Ability of an orthodontic wire to spring back to its original shape is evaluated by:
Popularly, the term resilience is associated with springiness, but it means precisely the amount of energy absorbed within a unit volume of a structure when it is stressed to its proportional limit. The resilience of two or more materials can be compared by observing the areas under the elastic region of their stress-strain plots assuming that they are plotted on the same scale. The material with  the larger elastic area has the higher resilience.
Phillips dental materials 12th edition page no 55
Brittleness
Resilience
Tensile strength
Toughness