Shape Memory Alloys: cu_zn_al
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) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| cu_zn_al | cu_20zn_8al | 0 | -15 | Cu-20Zn-8Al (low temp) | fair | 8,100 | 10 | 100,000 | 25 | -55 | -25 | 60 | 75 | 65 | Lower transformation temp variant; composition-tunable Ms -100 to +100C | 5 | 550 |
| cu_zn_al | cu_25zn_5al | 60 | 45 | Cu-25Zn-5Al | fair | 8,000 | 10 | 100,000 | 40 | -10 | 20 | 100 | 80 | 70 | Cu70Zn25Al5 wt% approx; low cost SMA; Ms sensitive to composition | 5 | 600 |
| cu_zn_al | cu_26zn_4al_high | 100 | 80 | Cu-26Zn-4Al (high Af) | fair | 8,000 | 8 | 50,000 | 50 | 20 | 50 | 130 | 78 | 68 | Higher Zn raises transformation temp; thermostat applications | 4 | 580 |
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