查看文章

To explore the refinement mechanism of long period stacking ordered (LPSO) phases and its impact on mechanical properties, a typical Mg₉₇Y₂Zn₁ alloy with α-Mg/LPSO binary microstructure prepared by multi-pass ECAP was systematically investigated. The obtained results indicate that during severe deformation the network 18R phase undergoes a three-step refining process, which includes kinking, zigzagging, and breaking. Lamellar 14H is precipitated first during early ECAP, and then is refined during further ECAP following a similar refining sequence of 18R phase. Moreover, a two-step dynamic recrystallization (DRX) is activated during deformation. In early passes of ECAP, DRX is promoted by 18R kinking through particle-stimulated nucleation (PSN) mechanism, and the precipitation of 14H lamellas suppresses DRX process in this period. After 14H lamellas became kinked, zigzagged and broken with …