Shape-memory alloys are metallic materials capable
Position 1: This unique characteristic has made shape-memory alloys valuable in biomedical devices, aerospace actuators, and self-expanding surgical stents.
Position 2: The most widely studied of these alloys is nitinol, a nickel-titanium compound whose behaviour depends critically on temperature.
Position 3: Upon heating above the transformation temperature, the crystal structure reverts to an austenitic phase, recovering its original geometry.
Position 4: Shape-memory alloys are metallic materials capable of returning to a predetermined shape after being deformed, a property driven by reversible phase transformations.
Position 5: Below a certain threshold the material exists in a martensitic phase, making it relatively easy to deform plastically.
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