Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by composition]
6. inorganic material
7. metal
8. [metal by quality]
9. alloy

Anotations

Scope note:

Shape memory alloys are imprinted with a shape so that even after they are deformed, a threshold temperature will bring about a return to the original configuration. Copper-aluminium-nickel, and nickel-titanium are the two main types of shape memory alloy.