‘Rule-breaking’ study challenges long-held belief that heat always softens metal
SMRTR summary
Northwestern University engineers have shattered a foundational metallurgy principle by discovering that pure metals become harder, not softer, when heated under extreme high-speed conditions. Using specialized equipment to fire microscopic particles at metal surfaces at hundreds of meters per second, researchers found that pure metals like nickel and gold strengthen when heated to 155°C during ultra-fast impacts lasting fractions of microseconds. This counterintuitive effect occurs because atomic vibrations create resistance barriers during rapid deformation, but disappears when even 0.3% impurities are added.
SMRTR provides this summary for quick context. The original article belongs to Interesting Engineering.
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