(1. 南昌航空大學 輕合金加工科學與技術(shù)國防重點學科實驗室，南昌 330063；
2. 中國航發(fā) 北京航空材料研究院，北京 100095)
摘 要: 以M40J碳纖維的2.5D淺交直聯(lián)編織預制體為增強體，ZL301合金為基體材料，采用真空壓力浸滲法，制備纖維體積分數(shù)50%的2.5D碳纖維增強鋁基復合材料；研究2.5D淺交直聯(lián)結(jié)構(gòu)復合材料的致密度和微觀組織，在室溫、350 ℃和400 ℃環(huán)境下進行經(jīng)向拉伸力學性能測試并分析其變形斷裂行為。結(jié)果表明：2.5D復合材料的致密度較高達到96.2%，細觀結(jié)構(gòu)完整，纖維排布均勻，微觀組織無明顯鑄造缺陷，界面上大多數(shù)區(qū)域較為干凈，存在棒狀的Al4C3界面相；2.5D-Cf/Al的室溫、350 ℃和400 ℃的經(jīng)向拉伸強度分別為531、451和408 MPa，材料的高溫強度損失率僅為23%；其應力-應變曲線呈現(xiàn)明顯非線性特征，復合材料的室溫和高溫拉伸斷裂過程可以分為3個階段，即基體承載階段、纖維承載階段、損傷與斷裂階段。
關鍵字: Cf/Al復合材料；2.5D淺交直聯(lián)織物；真空壓力浸滲；高溫力學性能；斷裂行為
（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
