X‐Ray Analysis of SPD Nanostructured Materials

Grain Refinement in Metallic Systems Processed by ECAP

“…Because simple shear is the basic process underlying the ECAP processing technique, it is important to make a comparison between the textures developed during the ECAP processing using route A and the established textures resulting from large strain simple shear. [134]. A peculiarity of the ECAP textures was also noted: the ideal orientations appear in significantly rotated positions, where these rotations are 10° after the first pass but decrease to 5° in the subsequent passes.…”

“…21 Experimental pole Figures from the cross sections of samples of (a) Cu, (b) W, and (c) Ti after ECAP through 8 passes using route B C[134].…”

Multiscale Modeling of SPD Processes for Grain Refinement

“…Micro-level. The development of models on the basis of disclination theory and their application for making a conclusion about the grain capacity to split is a micro-level approach to predict the grain refinement [37][38][39]. It's considered that the reason, why the grains of greater diameter split into a number of substructure elements, is the decrease of the total latent energy stored in the due to the plastic deformation inhomogeneities.…”

“…Third, that is the micro-level, the intragranular level or the level of single crystal lattice defects and their aggregates. At this level the regularity of grain refining, the evolution of dislocation density and misorientations between the adjacent grains are analyzed, taking into account the interaction between different defects of the crystalline structure [37][38][39].…”

“…In recent years in our laboratories in cooperation with the scientists from some Russian and foreign universities and scientific institutions a number of investigations, related to the multiscale computer modeling of the processes attending ECAP, have been performed on the example of pure Cu and Ti [1,[8][9][10][11]14,22,[33][34][35][36][37][38][39]. The peculiarity of that modeling is regarding the interconnection between the processes, attending ECAP at different scale levels.…”