Composition optimization of high-strength Mg-Gd-Y-Zr alloys based on the structural unit of Mg-Gd solid solution

Mg-Gd-Y-Zr alloys with high strength fall within narrow composition range. The present paper explains their composition rule by establishing the cluster-plus-glue-atom unit of Gd-containing Mg solid solution with the aid of Mg matrix and Mg5Gd precipitate phase. First, based on the structural homologue between Gd-containing Mg solid solution and Mg5Gd precipitate phase and in combination with our previously established method for calculating the...