Microstructure and Mechanical Properties of In-situ Synthesized Discontinuous Particles Reinforced Titanium Matrix Composite

Titanium matrix composites reinforced with three reinforcements of 1vol%La₂O₃,5vol%TiB+1vol%La₂O₃ and 5vol%TiC+1vol%La₂O₃, respectively, were prepared by in-situ reactions with sponge titanium, lanthanum powder, titanium diboride powder and graphite powder as raw materials. The microstructure and mechanical properties of the composites were studied and compared with those of pure titanium prepared by the same process. The results show that the matrix microstructure of the composites consisted of α-Ti. The in-situ synthesized La₂O₃ was granular or short-rob like, the TiB was short-fiber like and distributed along the forging direction, and the TiC was equiaxed or irregular shape. The hardness, tensile strength and yield strength of the obtained titanium matrix composites were higher than those of the pure titanium, while the elongation was lower than that of the pure titanium.