The　precipitation　hardening　and　recrystallization　behavior　of　Al-Mg-Er-Zr　alloys　have　been　investigated.　The　results　show　that　Mg　solute　and　its　concentration　has　negligible　influence　on　the　precipitation　of　Al-3(ErZr).　The　distribution　of　the　precipitates　is　inhomogeneous　due　to　the　inhomogeneous　distribution　of　the　solute　species　formed　during　solidification.　The　recrystallization　temperatures　of　the　alloys　with　addition　of　Er　and　Zr　are　higher　than　that　of　the　alloys　free　of　Er　and　Zr,　especially　the　recrystallization　end　temperature　of　the　Al-Mg-Er-Zr　alloy　which　is　at　least　200　degrees　C　higher　than　that　of　the　Al-5Mg　alloy　due　to　the　retardation　of　the　precipitates.　Recrystallization　of　Al-Mg-Er-Zr　alloys　initiates　at　the　precipitation　free　zone.　The　recrystallization　starting　temperatures　of　the　Al-Mg-Er-Zr　alloys　increase　with　the　decrease　of　the　Mg　concentration　due　to　high　deformation　energy　of　the　Al-Mg-Er-Zr　alloy　with　high　Mg　concentration,　and　the　recrystallization　end　temperatures　are　close　among　Al-Mg-Er-Zr　alloys　with　different　Mg　concentration.　(C)　2016　Elsevier　B.V.　All　rights　reserved.