Network-Architectured DRTMCs via DED: Achieving Strength–Ductility Synergy through In-Situ Nano-Reinforcement
Discontinuously reinforced titanium matrix composites (DRTMCs) are gaining traction due to their impressive strength-ductility synergy, yet traditional fabrication routes suffer from scalability limits imposed by matrix powder size and inconsistent reinforcement distribution. Additive manufacturing, particularly directed energy deposition (DED), offers a promising solution but often struggles to balance strength and ductility. This study addresses these challenges by developing in-situ nano-reinforced DRTMCs with a quasi-continuous network architecture, fabricated using pure Ti and LaB₆ as starting materials. The objective is to enhance microstructural control, refine grains, and achieve superior mechanical performance. In-Situ Formation of Nano-Sized Reinforcements The integration of LaB₆ during DED processing enables the in-situ formation of nano-sized TiB and La₂O₃ reinforcements. These particles serve as potent nucleation and strengthening agents, promoting the development ...