(石家庄铁道学院材料科学与工程研究所, 石家庄 050043)
摘 要: 通过对采用半固态搅拌-液态模锻工艺制备的SiCp/Al合金基复合材料室温拉伸性能的研究，分析了这种复合材料屈服强度和极限强度提高的原因，对颗粒增强复合材料的强化机理进行了探讨；同时，采用扫描电子显微镜对材料的拉伸断口进行了观察，发现复合材料及未增强基体合金的断裂虽均属于塑性断裂与脆性断裂的混合型模式，但随着SiC颗粒在复合材料中的体积分数的增加，脆性断裂特征变得更为显著。
关键字: SiCp/Al合金基复合材料 拉伸性能 断口形貌
（The Institute of Materials Science and Engineering,
Shijiazhuang Railway Institute, Shijiazhuang 050043, P. R. China）
Abstract:The room temperature tensile properties of SiCp/Al alloy composites, which were fabricated by semisolid slurry-stirring and squeeze-casting, were investigated. The reasons for increasing the yield strength and ultimate tensile strength of the composites were analyzed. The fracture morphology of tensile test bars was studied with scanning electron microscope. The SEM fractographic observations of the tested bars showed that the failure of both the composites and the unreinforced matrix-alloy is of mixed mode of ductile fracture and brittle fracture, while the morphologic features of brittle fractures get more dominant with the increase of SiC particles in composites.
Key words: SiCp/Al alloy composites; tensile properties; fracture morphology
