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At very low temperatures, ductile materials go through a transition to brittleness - above this point they are more ductile and at their highest toughness, below this point they are brittle and have very low toughness (they simply shatter). The best example of this is the classic liquid nitrogen demo - take something that is easy to damage but can be deformed or torn (a flower petal is what I saw, paper probably works too, or a leaf), dip it in liquid nitrogen, drop it, and it will shatter. This effect also works for steel and all kinds of other ductile materials - though the forces needed to shatter it are such that it's not really safe to get close enough to see.

Other than the ductile brittle transition effect, I have no idea.

Source: My materials engineering course

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