NiTiHf is a ternary shape memory alloy combining nickel, titanium, and hafnium, engineered to extend the operating temperature range beyond conventional NiTi by raising transformation temperatures while maintaining superelastic and shape-memory functionality. It is used in aerospace propulsion systems, high-temperature actuators, and thermal-cycling-resistant seals where traditional NiTi becomes unreliable; the hafnium addition is critical for applications demanding performance above 100°C where shape recovery and damping are essential design features. Compared to NiTi, NiTiHf trades some strain capacity and thermal stability window for significantly higher service temperatures, making it the material of choice when heating rules out conventional shape memory alloys but full-ceramic or superalloy rigidity is undesirable.
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1 interactive curve for this material
Stress-strain, S-N fatigue and environmental knockdown curves are free with an account.
Create free account| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Recovery Strain(ε_rec) | 4.000 | - | — | ||
Stress–Strain Curve(σ–ε) | Curve (10 pts) | Pa | 200°C | ||
Superelastic Plateau Stress(σ_SE) | 700.0 | MPa | — | ||
Ultimate Tensile Strength(σUTS) | 1.000 | GPa | — | ||
Young's Modulus(E) | 70.00 | GPa | notes |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Austenite Finish Temperature (Af)(Af) | 473 | K | — | ||
Austenite Start Temperature (As)(As) | 443 | K | — | ||
Martensite Finish Temperature (Mf)(Mf) | 393 | K | — | ||
Martensite Start Temperature (Ms)(Ms) | 423 | K | — | ||
Melting Point / Solidus(Tm) | 1,473.2 – 1,623.2 | K | — | ||
Maximum Service Temperature(Tmax) | 573.2 | K | — | ||
Thermal Hysteresis(ΔT_hyst) | 50.00 | K | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Density(ρ) | 7.800 | kg/m³ | — |