Why Metals Turn Brittle in the Cold

In October 2026 an international team led by UC Berkeley, Berkeley Lab and the University of Oxford reported in Nature two experimental alloys that stay tough at −253 °C, although their crystal structure is the kind that usually turns brittle. This film explains the fundamentals: ductile and brittle fracture, the FCC and BCC ways of stacking atoms, how dislocations let metals bend and why they stall in the cold, the ductile-to-brittle transition, the Charpy test of 1901, the Liberty ships that cracked in the Second World War and Constance Tipper's work, the 1944 Cleveland gas-tank disaster, and the metals chosen for liquefied gas and liquid hydrogen today.

Bend or snap

Why cold turns some metals brittle, and what engineers do about it.

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