(南昌航空大學(xué) 輕合金加工科學(xué)與技術(shù)國防重點(diǎn)學(xué)科實(shí)驗(yàn)室，南昌 330063)
摘 要: 采用真空壓力浸滲法制備纖維體積分?jǐn)?shù)為47.5%的疊層穿刺結(jié)構(gòu)Cf/Al復(fù)合材料，主要研究復(fù)合材料的顯微組織以及彎曲性能，并進(jìn)一步分析復(fù)合材料的彎曲失效機(jī)理。結(jié)果表明：復(fù)合材料的致密度為95.0%，經(jīng)、緯向顯微組織均存在少量微孔缺陷，且緯向顯微組織的微孔缺陷較經(jīng)向顯微組織要多。疊層穿刺結(jié)構(gòu)Cf/Al復(fù)合材料的彎曲強(qiáng)度和模量分別為327 MPa和114 GPa，內(nèi)側(cè)面受壓處，基體出現(xiàn)團(tuán)簇，經(jīng)向纖維束由于屈曲變形程度大導(dǎo)致被壓斷，緯向纖維束發(fā)生相應(yīng)地?cái)D壓變形，而在外側(cè)面受拉處復(fù)合材料被拉伸破壞，造成基體開裂。
關(guān)鍵字: 疊層穿刺結(jié)構(gòu)；Cf/Al復(fù)合材料；顯微組織；彎曲性能；失效機(jī)理
（National Defence Key Discipline Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, China）
Abstract:Laminated puncture structural Cf/Al composites with 47.5% fiber volume fraction were fabricated by vacuum pressure infiltration. The microstructure and bending properties of the composites were studied, and the bending failure mechanism of the composites was further analyzed. The results indicate that the density of the composites is 95.0%, and there are a few micvoids defects in the warp and weft microstructure, and the micvoids defects in the weft microstructure are more than those in the warp microstructure. The bending strength and modulus of laminated puncture structural Cf/Al composites are 327 MPa and 114 GPa, respectively. In the compression area of the inner side, the matrix appears clusters, the warp fiber bundles are compressed fracture due to the large degree of buckling deformation, and the weft fiber bundles are corresponding extrusion deformation. While the composites of the outer side are damaged by tensile, which results in the matrix cracking.
Key words: laminated puncture structural; Cf/Al composites; microstructure; bending property; failure mechanism
