How does the crystallization of alloys, which are a mechanical mixture of the smallest crystals of two metals, take place?

How does the crystallization of alloys, which are a mechanical mixture of the smallest crystals of two metals, take place? Give an example of a similar alloy.

An alloy is a mechanical mixture if, when the melt is cooled, crystals of individual metals precipitate. Example: alloys of zinc Zn and tin Sn, aluminum AI and copper Cu, nickel Ni and chromium Cr, lead Pb and tin Sn.

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