Abstract
Magnesium (Mg) alloys have broad applications in aerospace, automotive, and military industries due to their excellent mechanical properties. However, poor plastic formability and susceptibility to brittle fracture limit their application. Therefore, in this study, we investigated the shock properties of polycrystalline Mg (polyMg) and analyzed the deformation mechanisms using molecular dynamics (MD) simulations. The results showed that the plastic deformation mechanism of polyMg under shock-wave loading was primarily dominated by grain boundary slipping and grain rotation, followed by the formation of dislocations and twins within the grains. The shock stress of polyMg increased with the increasing shock velocity, but the Hugoniot elastic limit (HEL) did not change below a shock velocity of <1.0 km/s. The wavefront surface width decreased as the grain size decreased, but the shock stress and HEL values remained unaffected. These results can contribute to a better understanding of the nanoscopic dynamic response mechanism of polyMg.
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