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Shape memory materials (SMMs) are a class of smart materials that can recover their original shape after deformation when exposed to an appropriate external stimulus, usually temperature. This unique property arises from a reversible solid-state phase transformation between two crystallographic structures: martensite (low-temperature phase) and austenite (high-temperature phase). The martensitic phase ______ ______ _______ ___ ______ __________ ___ ___.
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