“…While HPT is still in need of a better understanding of the relationships between microstructure and operational parameters, such as pressure and number of turns, the ECAP process has been intensively studied and some examples of the main research topics are: the determination of deformation textures and the concurrent microstructural evolution [11,12,13]; the influence of interpass billet rotation on microstructural evolution and homogeneity [14,15], the effect of recrystallization or recovery anneal on microstructure, mechanical properties, texture and microstructural stability [16,17,7], and finally how SPD affects precipitation [18,19,20].…”