Abstract
The present work explored the microstructure and mechanical properties of Mg-Y-Zn-Sn alloys with varied long period stacking ordered (LPSO) phases, including 18R and/or 14H LPSO phases, which were obtained by controlling the Y content in alloys. The results show that the lamellar-shaped 14H LPSO phase can greatly refine the average grain size of alloys from 60 μm in as-annealed state to 3 μm in extrusion state through the combined effects of kink bands, interspaces and dense stacking faults (SFs) occurred during dynamic recrystallization (DRX), while the existence of dense 18R LPSO phase can only reduce the grain size from 20 to 10 μm for an obviously restricted effect in DRX process. It is interesting to find that the alloy containing 18R LPSO phase exhibits higher strength but lower ductility in both as-annealed and as-extruded states than that with lamellar-shaped 14H LPSO phases, and the relevant mechanism has been discussed.
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