Effect of TiB+TiC Content on Microstructure and Mechanical Properties of Forged Titanium Matrix Composites
The titanium matrix composites were prepared by vacuum consumable arc melting,free forging+rotary forging,and the effect of TiB+TiC content on the microstructure and mechanical properties of forged titanium matrix composite materials were studied.The results indicate that the added B4C reacts completely within the matrix,resulting in TiC as the sole carbide and TiB as the sole boride.After forging,the transverse microstructure of the composite exhibits spherical and flaky α phase which surrounded by β phase,with discretely distributed short rod-like and blocky reinforcing phases.The longitudinal structure consists of elongated α phase and β phase along the rheological direction,with the enhanced phase distributed in the same direction.When the content of TiB+TiC is 5vol%,the titanium matrix composite showing excellent comprehensive properties,with tensile strength of 1291 MPa and elongation of 8.5%,and the wear volume is reduced by 25%compared with that of TC4 titanium alloy prepared by the same process.If the content of TiB+TiC is further increased,the number of TiB reinforcing phase and microporous defects in the composite is greatly increased,which weakens the plasticity and wear resistance of the composite.
TC4 titanium alloytitanium matrix compositesmicrostructuretensile propertyfriction and wear
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