'Superelastic' alloy could help buildings resist earthquakes

The alloy could be used in the supporting beams of tall buildings to make them more earthquake resistant.

Superelastic alloys are metals that revert naturally back to their original shape after being bent or deformed by outside forces once those forces are removed, and are generally created by mixing two or more other metals together in certain combinations.

The reason that superelastic alloys are able to revert to their prior shape is due to their unique crystal structure, which allows the atoms to shift as a force is applied; as opposed to regular metals, where the force is diffused through the crystal structure, changing its composition.

Superelastic alloys are used in many applications, such as eyeglasses, antennas, and medical tools and equipment.

Prior to the current work, such alloys were only able to revert to their original shape between the range of -20 to 80°C. 

‘The stress increases with increasing temperature, which limits the practical use over a wide temperature range,’ said project lead Toshihiro Omori and co-workers reporting the findings in the the journal Science.