In extreme cold conditions, from deep space to cryogenic fuels, ordinary metals become brittle and fracture. Tests of the Titanic’s hull steel, for example, showed it was about 10 times more brittle at freezing than modern steel. Now, researchers report an alloy built at the atomic scale that bucks this trend. By heating and shaping a cobalt-nickel-vanadium alloy, they coaxed atoms into two different ordered patterns inside it. The result: a metal that remains strong and tough even at –186°C.
Engineering an alloy atom by atom
According to a study published in the journal Nature, scientists have engineered a “dual-ordered” structure inside a cobalt-nickel-vanadium alloy. Heat treatment and deformation caused atoms to self-assemble into sub-nanoscale islands of one pattern (short-range order) alongside larger nanoscale domains of another pattern (long-range order).
This atomic architecture impedes crack growth and keeps the metal ductile even as temperature drops. In tensile tests at –186°C, the alloy remained exceptionally strong and absorbed much more strain before cracking than normal metals. Precise atomic design can give metals unprecedented toughness in the cold.
Applications in space and energy
The new alloy has obvious practical applications due to its cold tolerance. It might be utilized in spacecraft components to endure the intense cold of deep space. Additionally, it could fortify cryogenic fuel infrastructure, like LNG tanks or pipelines.
Other cryogenic systems, such as those that store hydrogen or oxygen fuel, might even benefit from the strategy. According to the researchers, other metal systems could also benefit from the application of their atomic-level approach, which could result in the development of new materials that are resilient in the most extreme cold.
