Microstructure and Mechanical Properties of the Extruded and Aged Mg-6Al-2Sn-0.4Mn-xAg Alloys (x = 1, 2 and 3 mass%)

Abstract

In this study, Mg-6 mass%Al-2 mass%Sn-0.4 mass%Mn with different Ag addition (1, 2 and 3 mass%) were extruded and aged. The effects of Ag additions on microstructure and mechanical properties of the Mg-6Al-2Sn-0.4Mn-based alloys were investigated. In the case of the as-extruded alloys, the strength of Ag-containing alloys was improved approx. 330 MPa as compared with alloy without Ag, due to the solid solution strengthening and weaker basal texture by Ag addition. After ageing treatment, ultimate tensile strength of the 3 mass%Ag containing was remarkably improved to 382 MPa with elongation of 12%. It is probable that fine Mg-Ag precipitates in the α-Mg matrix after ageing treatment, played a significant role in the enhanced strength by Ag addition.