摘要
利用箔-纤维-箔(FFF)法结合真空热压(VHP)技术制备新型的Cf增强Ti/Al基层状复合材料。借助扫描电镜(SEM)、能谱(EDS)分析、X射线物衍射物相分析(XRD)测试、弯曲实验、压缩实验等对不同热压工艺参数下材料的组织及性能进行研究。结果表明,最佳热压工艺为700℃/30 MPa/1 h,材料抗弯曲强度可达469 MPa,抗压强度可达324 MPa。新型Cf增强Ti/Al基层状复合材料结构为韧-脆相交替的叠层,该结构可有效阻碍裂纹扩展并延长其扩展路径,吸收大量的断裂能,以此提高材料的性能。在Ti/Al界面处生成Al3Ti和Ti5Si3强化相;在Al/Cf界面处形成了Al4C3和SiC相。Si元素促进Ti、Al结合及强化相Ti5Si3的析出,并提高Al、C润湿性。
Cf reinforced Ti/Al-based layered composites were prepared by the foil-fiber-foil(FFF)method combined with vacuum hot pressing(VHP)technology.Scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),X-ray diffraction phase analysis(XRD),bending test,and compression test were implemented to explore the microstructure and properties of the materials under different hot pressing parameters.The results show that the optimum parameters of hot-pressing process are 700°C/30 MPa/1 h.The bending strength and compressive strength of the material can reach 469 and 324 MPa,respectively.The material structure is a stack of tough and brittle phases.This structure can effectively impede crack propagation and extension of the crack path,and absorb a large amount of fracture energy,thereby improving the performance of the material.Al3Ti and Ti5Si3 phases are formed at the Ti/Al interface,and Al4C3 and SiC phases are formed at the Al/Cf interface.Si element promotes the bonding of Ti and Al,and the precipitation of the strengthening phase Ti5Si3,and improves the wettability between Al and C.
作者
唐迎春
罗磊
骆良顺
韩宝帅
苏彦庆
郭景杰
傅恒志
Tang Yingchun;Luo Lei;Luo Liangshun;Han Baoshuai;Su Yanqing;Guo Jingjie;Fu Hengzhi(National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology,Harbin 150001,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2019年第11期3693-3700,共8页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51671073)
国家重点研究发展计划(2016YFB0301201)
