Nitinol: The Alloy That Breaks the Rules
from David's Gemini Notebook Podcast Collection Hosted by David Weissman
A metal bar rings when warm, lands with a dull thud when cold, and springs back to its original shape when touched by flame. Discovered during Cold War research at the U.S. Naval Ordnance Laboratory, nitinol—a near-equal alloy of nickel and titanium—challenged the basic rules of metallurgy by transforming its crystal structure without breaking the bonds between neighboring atoms. This episode follows nitinol from a pipe-lighter experiment in a Navy boardroom into superelastic eyeglasses, self-expanding medical stents, aircraft components, and woven tires built for Mars. Along the way, we examine the atomic mechanics that make these feats possible, the 4,000-degree manufacturing ordeal behind every reliable batch, and the fatigue and thermal losses that thwarted dreams of limitless clean-energy engines. Could precision 3D printing finally unlock structures whose behavior is programmed atom by atom?
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