Why does titanium nickel have memory function? Nickel-titanium alloys, commonly known as Nitinol, exhibit an extraordinary property known as "shape memory." This characteristic enables the alloy to revert to its original shape after significant deformation. Understanding why nickel-titanium alloys possess this memory function involves exploring their structural and thermal properties, which underpin their exceptional performance in various applications. Exceptional "Memory" Characteristics Nickel-titanium alloys can return to a predetermined shape with remarkable precision, even after enduring millions of deformation and restoration cycles. This resilience makes these alloys invaluable in fields that demand high durability and reliability.