Substructure of Ultrafine Grained Metals after Intensive External Influences at Study of Field Ion Microscopy Method
It has been revealed that in Iridium influenced be severe plastic deformation (SPD) a ultrafine grained (UFG) structure is formed (the grain size of 20-30 nm), but in the bodies of grains there are practically no defects of structure, however, after irradiation a subgrain structure, (subgrain size of 3-5 nm) is formed, and in the bodies of subgrains there are defects. The subgrain structure was also revealed in UFG Nickel and Copper after SPD (subgrain size of 3-15 nm), but in the latter case the observed boundary region is broader and subgrain are highly disoriented.
V. Varyukhin et al., "Substructure of Ultrafine Grained Metals after Intensive External Influences at Study of Field Ion Microscopy Method", Materials Science Forum, Vols. 503-504, pp. 995-1000, 2006