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.
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)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
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)。
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
Cf/Al composity
2.5D shallow-straight joint woven
vacuum pressure infiltration
high temperature mechanical properties
fracture behavior
