Tin cry
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Tin cry is the characteristic sound heard when a bar made of tin is bent. Variously described as a "screaming" or "crackling" sound, the effect is caused by the crystal twinning in the metal.[1] The sound is not particularly loud, despite terms like "crying" and "screaming". It is very noticeable when a hot-dip tin-coated sheet metal is bent at high speed over rollers during processing.
Tin cry is often demonstrated using a simple science experiment. A bar of tin will "cry" repeatedly when bent until it breaks. The experiment can then be recycled by melting and recrystallizing the metal. The low melting point of tin, Template:Cvt, makes re-casting easy. Tin anneals at reasonably low temperature as well, normalizing tin's microstructure of crystallites/grains.
Although the cry is most typical of tin, a similar effect occurs in other metals, such as niobium,[2] indium,[3] zinc,[2] cadmium,[4] gallium,[2] and solid mercury.[5]
References
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