The lamellar eutectic structure produces the characteristic zebra stripes. The reason this microstructure results is because the liquid must split into two different solids with different compositions at a single temperature. Since the transitions happens quickly and diffusion lengths are limited due to the lower temperature, the atoms can't move far and we end up with thin stripes of the two solids.
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Why does the eutectic lamellar structure form the way it does?
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