Shape Memory Alloys: niti
Shape memory alloy (SMA) properties — transformation temperatures (As, Af, Ms, Mf), recovery strain, superelastic plateau stress, tensile strength, modulus, fatigue life, and hysteresis for NiTi and copper-based alloys
| alloy family | alloy id | austenite finish C (C) | austenite start C (C) | common name | corrosion resistance | density kg m3 (kg/m3) | elongation at break pct (%) | fatigue life cycles (cycles) | hysteresis width C (C) | martensite finish C (C) | martensite start C (C) | max operating temp C (C) | modulus austenite GPa (GPa) | modulus martensite GPa (GPa) | notes | recovery strain pct (%) | tensile strength MPa (MPa) | tensile strength martensite MPa (MPa) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| niti | ni_49.4_ti | 25 | 10 | NiTi Binary (shape memory; Af~25C) | excellent | 6,450 | 15 | 1,000,000 | 20 | -10 | 5 | 80 | 75 | 30 | Near-equiatomic; Af just above body temp; one-way SME; shape memory wire alloy | 8 | 1,000 | 700 |
| niti | ni_50.2_ti | 70 | 55 | NiTi Binary High Temp (Af~70C) | excellent | 6,450 | 13 | 500,000 | 35 | 15 | 35 | 120 | 75 | 30 | Higher Ti content raises Ms/Af; actuator-type SMA | 7 | 950 | 600 |
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