(Of a metal or other solid) consisting of many crystalline parts that are randomly oriented with respect to each other.
- In a polycrystalline metal the crack may extend for only a few grain diameters before the crack propagation changes to stage II.
- These older style panels are made of crystalline or polycrystalline silicon modules.
- The yield stress of iron single crystals are very sensitive to both temperature and strain rate and a similar dependence has been found for less pure polycrystalline iron.
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