Microstructure and mechanical properties of extruded Mg-Y-Zn (Ni) alloys

The microstructure and mechanical properties of extruded Mg-2Y–1Zn (MYZ), Mg-2Y-0.5Zn-0.5Ni (MYZN) and Mg-2Y–1Ni (MYN) (at%) alloys were systematically investigated. Apart from α-Mg, Mg2Y, Mg24Y5, along with Y-riched phases, there was precipitation of 18R LPSO phase with coarse-lamellar morphology at the dendritic grain boundary of α-Mg within the above three as-cast alloys. Parts of 18R LPSO phases transformed into 14H LPSO phases in...