A 70-year assumption about metal strength breaks down at extreme speeds, according to new research from Cornell Engineering. Scientists found that metals with smaller grains actually soften when struck at supersonic speeds, overturning a long-standing rule of materials science.
The study, published in Physical Review Letters, used laser-driven microprojectiles to slam into copper faster than the speed of sound. Under those conditions, larger grains absorbed more energy and resisted damage better than smaller ones.
Researchers traced the reversal to how atomic defects behave at ultra-high strain rates, where interactions with vibrating atoms change how metals deform. The discovery could reshape designs for armor, spacecraft shielding, and high-impact manufacturing.
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