Shape Memory Alloys (SMA)
Metallic alloys that can return to a pre-defined shape when exposed to a specific temperature stimulus, enabling actuation without motors or electronics.
Overview
Shape Memory Alloys (SMAs), most commonly nickel-titanium (Nitinol) or copper-zinc-aluminium, exhibit a unique ability to undergo reversible phase transformation between martensite and austenite crystal structures in response to temperature changes. This allows them to recover their original shape after deformation — a property exploited for actuation in automotive systems. Applications include smart air vents that open and close in response to engine temperature, adaptive aerodynamic flaps, active grille shutters for thermal management, and next-generation safety systems. SMAs offer weight-saving advantages over conventional electromechanical actuators.
Automotive Applications
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Properties
Category
Type
Smart Metal Alloy
Available Colors
Available Forms
Key Properties
- Shape memory effect
- Superelasticity
- High actuation force
- Corrosion resistant
- Biocompatible (Nitinol)
- Compact actuation
Technical Specifications
Density
6.45 g/cm³ (Nitinol)
Tensile Strength
800–1,500 MPa (Nitinol)
Temperature Resistance
Transformation temperature typically –100°C to +100°C (tuneable)
Sustainability
Sustainability Rating
SMAs can be recovered and recycled as specialist alloys. Their longevity and elimination of motorised actuators can reduce overall system complexity and energy consumption.