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materials are polycrystalline solids that are composed of many crystallites of varying size and orientation. The change of direction can be random (called random texture) or directly, perhaps because of growing conditions and processing. fiber structure is an example of the latter. Almost all municipalities metals, ceramics and many are polycrystalline. The crystallites are often referred to as seeds, however, the dust grains have a different context. [ 1] dust grains can be composed of small polycrystalline grains.
polycrystalline structure of a solid material which, when cooled, forms crystallites grains at various points within it. The areas where these meet crystallite grains are known as grain boundaries.
For info click on monocrystalline .
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