Microstructures, Damping and Mechanical Properties of Mg-0.8Si Alloy under Different Rolling Strain Rates

Mg-0.8Si alloy plates were rolled at high strain rates of 15, 20, and 25 s(-1), and the effects of the rolling strain rate on the microstructure, mechanical properties, and damping properties of the Mg-0.8Si alloy were studied. With the increasing strain rate, the area fraction of DRX in the HSRRed Mg-0.8Si alloy gradually increases, resulting in the decrease in dislocation density and dislocation tangles. A higher strain rate can enlarge the grain size of the Mg-0.8Si alloy, so the basal texture and tensile strength can both decrease because of the increased strain rate. The maximal elongation is 8.40% at 20 s(-1). The damping properties of HSRRed Mg-0.8Si alloy increase with the strain rate and the critical strain amplitude gradually decreases.

Automated summary

The effects of high strain rate rolling on the microstructure, mechanical properties, and damping properties of Mg-0.8Si alloy plates were investigated. The results showed that with increasing strain rate, the fraction of dynamic recrystallization in the alloy increased, leading to a decrease in dislocation density and dislocation tangles. Higher strain rates also resulted in larger grain size, which decreased basal texture and tensile strength. The alloy exhibited a maximum elongation of 8.40% at a strain rate of 20 s(-1). The damping properties increased with strain rate, while the critical strain amplitude decreased.