Abstract
Alloying elements Si and Ca were employed to the Mg-5Sn-0.5Sr alloy in order to improve the heat resistance properties of Mg alloys. Mg-5Sn-0.5Sr-xSi (x=1, 2) and Mg-5Sn-0.5Sr-ySi-0.5Ca (y=1, 2) alloys were fabricated using the pot resistance furnace under protection of N2+SF6 atmosphere. The phase constituent and microstructure of the as-cast alloys were analyzed by x-ray diffractometer (XRD), optical microscopy (OM) and scanning electron microscopy (SEM) respectively. The results show that the Mg2Sn phase, Mg2Si phase precipitate on the grain boundary during eutectic reactions and MgSnSr phase inside the grains as primary phase for as-cast Mg-5Sn-0.5Sr-xSi (x=1, 2) alloys, the volume fractions of Mg2Si phase increases with the increasing of Si element. For Mg-5Sn-0.5Sr-ySi-0.5Ca (y=1, 2) alloys, furthermore, the addition of Ca element can promote significantly the formation of primary (Ca, Sr)MgSn phases, inhibit the precipitation of Mg2Sn phase on the grain boundary. Both Ca and Sr additions can refine the Mg2Si phase.
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