基体合金对连续SiC_f/Al复合材料显微组织及拉伸强度的影响  

Effect of matrix alloy on microstructure and tensile strength of continuous SiC_f/Al composite

作　　者：徐志锋[1] 徐燕杰[1] 余欢[1] 王振军[1] 周珍珍[1] 

机构地区：[1]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

出　　处：《中国有色金属学报》2015年第2期392-400,共9页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51365043);航空科学基金资助项目(2011ZE56007);轻合金加工科学与技术国防重点学科实验室和航空材料热加工技术航空科技重点实验室联合资助项目(GF201101004)

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Na OH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。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/ZL 102 composite are uniformly dispersed and dense, SiCf/ZL 114A composites have small amounts of fiber reunion, but SiCiCZL205A composites have obvious segregation and microporous defects. Average tensile strengths of the composites with matrix of ZL 102, ZL 114A 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.

关 键 词：真空气压浸渗 萃取纤维 SIC纤维 拉伸强度 

分 类 号：TB333[一般工业技术—材料科学与工程]