《Table 1:Nominal compositions of experimental Mg-5Sn-1Si alloys (wt.%)》

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《"Microstructures and tensile properties of as-cast Mg-5Sn-1Si magnesium alloy modified with trace elements of Y, Bi, Sb and Sr"》

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The nominal compositions of Mg-5Sn-1Si based alloys used in this study are presented in Table 1.The investigated materials were prepared with a resistance furnace by melting pure Mg（>99.90%），Sn（>99.99%)，Bi （>99.99%），Sb （>99.99%）and master alloys of Mg-5.0%Si，Mg-10%Sr and Mg-30.0%Y in a steel crucible.Before melting，all of the raw materials were preheated to 120°C to remove the surface moisture.The pure Mg ingots were firstly put into the steel crucible and heated to 720°C with protection of mixture gas of 0.5vol.%SF6 and99.5vol.%CO2.When the pure Mg ingots were completely melted，the preheated Sn，Bi，Sb，Mg-30.0%Y，Mg-10%Sr and Mg-5.0%Si master alloys were respectively added into the Mg melt.Then the temperature was raised to 780°C and held for30 min to ensure the Mg-5.0%Si master alloy being completely melted.During holding period，the melts were stirred with a carbon bar for several times in order to melt the Mg-5.0%Si master alloy completely and make the compositions of the melts uniform.Then，the melts were cast into ingots with a diameter of 105 mm and a length of 450 mm.In order to analyze the microstructures of the alloys，the as-cast metallographic samples were prepared in accordance with the standard routines and etched with picric acid solution（5 g picric acid+10 mL glacial acetic+10 mL distilled water+80 mL anhydrous ethanol）for 5-10 s at room temperature.Microstructural analysis was conducted by using an optical microscope （OM，Olympus GX51）and a scanning electron microscope（SEM，JSM-6700F）equipped with an energy dispersive X-ray spectrometer(Oxford，Germany）.The phases of the alloys were analyzed by using X-Ray diffraction（XRD，Rigaku D/max-3C type，Japan)，the radiation source was Cu Kα，scanning step and range were 0.033°and 10°-90°，respectively.Thermal analysis by differential scanning calorimetry （DSC）were performed using a NETZSCH STA 2500 system.For the DSC tests，samples weighed around 20 mg were heated under flowing argon atmosphere from room temperature to 750°C.The heating curves were recorded at a controlling speed of 5°C·min-1.The tensile properties at room temperature were determined from the stress-strain curves.The 0.2%yield strength（YS），ultimate tensile strength (UTS）and elongation to failure were obtained based on the average results of three valid tests.