单词	polycrystalline
释义	polycrystalline /ˌpɒlɪˈkrɪstəlʌɪn / adjective (Of a metal or other solid) consisting of many crystalline parts that are randomly oriented with respect to each other: a polycrystalline silicon wafer... 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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