Which metal alloy contains nickel content of about 45%?

• A. Titanium
• B. Cobalt-chrome
• C. Stainless steel (8-35%)
• D. Nitinol (45% nickel)

Answer: (D)

Nickel content varies among alloys, and the material with about half nickel is Nitinol, a nickel-titanium alloy. That higher nickel content gives Nitinol its distinctive shape memory and superelastic properties, which is why this alloy is favored for applications like implants, stents, and orthodontic devices. Titanium, cobalt-chrome, and typical stainless steels use far less nickel and rely on other elements to define their properties, so none of them sit near the 45% nickel mark. In short, the alloy known for roughly 45% nickel is Nitinol, thanks to its nickel-titanium composition that enables shape memory and superelastic behavior.