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The microstructure and mechanical properties of TiB_2 /B_4C composites have been investi-gated.It was found that both the strength and hardness for TiB_2 greatly increase with the ad-dition of 20 to 30 wt-% B_4C,and the fracture toughness K_(IC) value remaines on the originalhigh level.The flexure strength,Vicker’s hardness and fracture toughness are 782 MPa,26.2GPa and 7.2 MPam~(1/2),respectively,for the TiB_2-30 wt-% B_4C composite,compared to450 MPa,21 GPa and 7.0 MPam~(1/2) for monolithic TiB_2.The toughening and strengtheningmechanisms,have also been discussed.
The microstructure and mechanical properties of TiB_2 / B_4C composites have been instisti- gated. It was found that both both strength and hardness for TiB_2 greatly increase with the ad-dition of 20 to 30 wt-% B_4C, and the fracture toughness K_ (IC ) value remaines on the original high level. flexural strength, Vicker’s hardness and fracture toughness are 782 MPa, 26.2 GPa and 7.2 MPam ~ (1/2), respectively, for the TiB_2-30 wt-% B_4C composite, compared to 450 MPa, 21 GPa and 7.0 MPam ~ (1/2) for monolithic TiB_2. The toughening and strengthening mechanisms, have also been discussed.