The shape memory and superelasticity properties are the most unique properties of this alloy. The shape memory property allows this metal to “remember” its original shape and retain it when heated above its transformation-temperature. It happens due to the different crystal structures of nickel and titanium. This pseudo-elastic metal also shows incredible elasticity which is approximately 10 to 30 times more than that of any ordinary metal.
Here are some basic physical and mechanical properties of this alloy:
Appearance: this is a bright silvery metal.
Density: The density of this alloy is 6.45 gm/ cm3
Melting Point: Its melting point is around 1310 °C.
Resistivity: It has a resistivity of 82 ohm-cm in higher temperatures and 76 ohm-cm in lower temperatures.
Thermal Conductivity: The thermal conductivity of this metal is 0.1 W/ cm-°C.
Heat Capacity: Its heat capacity is 0.077 cal/ gm-°C.
Latent Heat: this material has a latent heat of 5.78 cal/ gm.
Magnetic Susceptibility: Its magnetic susceptibility is 3.8 emu- gm in high temperatures and 2.5 in low temperatures.
Ultimate Tensile Strength: The ultimate tensile strength of this material ranges between 754 and 960 MPa.
Typical Elongation to Fracture: 15.5 percent
Typical Yield Strength: 560 MPa in high temperature; 100 MPa in low temperature
Approximate Elastic Modulus: 75 GPa in high temperature; 28 GPa in low temperature
Approximate Poisson’s Ratio: 0.3
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