Question: A polycrystalline structure . . . is very uncommon. only occurs in polymeric materials. is very common and is made up of many small crystals

A polycrystalline structure ...
is very uncommon.
only occurs in polymeric materials.
is very common and is made up of many small crystals - grains - that initiate, form on solidification, and grow until they meet up with other small crystals, forming grain boundaries.
A polycrystalline structure . . . is very

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