Insights on Solidification of Mg and Mg-AI Alloys by Large Scale Atomistic Simulations

摘要

We investigate the evolution of solid-liquid interfaces in Mg and Mg-9 at % Al during directional solidification by molecular dynamics (MD) simulations. At the initial stages of solidification, several solidification defects such as twins, stacking faults, and grain boundaries form, and at the final stages of solidification no new defects or grain boundaries form. The directional solidification in Mg-AI contains a considerable amount of heterogeneity due to formation of several Mg_(17)Al_(12) precipitates.