Observe what happens to the nitinol paper clip on the hot surface! Does this work for any deformation? Compare the unbent nitinol paper clip with a regular paper clip!
Nitinol is a metal alloy of nickel and titanium with unique properties, including superelasticity or pseudoelasticity and “shape memory” properties. That means nitinol can remember its original shape and return to it when heated. It also shows great elasticity under stress.