[4] Shape-memory alloys - Monster magnet meets magnetic fluid.

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[4] Shape-memory alloys - 

These alloys can be deformed into a new shape when cold, and then return to their original shape when heated. This unique property allows them to be used in medical implants and even in bendable eyeglasses.

Shape-memory alloys are a class of materials that can "remember" their original shape and return to it when they are heated or subjected to other stimuli. These alloys are able to do this because of their ability to undergo a reversible phase transformation from a low-temperature, deformable state to a high-temperature, rigid state.

One of the most common shape-memory alloys is Nitinol, which is made from a combination of nickel and titanium. Nitinol can be deformed into a new shape at low temperatures, and then return to its original shape when heated to a specific temperature.

Shape-memory alloys have a variety of potential applications in fields like medicine and engineering. For example, they can be used in orthodontic braces and other medical implants that can be easily shaped to fit a patient's anatomy and then return to their original shape once implanted. They can also be used in devices like bendable eyeglasses and self-deploying satellite antennas.

Research is ongoing to develop new shape-memory alloys with different properties and applications.

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