Ni-Ti shape memory alloys are extremely interesting materials both for their ability of showing the shape memory effect (SME) and for their elevated strength and ductility. Shape memory alloys do exactly as their name would suggest; they're metallic materials that are able to remember, and return to, their original shape (the shape they are given when made, say as a casting or an extrusion) under the right stimuli. The principle behind this unusual phenomenon comes from two diverse atom arrangements (crystal structures) present in this material - one at high temperatures and one at low temperatures - that are reversible. At high temperatures, where one of the crystal structures is favoured, the material can be shaped as desired and it retains this geometry as it cools to lower temperatures. Cooled, the material can be bent and twisted beyond all recognition of its previous guise but, on heating, the low temperature atomic arrangement reverts to its previous form and, in so doing, miraculously returns to its previous shape. 1.Low Density and High Strength 2.Excellent Corrosion Resistance 3.Good resistance to effect of heat 4.Excellent Bearing to cryogenic property 5.Nonmagnetic and Non-toxic 6.Good thermal properties
Applications: SMAs have been used in a wide variety of applications spanning diverse industries. Apart from the flexible spectacle frames mentioned above, they can be used in bioengineering applications such as dental wires such as those used in dental braces, mending broken bones using metal plates, and for medical devices that help open clogged veins and arteries. They are used as wires and tubes in applications with hot fluids flowing through them. These materials are ideal as they can retain their shape even in a heated environment. Another application of SMAs is in civil engineering. For example, they have been used in bridge structures. SMAs can dampen vibrations, hence tuning the natural frequency of various structures. This property of vibration damping has also been used in launchvehicles and jet engines. Newer lightweight alloys have also been discovered, such as magnesium-scandium that can have a variety of potential applications such as in aerospace applications and the medical industry for biodegradable self-expanding stents. SMAs can be also used as actuators because of their ability to change shapes and have potential applications in aircraft and space vehicles because they are lighter and can help save energy compared to bulky mechanical actuators. Earlier this year, NASA demonstrated a nickel-titanium SMA actuator used in folding the outer portions of wings during flight. This change in the angle of the plane's wings according to wind and turbulence helps reduce energy use. nother possible application of SMAs is in retrofitting buildings that are not designed considering seismic conditions. Here, the ability of SMAs to undergo large deformations with very little residual strain as well as their ability of reversible shape change with hysteresis is used. A beam column joint can be retrofitted with reinforced concrete using pre-stressed SMA wires. This significantly increases their shear strength and axial loading capacity, compared to wires that are stressed only when the concrete starts expanding. Welcome send drawings for OEM service .
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