Insight on the correlation between bimodal-sized grain structure and tensile properties of extruded low-alloyed Mg-Sn-Bi-Mn alloy

In this study, a novel low-alloyed Mg-2Sn-2Bi-0.2Mn (wt.%) alloy is designed and extruded successfully at 523 K. Microstructural analysis reveals that a bimodal-sized grain structure is obtained due to the abnormal dynamic recrystallized (DRXed) grain growth. The results indicate that the studied alloy exhibits a good balance between strength and ductility with a tensile yield strength (TYS) of 299.7 MPa, an ultimate tensile strength (UTS) of 382.6 MPa, and an elongation (EL) of 21.2%. Besides, the underlying strengthening mechanism and ductility enhancement are analyzed and discussed in terms of bimodal-sized grain structure.

Automated summary

A novel low-alloyed Mg-2Sn-2Bi-0.2Mn alloy was successfully designed and extruded, demonstrating a good balance between strength and ductility. The bimodal-sized grain structure played a crucial role in achieving this balance, as analyzed in the study.