Fabrication, interfacial characterization and mechanical properties of continuous Al_2O_3 ceramic fiber reinforced Ti/Al_3Ti metal-intermetallic laminated (CCFR-MIL) composite

摘要

Continuous Al_2O_3 ceramic fiber reinforced Ti/Al_3Ti metal-intermetallic laminated (CCFR-MIL) composite was fabricated using a vacuum hot pressing (VHP) sintering method and followed by hot isostatic pressing (HIP). The microstructure characteristics of the interfaces between Ti and Al_3Ti, as well as Al_2O_3 fiber and Al_3Ti intermetallic were analyzed by scanning electron microscopy (SEM). Elemental distribution in the interfacial reaction zones were quantitatively examined by energy-dispersive spectroscopy (EDS). The phases in the composite were identified by X-ray diffractometer (XRD). The mechanical properties of the CCFR-MIL composite were measured using compression and tensile tests under quasi-static strain rate. The experimental results indicated that the residual Al was found in Al_3 Ti intermetallic layer of CCFR-MIL composite. The interfacial reactions occurred during HIP and the reaction products were determined to be Al_2Ti, TiSi_2, TiO_2 and Al_2SiO_5 phases. Compared to Ti/Al_3Ti MIL composite without fiber reinforcement, both the strength and failure strain of CCFR-MIL composite under both compressive and tensile stress states increased due to the contribution of the continuous ceramic Al_2O_3 fiber.