Nitinol - NiTi Shape Memory Alloy;Titanium Nickel Alloys, SMAs,E FORU

**Product Overview: Nitinol (NiTi Shape Memory Alloy)** **Nitinol** (Nickel-Titanium Naval Ordnance Laboratory) is a unique class of shape memory alloys (SMAs) exhibiting extraordinary properties including the shape memory effect, superelasticity, and high damping capacity. This near-equiatomic intermetallic compound of nickel and titanium represents one of the most commercially important smart materials, capable of recovering its original shape after significant deformation when subjected to appropriate thermal conditions. --- ### **Key Characteristics & Advantages** - **Shape Memory Effect**: Can return to pre-deformed shape when heated above transformation temperature - **Superelasticity**: Exhibits up to 8% recoverable strain through stress-induced martensitic transformation - **Biocompatibility**: Excellent compatibility with human tissue for medical applications - **High Damping Capacity**: Superior vibration and shock absorption characteristics - **Corrosion Resistance**: Excellent resistance comparable to titanium alloys - **Wear Resistance**: Good resistance to abrasion and mechanical wear --- ### **Chemical Composition (Typical Weight %)** | Element | Content Range (%) | Function Description | |------------------|-------------------|-----------------------| | **Nickel (Ni)** | 54.5-57.0 | Primary element controlling transformation temperature and mechanical properties | | **Titanium (Ti)**| Balance | Base element providing shape memory characteristics | | **Carbon (C)** | ≤0.05 | Controlled impurity affecting transformation temperature | | **Oxygen (O)** | ≤0.05 | Controlled to prevent embrittlement | | **Cobalt (Co)** | 0.0-0.50 | Optional addition for property modification | | **Other Elements**| ≤0.1 | Controlled impurities | --- ### **Physical Properties** | Property | Typical Value | Test Conditions | |---------------------------------|------------------------|--------------------------| | **Density** | 6.45 g/cm³ | At room temperature | | **Melting Point** | 1240-1310°C | Varies with composition | | **Transformation Temperature** | -100 to +100°C | Austenite start (As) temperature | | **Thermal Expansion Coefficient**| 6.6-10.4 × 10⁻⁶/°C | Martensite/Austenite phases | | **Thermal Conductivity** | 0.18 W/cm·K | At 20°C | | **Electrical Resistivity** | 0.76-0.82 μΩ·m | Austenite phase at 20°C | | **Latent Heat of Transformation**| 20-40 J/g | During phase transformation | --- ### **Mechanical Properties** | Property | Martensite Phase | Austenite Phase | |------------------------|------------------|-----------------| | **Tensile Strength** | 800-1100 MPa | 1000-1500 MPa | | **Yield Strength** | 100-300 MPa | 400-800 MPa | | **Elongation** | 20-40% | 10-20% | | **Young's Modulus** | 28-41 GPa | 75-83 GPa | | **Recoverable Strain** | 6-8% | 8-10% | | **Hardness** | 180-250 HV | 200-350 HV | --- ### **Transformation Characteristics** - **Austenite Start (As)**: Temperature range -100°C to +100°C - **Austenite Finish (Af)**: Typically 10-30°C above As - **Martensite Start (Ms)**: Typically 10-40°C below As - **Hysteresis**: 20-50°C temperature difference between heating and cooling transformations --- ### **International Standards & Specifications** Nitinol complies with the following international standards: - **ASTM F2063**: Standard Specification for Wrought Nickel-Titanium Shape Memory Alloys for Medical Devices and Surgical Implants - **ASTM F2004**: Standard Test Method for Transformation Temperature of Nickel-Titanium Alloys by Thermal Analysis - **ASTM F2082**: Standard Test Method for Determination of Transformation Temperature of Nickel-Titanium Shape Memory Alloys by Bend and Free Recovery - **ISO 5832-11**: Implants for surgery - Metallic materials - Part 11: Wrought titanium-nickel shape memory alloy - **ISO 22674**: Dentistry - Metallic materials for fixed and removable restorations and appliances --- ### **Applications** 1. **Medical Devices**: - Stents (vascular, esophageal, biliary) - Orthodontic archwires and springs - Guidewires and surgical instruments - Bone anchors and orthopedic implants - Dental files and rotary instruments 2. **Aerospace and Defense**: - Cryogenic couplings and fittings - Actuators for deployment mechanisms - Vibration damping systems - Morphing wing structures - Self-deploying antennas 3. **Automotive Industry**: - Engine thermal management actuators - Comfort system components - Safety release mechanisms - Vibration control devices 4. **Consumer Products**: - Eyeglass frames - Cellular phone antennas - Coffee pot thermostats - Sporting goods equipment 5. **Industrial Applications**: - Pipe couplings for offshore platforms - Electrical connectors - Robotic actuators - Thermal valves and controls --- ### **Manufacturing Considerations** - **Melting**: Vacuum arc remelting or vacuum induction melting - **Hot Working**: Forging and rolling at 700-900°C - **Cold Working**: Possible with intermediate anneals - **Heat Treatment**: Critical for setting transformation temperatures - **Machining**: Difficult due to work hardening; typically EDM or laser cutting - **Surface Treatment**: Passivation, electrophishing, or special coatings --- ### **Available Forms** - **Bar and Rod**: Diameters from 0.1mm to 100mm - **Wire**: Diameters from 0.05mm to 5.0mm - **Sheet and Strip**: Thickness from 0.025mm to 5.0mm - **Tube**: For stent manufacturing and other applications - **Custom Shapes**: For specific device requirements --- **Disclaimer**: *The information provided is for technical reference purposes only. Nitinol properties are highly sensitive to composition, processing history, and heat treatment. Transformation temperatures and mechanical properties can vary significantly based on these factors. Users should conduct thorough testing and validation for specific applications. Medical applications require compliance with appropriate regulatory standards and thorough biocompatibility testing. Always consult with materials specialists for critical applications.*

Packing of 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 3115 gallon liquid totes Special package is available on request.