Identification and description of intermetallic compounds in Mg-Si-Sr cast and heat-treated alloys

The Mg-rich side of the Mg-Si-Sr phase diagram is constructed based on descriptions of the binary phase diagrams Mg-Si, Mg-Ca and Ca-Si from literature and assuming complete solubility (i.e. a line compound) between the ternary phase MgSiSr and the binary phase Sr2Si. It is also assumed that MgSi2Sr is a stoichiometric compound. These assumptions were made based on the chemical similarities between Ca and Sr and between Si and Sn, and the similarity in crystal structures between the two studied ternary compounds of the Mg-Si-Sr diagram and the ternary compounds present in the Ca-Mg-Si and Mg-Sn-Sr system. A good agreement is found between the constructed phase diagram and the experimental results.