The blog claim that nitinol is the most flexible metal, exceeding the flexibility of other alloys like beta-C titanium, 7068 aluminium and extra-hard or hyten 304 stainless steel wire. This impressive flexibility stems from its unique ability to withstand a strain of nearly 8% while still returning to its original shape. However, it’s important to note that this 8% strain cannot be sustained in continuous cyclic bending.

Understanding Nitinol’s Flexibility

Nitinol gets its flexibility from being a shape memory alloy (SMA), a type of metal that can “remember” and return to its original shape after being deformed. This characteristic comes from the unique arrangement of nickel and titanium atoms within the alloy.

What Makes Nitinol Special?

  • Superelasticity: Nitinol eyeglass frames showcase this property by twisting 180° without permanent deformation. They also provide a constant, comfortable pressure against the head.
  • Biocompatibility: This makes nitinol safe for use in medical implants, such as stents that can be compressed for insertion and then expand to their original shape within the body.
  • Orthodontic Applications: Nitinol’s shape memory effect is utilised in orthodontic archwires, which apply a controlled amount of pressure to gradually adjust teeth.
  • Additional Properties: Nitinol boasts excellent corrosion resistance, fatigue resistance, and a high damping effect, making it suitable for various applications.

Different Types of Nitinol

Nitinol alloys are named based on the weight percentage of nickel, such as nitinol 55 and nitinol 60. This indicates that different compositions may exhibit varying properties tailored to specific applications.

Nitinol’s Role in Medical Devices

Nitinol’s use in endovascular stents is widespread and has a proven track record of safety and effectiveness. Its application in orthopaedic fracture surgery dates back to the 1980s, highlighting its long-standing role in the medical field.

Beyond Medical Use

While the sources primarily focus on medical and eyeglass frame applications, they also mention nitinol’s use in heat engines and other scientific and industrial applications. This suggests a wider range of potential uses for this remarkable metal.

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