2.5D-Cf/Al复合材料的经向高温力学性能及其变形断裂行为  

High temperature mechanical properties and deformation fracture behavior in warp direction of 2.5-Cf/Al composites

作　　者：胡银生 余欢 徐志锋 王振军 王雅娜 HU Yin-sheng;YU Huan;XU Zhi-feng;WANG Zhen-jun;WANG Ya-na(National Defence Key Discipline Laboratory of Light Alloy Processing Science and Technology,Nanchang Hangkong University,Nanchang 330063,China;Beijing Institute of Aeronautical Materials,Aviation Industry Corporation of China,Ltd.,Beijing 100095,China)

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 [2]中国航发北京航空材料研究院,北京100095

出　　处：《中国有色金属学报》2020年第3期507-517,共11页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51765045,51365043);江西省自然科学基金资助项目(20151BAB206004)。

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。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.

关 键 词：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 

分 类 号：TB331[一般工业技术—材料科学与工程]