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Shape memory materials are a unique class of materials that can return to their original shape after being deformed when exposed to a specific stimulus, typically temperature. This ability arises from a reversible solid-state phase transformation between two crystallographic structures: martensite and austenite. In the case of NiTi (nickel-titanium) alloys, also known as Nitinol, the material exists in the low-temperature martensitic phase, which ________ ______ _____ __________ ____ ________ ________.
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