(南昌航空大学 轻合金加工科学与技术国防重点学科实验室，南昌 330063)
摘 要: 选用的增强体为先驱体法制备的束丝SiC纤维(KD-Ⅱ型)，采用真空气压浸渗法制备体积分数为40%、基体合金分别为ZL102、ZL114A及ZL205A合金的连续SiCf/Al复合材料，并用NaOH溶液萃取出SiC纤维，研究基体合金对连续SiCf/Al复合材料微观组织和拉伸强度的影响。结果表明：基体合金对连续SiCf/Al复合材料的微观组织及力学性能有显著地影响。其中，SiCf/ZL102复合材料纤维分散均匀和致密，SiCf/ZL114A复合材料存在少量的纤维团聚，而SiCf/ZL205A复合材料存在明显的偏聚和微孔缺陷；基体ZL102、ZL114A及ZL205A复合材料的平均拉伸强度分别为615.7、475.9和385.1 MPa，差别较大；同时，从基体ZL102、ZL114A及ZL205A的复合材料中萃取出SiC纤维的平均拉伸强度分别为原丝的50.94%、41.51%及25.09%；在浸渗过程中，纤维损伤和分布是导致不同基体复合材料力学性能差异的关键因素。
关键字: 真空气压浸渗；萃取纤维；SiC纤维；拉伸强度
（National Defence Key Discipline Laboratory of Light Alloy Processing Science and Technology,
Nanchang Hangkong University, Nanchang 330063, China）
Abstract:The vacuum gas pressure infiltration was performed for the continuous SiCf/Al composite with the volume fraction of 40%, of which the reinforced material was SiC fiber fabricated by precursor method, the matrix alloys were ZL102, ZL114A and ZL205A alloys, SiC fibers were extracted using NaOH solution, both the effects of matrix alloy on the microstructure and tensile strength of continuous SiCf/Al composites were studied. The results show that matrix alloy has a significant effect on the microstructure and mechanical properties of continuous SiCf/Al composites. Fibers of SiCf/ZL102 composite are uniformly dispersed and dense, SiCf/ZL114A composites have small amounts of fiber reunion, but SiCf/ZL205A composites have obvious segregation and microporous defects. Average tensile strengths of the composites with matrix of ZL102, ZL114A and ZL205A are 615.7, 475.9 and 385.1 MPa, respectively, which are quite different. Meanwhile, average tensile strength of SiC fibers extracted from composites with matrix of ZL102, ZL114A and ZL205A are 50.94%, 41.51% and 25.09% of the raw silk, respectively. In the infiltration process, fiber damage and fiber distribution are the key factors leading to differences in composite mechanical properties of the different matrix.
Key words: vacuum gas pressure impregnation; extracted fibers; SiC fiber; tensile strength
