ideal material for medical applications.
Other Properties
Mechanical Properties: Tensile strength can reach 800-1500 MPa, excellent fatigue performance, can withstand millions of cycles of deformation.
Corrosion Resistance: Superior to stainless steel, not easily corroded in saltwater, body fluids, and other environments.
Damping Characteristics: Can absorb vibration energy and can be used in damping devices.
Product Forms and Processing Technology
Common Product Forms:
Wire and rod (diameter 0.01mm-5mm): Used in medical sutures, stents, sensors, etc.
Sheet and strip (thickness 0.01mm-2mm): Used in temperature control components and bionic mechanical parts.
Tubing (diameter 0.5mm-20mm): Used in vascular stents and interventional therapy catheters.
Custom shapes: Processed into springs, fasteners, drive components, and other complex shapes according to requirements.
Processing Technology:
Vacuum melting (such as arc furnace, vacuum induction furnace) is required to ensure uniform composition. Subsequent plastic processing such as forging, rolling, and drawing is used for shaping. Then, "shape memory training" (fixing the high-temperature shape + low-temperature deformation treatment) is used to give it memory function.
Typical Application Areas
Medical and Healthcare
Interventional medical devices: Vascular stents (automatically expand and fit the vessel wall at post-operative body temperature), orthopedic screws (recovering to the preset shape with body temperature, reducing surgical trauma), orthodontic wires (easily shaped at room temperature, generating continuous corrective force at oral temperature).
Surgical instruments: Hemostatic clips, sutures (can automatically tighten, reducing the risk of post-operative infection).
Rehabilitation devices: Prosthetic joints (using superelasticity to achieve flexible movement).
Aerospace and Defense
Spacecraft antennas (folded to reduce volume during launch, and expanded to the predetermined shape when heated in space).
Pipeline connection devices (assembled at low temperatures, automatically sealed after heating, suitable for extreme temperature environments).
Missile wing surface drive components (achieving attitude adjustment through temperature changes).
Mechanical and Electronic
Intelligent valves (automatically open/close according to temperature, used in HVAC and automotive temperature control systems).
Eyeglass frames (superelasticity makes them resistant to bending and less prone to deformation and breakage).
Sensors and actuators (converting temperature changes into mechanical actions for precise control).
Daily necessities
Sporting goods (such as golf club heads, ski boot buckles, using superelasticity to improve durability).
Clothing accessories (such as bra underwires, conforming to the body with body temperature, improving comfort).
Implementation Standards and Selection Points
Implementation standards: Common standards in the medical field include ASTM F2063 (specifications for nickel-titanium alloy surgical implants) and ISO 23037 (terminology and definitions of nickel-titanium shape memory alloys); industrial fields refer to GB/T 30038 (nickel-titanium shape memory alloy materials), etc.
Selection points:
Clearly define the phase transition temperature (needs to match the application environment temperature, such as medical use is usually close to human body temperature 37℃).
Select the type of memory effect (one-way/two-way) and mechanical properties (such as superelastic deformation range) according to needs.
Confirm biocompatibility (medical use requires ISO 10993 biosecurity certification).
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