For the method "top-down" rough grainy material are as grainy materials by entering a serious raengkratham to cause changes to the structure of the material. Because of this technique is to provide a tremendous piece of raengkratham. This method is called causing the severe damage the plastic format (Severe Plastic Deformation, SPD) pieces of work produced by this method is a bit grainy. There is no other particle contamination, and there are no pores.
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