Improving room temperature formability of twin-roll cast Mg-Al-Zn-Sn alloy by repeated bending

Abstract. A twin-roll cast Mg-9mass%Al-1 mass%Zn-2mass%Sn alloy was used for the purpose of fabricating for wrought magnesium alloy which can be bent in the room temperature. An appropriate solution annealing time was found in order to reduce beta phase precipitation, which may cause cracking without coarsening of crystal grain size while for improving cold formability of twin-roll cast Mg-9mass%Al-1 mass%Zn-2 mass%Sn alloy. After solution heat treatment of the twin-roll casting of the material, repeated bending by three rolls of the solution heat treated strip was performed in order to examine of bendability of the materials. It has been clarified that repeatedly bending and reverse bending after solution heat treatment were effective for improving formability of the Mg-9mass%Al-1 mass%Zn-2 mass% Sn alloy at room temperature.