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In this work, a high strength-ductility Ti64 cast alloy, containing trace TiC-TiB 2 nanoparticles, was fabricated by adding dual-phased nano-TiC-TiB 2 /Al master alloys to the molten Ti64 alloys. The trace addition of the TiC-TiB 2 nanoparticles (0.1 wt%) simultaneously reduced the size of the β grains, the α laths, and the α colony size of the lamellar structure during casting and suppressed the coarsening of the α laths during heat treatment. The yield strength and the uniform elongation of TiC-TiB 2 /Ti64 were increased by ~130 MPa and 2%, respectively. The simultaneously improved strength and ductility of the TiC-TiB 2 /Ti64 were attributed to the decrease in the α colony size of the lamellar structure, the significant refinement of the grains and α laths, and the pinning effect of nanoparticles.

Improved Strength-Ductility of Ti-6Al-4V Casting Alloys with Trace Addition of TiC-TiB2 Nanoparticles