G–D Map Method for Analyzing Effects of Elements on Size Control of In Situ Formed Mg2Si in Mg Melts

Microstructural characterisation and mechanical properties of the cast Gd-containing Mg−8Mg2Si in situ composites

“…Consequently, many attempts have been made to take advantage of adding various alloying elements such as Sb [9], Bi [10], Sr [11], Ba [12], Ca [13], P [14], as modifiers during solidification of the Si-containing Mg alloys and composites to improve their mechanical properties. Using a G-D map obtained from thermodynamic and kinetic principles, Tian et al analysed the influence of several elements on the size of in situ formed Mg 2 Si particles in Mg melts [15]. They found that P, Sb, Sn and Sr refine Mg 2 Si through enhancing the nucleation rate and reducing the growth rate, while, Mn, Ti, V and Zr contribute to coarse-shaped Mg 2 Si by delaying nucleation.…”