Nitinol (NiTi) Shape Memory Alloy Wire

Nitinol (Nickel-Titanium alloy) wire is a shape memory and superelastic alloy widely used in medical devices, robotics, aerospace, and precision engineering applications.

One of its most critical performance parameters is the Af (Austenite Finish) temperature, which determines the temperature at which the alloy fully recovers its shape and exhibits superelastic behavior.

Although Ni content typically ranges from 54.5% to 57.0%, in accordance with ASTM F2063-18, the Af temperature is highly sensitive to small variations in chemical composition and thermo-mechanical processing history. Therefore, precise grading and composition control are essential for consistent performance.

At Changsheng Titanium, each Nitinol grade is carefully identified and controlled using a detailed alloy coding system to ensure stable and repeatable functional properties.

Nitinol Wire Key Characteristics

Superelasticity (large recoverable strain)

Shape memory effect (thermal activation recovery)

Excellent fatigue resistance

High corrosion resistance

Biocompatibility for medical use

Stable performance under repeated loading cycles

Af Temperature Note

The actual Af temperature may vary depending on alloy composition and thermo-mechanical processing history.

Precise control of Af is essential for:

Medical stents

Guidewires

Orthodontic wires

Actuators and sensors

Material Standard

ASTM F2063-18 (Medical Grade Nitinol)

Applications

Medical Field

Vascular stents

Orthodontic archwires

Guidewires

Surgical devices

Industrial Applications

Micro-actuators

Robotics components

Precision springs

Temperature-sensitive mechanical systems

Aerospace & Engineering

Adaptive structures

Vibration control systems

Smart mechanical assemblies

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