Microstructure and mechanical properties of deformed Mg–Mn–Sn alloys

Abstract

The microstructure and age hardening response of deformed Mg-1.5Mn-xSn (x = 1 and 5, wt.%) alloys under three different aging temperatures (100°C, 150°C, 200°C) have been investigated. The aging behavior and the mechanical properties are improved by increasing Sn content. On ther other hand, the pre-rolling process is an effective method to improve the age hardening response, and therefore the mechanical properties of ERA (extruded + rolled + aging treatment) state alloys are improved compared with those of EA (extrusion + aging treatment) state samples. The improved mechanical properties of ERA alloys are mainly related to the extensive twins and dislocations formed during the extrusion/rolling processes and Mg2Sn precipitates formed in the aging treatment.