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利用复合铸造和振动斜板铸造2种方法铸造Si Cp增强A356复合材料,比较2种复合材料中碳化硅含量对材料显微组织、孔隙、硬度和耐磨性的影响。在铸态条件下,振动斜板铸造和复合铸造的2种复合材料的基体分别为球形和枝晶结构。振动斜板铸造的复合材料其碳化硅颗粒分布更加均匀,并且具有更高的硬度,复合铸造的材料则具有更少的孔隙。对于这2种复合材料,碳化硅颗粒的增加(体积分数最大为20%)导致碳化硅颗粒在基体合金内更加均匀分布并且提高了其耐磨性。与复合铸造材料相比,对于振动斜板铸造的复合材料,碳化硅含量的增加,将降低球形颗粒的尺寸和形状因子,并且具有较好的耐磨性。振动斜板铸造材料比复合铸造材料具有更好的力学性能,这是因为基体中的碳化硅颗粒分布更加均匀,而且振动斜板铸造过程中形成了球形组织。
The effects of silicon carbide content on the microstructure, porosity, hardness and wear resistance of the composites were compared by casting Si Cp-reinforced A356 composites by composite casting and vibrating swash plate casting. Under the condition of as-cast, the matrix of the two kinds of composite materials of the vibration inclined plate casting and compound casting are spherical and dendritic structures, respectively. Vibrated swash plate-cast composites have more uniform distribution of silicon carbide particles and higher hardness, while composite castings have fewer pores. For both composites, the increase in silicon carbide particles (up to 20% volume fraction) results in a more uniform distribution of silicon carbide particles within the matrix alloy and an increase in its wear resistance. Compared with the composite casting material, the increase of the silicon carbide content in the vibrating swash plate cast composite will reduce the size and shape factor of the spherical particles and has better wear resistance. Vibrating swash plate castings have better mechanical properties than composite castings due to the more uniform distribution of the SiC particles in the matrix and the formation of spherical structures during vibratory swash plate casting.