Study on Mechanical Properties and Fracture Mechanisms of B4 C-CeB6/Al Composites

摘要

B4C-CeB6/Al composites were first fabricated by pressureless infiltration technology. The mechanical properties of B4C-CeB6/Al composites were tested. The results show that the density, the flexibility strength and the fracture toughness of B4C-CeB6/Al composites were greatly improved compared with those of monolithic boron carbide, but the hardness of it decreased. The analysis of B4C-CeB6/Al composites by using the fracture scanning electric microscope and the backscattering equipment showed that, the fracture way of B4C-CeB6/Al composites was intercrystalline rupture. The flexibility strength and the fracture toughness of B4C-CeB6/Al composites were greatly improved for two major reasons. Firstly the flexibility strength and the fracture toughness of B4C-CeB6 porous perform were improved because for the CeB6 existing.Secondly the ductility of aluminum was manifested in B4C-CeB6/Al composites.