(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；
2. 中国航发 北京航空材料研究院，北京 100095)
摘 要: 以M40J碳纤维的2.5D浅交直联编织预制体为增强体，ZL301合金为基体材料，采用真空压力浸渗法，制备纤维体积分数50%的2.5D碳纤维增强铝基复合材料；研究2.5D浅交直联结构复合材料的致密度和微观组织，在室温、350 ℃和400 ℃环境下进行经向拉伸力学性能测试并分析其变形断裂行为。结果表明：2.5D复合材料的致密度较高达到96.2%，细观结构完整，纤维排布均匀，微观组织无明显铸造缺陷，界面上大多数区域较为干净，存在棒状的Al4C3界面相；2.5D-Cf/Al的室温、350 ℃和400 ℃的经向拉伸强度分别为531、451和408 MPa，材料的高温强度损失率仅为23%；其应力-应变曲线呈现明显非线性特征，复合材料的室温和高温拉伸断裂过程可以分为3个阶段，即基体承载阶段、纤维承载阶段、损伤与断裂阶段。
关键字: Cf/Al复合材料；2.5D浅交直联织物；真空压力浸渗；高温力学性能；断裂行为
（1. National Defence Key Discipline Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, China;
2. Beijing Institute of Aeronautical Materials, Aviation Industry Corporation of China, Ltd., Beijing 100095, China）
Abstract:2.5D shallow-straight joint woven Cf/Al composites using M40 graphite fiber as reinforcement and ZL301 as matrix alloy was fabricated by the vacuum pressure infiltration method. The volume fraction of 2.5D shallow-straight joint woven Cf/Al composites is 50%. The density, microstructure and interfacial structure of 2.5D shallow-straight joint woven composites were studied, and the mechanical properties were tested at room temperature, 350 and 400 ℃ and the fracture morphology and deformation fracture behavior were analyzed. The results show that, the compactness of the composites reaches 96.2%, and the microstructure is complete, the fibers are evenly distributed, and there are no obvious casting defects in the microstructure. Most areas on the interface are relatively clean, there is a rod like Al4C3 phase on the interface. The tensile strength of 2.5D-Cf/Al at room temperature, 350 and 400 ℃ are 531, 451 and 408 MPa, respectively. The loss rate of high temperature strength is only 23% and its stress-strain curve is non-linear. The tensile fracture process of composites at room temperature and high temperature can be divided into three stages, matrix loading stage, fiber loading stage, damage and fracture stage.
Key words: Cf/Al composity; 2.5D shallow-straight joint woven; vacuum pressure infiltration; high temperature mechanical properties; fracture behavior
