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Different volume fraction of TiB, TiC and La 2 O 3  multiple-reinforced Ti6Al4V composites were fabricated by casting and followed by forging and hot extrusion. The microstructural evolution and mechanical behavior of (TiB+TiC+La 2 O 3 )/Ti6Al4V composites during hot extrusion were investigated. The microstructural observations showed that the TiB w  and TiC p  agglomeration disappeared and distributed more homogeneously in the Ti matrix after hot extrusion. Besides, TiB w  exhibited highly preferred alignment along the extrusion direction and TiC p  distributed along the same direction. Besides, two kinds of microstructure bands with distinctive spatial distributions of reinforcements were formed after hot extrusion: equiaxial bands embedded with fairly substantial reinforcements and finer basket-weave bands containing few reinforcements, in which the micron-scale TiB w , TiC p  and submicron-scale La 2 O 3  particle stimulating nucleation occurred and resulting dynamic recrystallization were the main mechanisms responsible for grain refinement. The tensile tests revealed that hot extrusion significantly increased elongation of (TiB+TiC+La 2 O 3 )/Ti6Al4V composites from 2.71% to 13.2% accompanied by slightly decreasing ultimate tensile strength from 954MPa to 903MPa, compared with that of the as-forged composites, which due to a complex process of reinforcements/matrix interaction during extrusion and dynamic recrystallization.

Multi-scale reinforcements stimulated dynamic recrystallization and mechanical behavior of as-extruded titanium matrix composites