Ultrafine-grained materials are several materials (UFG) crystalline fine grains size average roughness level. (100 nm to submicron structure; 1000 nm) and nano-level (nano-structure; smaller than 100 nm) to the material with fine grains (UFG) is increasing because of the role these materials tend to have mechanical and physical properties when compared to the rough grainy material. (Coarse-grained materials) to produce the grainy material, divided into two main methods are "bottom-up" and "top-down".
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