Nickel titanium
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Nickel titanium, also known as nitinol, is a metal alloy of nickel and titanium, where the two elements are present in roughly equal atomic percentages. Different alloys are named according to the weight percentage of nickel; e.g., nitinol 55 and... Wikipedia
Melting point: 1,310 °C (2,390 °F)
Density: 6.45 g/cm3 (0.233 lb/cu in)
Coefficient of thermal expansion (austenite): 11×10−6/°C
Elastic modulus (austenite): 75–83 GPa
Electrical resistivity (austenite): 82×10−6 Ω·cm
Magnetic permeability: < 1.002
Magnetic susceptibility (austenite): 3.7×10−6 emu/g