Nano-Ti5Si3 leading to enhancement of oxidation resistance

Abstract Nano-Ti 5 Si 3 particles were formed via solution and precipitation, which drastically increased mechanical properties of (Ti 5 Si 3 +TiBw)/Ti6Al4V composites. In the present work, compared with Ti6Al4V alloy at 700 and 800 °C, nano-Ti 5 Si 3 particles led to remarkable enhancement of oxidation resistance, which increased with increasing Ti 5 Si 3 fractions. The contributions of nano-Ti 5 Si 3 particles were in two aspects: 1) were beneficial to forming dense and thin scale of mixed Al 2 O 3 and SiO 2 , which suppressed oxygen from permeating into matrix; 2) resulted in refinement of TiO 2 particles, which could enhance the toughness and relative density of oxide scale. The two-level hierarchical microstructure also stabilized oxide scale.