Nano-Ti5Si3 leading to enhancement of oxidation resistance. (1st August 2018)

• Record Type: Journal Article
• Authors: Jiao, Y.; Huang, L.J.; Wei, S.L.; Geng, L.; Qian, M.F.; Yue, S.
• Is Part Of: Corrosion science. Volume 140(2018)
• Page Start: 223
• Page End: 230
• Publication Date: 2018-08-01
• Subjects: Titanium alloys -- Titanium matrix composites -- Nano-Ti5Si3 -- Oxidation behaviors -- Anti-oxidation mechanisms; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2018.05.043
• Languages: English
• ISSNs: 0010-938X

Abstract

Graphical abstract: Highlights: Nano-Ti5 Si3 led to remarkable enhancement of oxidation resistance of composites. The oxidation rate of composites decreased with increasing Ti5 Si3 fractions. Nano-Ti5 Si3 was beneficial to forming a scale of mixed Al2 O3 and SiO2 . Nano-Ti5 Si3 could lead to refinement of TiO2 particles. Oxide scale was fastened by hierarchical microstructure. Abstract: Nano-Ti5 Si3 particles were formed via solution and precipitation, which drastically increased mechanical properties of (Ti5 Si3 +TiBw)/Ti6Al4V composites. In the present work, compared with Ti6Al4V alloy at 700 and 800 °C, nano-Ti5 Si3 particles led to remarkable enhancement of oxidation resistance, which increased with increasing Ti5 Si3 fractions. The contributions of nano-Ti5 Si3 particles were in two aspects: 1) were beneficial to forming dense and thin scale of mixed Al2 O3 and SiO2, which suppressed oxygen from permeating into matrix; 2) resulted in refinement of TiO2 particles, which could enhance the toughness and relative density of oxide scale. The two-level hierarchical microstructure also stabilized oxide scale.