In　the　present　work,　the　microstructure,　texture　and　mechanical　properties　of　the　as-extruded　Mg-xZn-yEr　(x=3,　6　and　9;　y=0.5,1　and　1.5;　x/y=　6)　alloys　were　investigated.　The　results　showed　that　the　I-phase　in　the　as-cast　alloys　was　destroyed　and　lots　of　nano-scale　quasicrystalline　particles　were　precipitated　within　the　matrix　during　hot　extrusion　process.　With　the　increase　in　the　volume　fraction　of　the　primary　I-phase,　the　particle-stimulated　nucleation　(PSN)　of　recrystallization　was　activated.　It　was　suggested　that　the　recrystallization　via　PSN　should　lead　to　the　nucleation　of　new　grains　with　a　high　orientation　mismatch　to　the　parent　grains,　making　the　texture　gradually　weaken.　Significant　strengthening　is　achieved　in　the　Mg-9Zn-1.5Er　alloy,　of　which　the　ultimate　tensile　strength　(sigma(b))　and　the　yield　tensile　strength　(sigma(0.2))　were　319　MPa　and　192　MPa,　respectively,　with　an　elongation　of　22.3%.　(C)　2013　Elsevier　B.V.　All　rights　reserved.