As cast microstructure and mechanical properties of Mg–6Al–1Zn–0·7Si magnesium alloys modified by Sn and Sr additions

Abstract

The as cast microstructure and mechanical properties of Mg-6Al-1Zn-0?7Si (wt-%) alloys modified by Sn and Sr additions are investigated and compared. The results indicate that adding 0?56 wt-%Sn to Mg-6Al-1Zn-0?7Si can refine the Chinese script shaped Mg 2 Si phase in the alloy, but the modification of the Mg 2 Si phase is not obvious. Oppositely, adding 0?027-0?086 wt-%Sr can effectively refine and modify the Chinese script shaped Mg 2 Si phase in the Mg-6Al-1Zn-0?7Si alloy. After adding 0?027-0?086 wt-%Sr, the morphology of the Mg 2 Si phase in the Mg-6Al-1Zn-0?7Si alloy changes from coarse Chinese script shape to fine granule and/or irregular polygonal shapes. Accordingly, the Sr containing alloys obtain the relatively higher tensile and creep properties than the Sn containing alloy. The difference of Sn and Sr additions in the modification and refinement of the Chinese script shaped Mg 2 Si phase in the Mg-6Al-1Zn-0?7Si alloy is possibly related to the different effects of the two elements on the undercooling degree.

Mechanical Property of Magnesium Alloy Surface with Dense Oxide

“…Generally, using low-density light materials with a high strength/stiffness-to-weight ratio is an effective step toward this goal. Magnesium alloys of light metals have attracted much attention as a structural material because of their excellent light weight and high mechanical properties [1][2][3]. In the present work, we formed AZCa912 continuous casting bars and measured their compressive properties [4][5][6].…”