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通过搅拌铸造制备SiC纳米颗粒增强A356铝合金复合材料,并研究其显微组织和力学性能。密度测量发现试样的孔隙度较低,且孔隙度随SiC颗粒体积分数的增加而增加。通过光学显微镜和透射电镜观察材料的显微组织,发现弥散的颗粒分布均匀。材料的拉伸强度和弹性模量随加入纳米SiC颗粒的增加而提高,而延展性有所降低。当SiC纳米颗粒的加入量为3.5%时,复合材料的屈服强度和极限抗拉强度达到最高。断口分析表明,拉伸断裂试样为相对韧性断裂。
SiC nano-particles reinforced A356 aluminum alloy composites were prepared by stirring casting and the microstructure and mechanical properties were studied. The density measurement shows that the porosity of the sample is low, and the porosity increases with the increase of SiC particle volume fraction. Through optical microscope and transmission electron microscope observation of the material microstructure and found that the dispersed particles are evenly distributed. The tensile strength and elastic modulus of the materials increase with the addition of nano-SiC particles, while the ductility decreases. When the amount of SiC nano-particles is 3.5%, the yield strength and ultimate tensile strength of the composites reach the highest. Fracture analysis shows that the tensile fracture specimen is relatively ductile fracture.