Ultrafine-grained materials of several materials (UFG) is a crystalline fine grains size the average Micron. (100 to 1000 nm; submicron structure nm) and nano-level (nano-structure; smaller than 100 nm), the material is grainy resolution (UFG), there are more roles because this type of material is likely mechanical and physical properties are better compared to the rough grainy material. (Coarse-grained materials) to produce the grainy material split into two major methods are "bottom-up" and "top-down"
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