1. Free Recovery: nitinol is deformed at a low temperature, and heated to recover its original shape.
2. Constrained Recovery: The same, except that recovery is rigidly prevented, and thus a stress is generated.containers and bottles in all shapes.
3. Work Production: Here the alloy is allowed to recover, but to do so it must act against a force (thus doing work).
4. Superelasticity: As discussed above, here the nitinol acts as a super spring.