Evolutions of Microclusters of Biodegradable Mg3Ca7 Potential Medical Implant Alloy

摘要

The molecular dynamics simulation calculation on the microclusters evo-lution properties of liquid Mg 3Ca7 during the rapid solidifications has been performed. Re-sults indicated that the icosahedron microcluster played key role in the glass transition which happened at about 600 K;it suggests that the formation and evolution mechanism of icosahedral order is important for the corrosion resistance of medical implant material of Mg-and Mg-Ca based alloys. It is also found that the icosahedron structure is unstable in the liquid and supercooled liquid until the glass transition occurs.