Oxidation–nitridation-induced recrystallization in a near-α titanium alloy. (5th January 2018)

• Record Type: Journal Article
• Authors: Kitashima, Tomonori; Hara, Toru; Yang, Yang; Hara, Yuka
• Is Part Of: Materials & design. Volume 137(2018)
• Page Start: 355
• Page End: 360
• Publication Date: 2018-01-05
• Subjects: Oxidation -- Ti alloy -- Recrystallization -- Nitrogen; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2017.10.043
• Languages: English
• ISSNs: 0264-1275

Abstract

Highlights: Recrystallization at the oxide–metal interface in a titanium alloy was caused by the formation of nitrides during oxidation. Before the recrystallization at the interface, nitrogen dissolved in the substrate, and a nitrogen-rich layer formed near the interface. The oxygen concentration was lower in the recrystallized grains compared with that in the nonrecrystallized grains. Graphical abstract: Abstract: The oxidation resistance of titanium alloys is an important property for high-temperature applications. Here, the oxidation–nitridation-induced recrystallization at the oxide–metal interface of a near-α titanium alloy substrate was analyzed using electron-backscatter diffraction and scanning transmission electron microscopy after oxidation tests at 750 °C for 500 h in air. Oxidation–nitridation-induced recrystallization was promoted by the enrichment of nitrogen at the interface, and grains comprising Ti2 N and Ti3 AlN grew from the interface with the inhomogeneous distribution of nitrogen.