Humans have been cooling metal mixtures from liquid to solid for thousands of years. But surprisingly, not much is known about exactly what happens during the process of solidification. Particularly puzzling is the solidification of eutectics, which are mixtures of two or more solid phases. Engineering mental components for example an airplane wing that's stronger in some places and lighter in others. You could make lighter and more fuel-efficient automotive components. The possibilities are just about endless.
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