《Table 2:EDS results of phases in as-cast Mg-5Sn-1Si alloy (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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Figure 1 presents the XRD pattern of the Mg-5Sn-1Si alloy.It indicates that this alloy consists ofα-Mg，Mg2Si and Mg2Sn phases.The corresponding SEM images of the as-cast Mg-5Sn-1Si alloy are presented in Fig.2.It can be observed that the matrix of the alloy isα-Mg solid solution and the others are secondary phases with different morphologies which spread on the matrix and inter-dendritic regions.The inter-dendrite compounds have two morphologies:one is in Chinese script and another in irregular-shape which is abnormal eutectic phase.Combining the EDS（Table 2）and XRD results，it can be proved that the abnormal eutectic compounds（Point l in Fig.2)which enrich in Mg and Sn and minor Si elements are Mg2Sn phase.The compound in Chinese script morphology which locates at the grain boundary has the typical characteristics of Mg2Si phase.EDS results show that the compound at the boundries of Mg2Si phase is much different from the main part of the Mg2Si.It contains a certain amount of Sn element，so it is a new phase Mg2（SixSn1-x）.Therefore，the as-cast Mg-5Sn-1Si alloy consists ofα-Mg，abnormal eutectic Mg2Sn phase，Chinese-character Mg2Si phase at grain boundaries，and some ternary Mg2（SixSn1-x）compounds as well.The ternary Mg2(SixSn1-x） compound is at the boundaries of the Mg2Si phase.Under low solidification rate，the Mg2Si phase tends to grow into the Chinese script form in Mg-5Sn-1Si alloy，which is detrimental to the mechanical properties of the alloys.