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Metals that stay tough in the deep freeze

So, researchers have found two experimental niobium-titanium alloys that resist becoming brittle even at a frigid 20 kelvin. Instead of relying only on the usual movement of defects in their crystal structure, the alloys form nanoscale twins and new crystal regions that help absorb stress. These microscopic changes create extra ways for the metals to deform, making it harder for cracks to spread. I find it exciting that this discovery could guide the design of tougher materials for energy, transport, and aerospace systems.
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