摘要
采用真空蒸镀法对SiC颗粒(SiCp)表面进行镀Ti改性改善SiCp/Al复合材料界面结合,采用热压、挤压和热处理等方法制备镀Ti后SiCp和原始SiCp增强的Al 2519基复合材料。通过扫描电镜(SEM)和能谱仪(EDS)分析Ti镀层对复合材料组织与性能的影响。结果表明,致密沉积的Ti镀层与SiCp反应,在界面处形成TiC和Ti5Si3相;与用原始SiCp增强的复合材料相比,用Ti镀覆SiCp增强的复合材料表现出均匀且致密的显微组织且复合材料的相对密度和力学性能得到显著改善。体积分数为15%时,镀Ti后SiCp增强Al 2519复合材料的硬度、断裂应变和拉伸强度达到最优,分别为HB 138.5、4.02%和455 MPa。
Ti-coated SiCp particles were developed by vacuum evaporation with Ti to improve the interfacial bonding of SiCp/Al composites.Ti-coated SiC particles and uncoated SiC particles reinforced Al 2519 matrix composites were prepared by hot pressing,hot extrusion and heat treatment.The influence of Ti coating on microstructure and mechanical properties of the composites was analyzed by scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS).The results show that the densely deposited Ti coating reacts with SiC particles to form TiC and Ti5Si3 phases at the interface.Ti-coated SiC particle reinforced composite exhibits uniformity and compactness compared to the composite reinforced with uncoated SiC particles.The microstructure,relative density and mechanical properties of the composite are significantly improved.When the volume fraction is 15%,the hardness,fracture strain and tensile strength of the SiCp reinforced Al 2519 composite after Ti plating are optimized,which are HB 138.5,4.02%and 455 MPa,respectively.
作者
董翠鸽
崔蕊
王日初
彭超群
蔡志勇
Cui-ge DONG;Rui CUI;Ri-chu WANG;Chao-qun PENG;Zhi-yong CAI(School of Materials Science and Engineering,Central South University,Changsha 410083,China)
基金
Project(CXZZ20140506150310438)supported by the Science and Technology Program of Shenzhen,China
Project(2017GK2261)supported by the Science and Technology Program of Hunan Province,China
Project(2017zzts111)supported by the Fundamental Research Funds for the Central Universities of Central South University,China。
