Effect of Hot Rolling on the Microstructure and Mechanical Performance of a Mg-5Sn Alloy

A Mg-5Sn alloy was hot rolled at 380 degrees C with three different rolling reductions (30%, 50%, and 70%), and its effect on the microstructure and mechanical performance was examined. Grain size decreases, whereas the area fraction of Mg2Sn particles and dislocation density increase with the increase in rolling reduction. Therefore, the yield strength (YS) and ultimate tensile strength (UTS) exhibit an ascending trend, whereas the elongation (EL) shows a descending trend with increasing rolling reduction. The alloy hot rolled for 70% possesses a high strength of 310 MPa and an EL of 8.4%. The strength enhancement is mainly ascribed to precipitation strengthening, grain refinement strengthening, and dislocation strengthening.

Automated summary

This study investigated the effect of different rolling reductions on the microstructure and mechanical performance of Mg-5Sn alloy. The results show that increasing rolling reduction leads to a decrease in grain size, an increase in the area fraction of Mg2Sn particles and dislocation density, and an enhancement in yield strength and ultimate tensile strength. Conversely, the elongation decreases. The alloy with a rolling reduction of 70% exhibits the highest strength of 310 MPa and an elongation of 8.4%. The strength enhancement is attributed to precipitation strengthening, grain refinement strengthening, and dislocation strengthening.