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采用XRD-7000型X射线衍射仪、扫描电镜(SEM)探析了铸态下Mg-4Si-xSb(x=0.2,0.3,0.4,0.5)合金相的组成与组织形貌;采用场发射(FESEM)分析了不同含量的Sb元素对Mg2Si颗粒几何形态的影响。结果表明:铸态下,Mg-4Si-xSb由α-Mg、Mg2Si、Mg3Sb2组成。随着Sb元素的增加,Mg2Si相由不规则的多边形结构转变为规则的正六边形结构。由场发射可以观察到,在Mg-4Si-xSb合金中,当Sb元素的含量为0.2%~0.4%时,部分Mg2Si相由不规则的阶梯状相转变为球状相;并且,随着Sb含量的增加,球状Mg2Si相的数量也在增加;当Sb元素的含量为0.5%时,球状Mg2Si相的形貌转变为正八面体结构。
The composition and microstructure of the as-cast Mg-4Si-xSb (x = 0.2,0.3,0.4,0.5) alloy phase were investigated by XRD-7000 X-ray diffraction and scanning electron microscopy (SEM) ) Analyzed the different content of Sb element Mg2Si particle geometry impact. The results show that Mg-4Si-xSb consists of α-Mg, Mg2Si and Mg3Sb2 in the as-cast state. With the increase of Sb element, Mg2Si phase changes from irregular polygon structure to regular hexagonal structure. From the field emission, it can be observed that in the Mg-4Si-xSb alloy, when the content of Sb is 0.2% ~ 0.4%, part of the Mg2Si phase transforms from the irregular stepped phase to the spherical phase; and as the Sb content The number of spherical Mg2Si phase is also increasing. When the content of Sb element is 0.5%, the morphology of spherical Mg2Si phase changes to the regular octahedron structure.