Tohoku Uni breakthrough alloy designed for extreme cold environments

Researchers have developed a novel copper-based alloy exhibiting a shape memory effect at temperatures as low as -200°C, a capability not consistently found in existing materials. Shape memory alloys are defined by their ability to be deformed when cold and subsequently recover their original shape upon heating, effectively ‘remembering’ their initial configuration. This new alloy addresses a performance gap identified in previously studied nickel-titanium alloys, which lose their shape memory function below -20°C, and other existing low-temperature alloys that have lacked practical implementation properties.

The developed alloy has been successfully prototyped as a functional actuator in a mechanical heat switch, demonstrating its capacity for substantial work output at temperatures below -100°C. Actuators, crucial components in both space-bound machinery and everyday devices, convert input power into mechanical movement. The prototype switch effectively controlled heat transfer through switching between contact and non-contact states, highlighting a potential application in environments requiring precise thermal regulation.