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The Oxidation Behavior of Titanium Aluminum Alloys in Oxygen-enriched Environment

MATERIALS CHINA[ISSN:1674-3962/CN:61-1473/TG]

Issue:
2026年08
Page:
40-49
Research Field:
Publishing date:

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Title:
The Oxidation Behavior of Titanium Aluminum Alloys in Oxygen-enriched Environment
Author(s):
Liang;  Junyue Chen;  Junxi Yang;  Tao Huang;  Xujie Cao;  Fa He Wu;  Liankui
School of Materials, Sun Yat-sen University, Shenzhen 518107, Guangdong, China
Keywords:
TiAl alloy;  oxygen-enriched service environment;  solvothermal fluorination treatment;  magnetron sputtering coating;  pre-oxidation
CLC:

PACS:
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DOI:
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Abstract:
TiAl alloys exhibit good potential for application in high-temperature aero-engine components. To enhance initial flame growth rates and subsequent combustion efficiency, oxygen-enriched intake technology is commonly adopted in aircraft. Research indicates that when O2 exceeds 30 vol%, combustion efficiency increases dramatically; however, system stability decreases, potentially leading to severe internal oxidation and oxide scale spallation in service alloys. Therefore, building upon previous investigations into solvothermal fluorination, the present study introduces a combined modification strategy that involves magnetron sputtering of an aluminum coating followed by pre-oxidation, aiming to overcome the protection limitations of single fluorination in TiAl alloys. The oxidation behavior of aluminum coating and pre-oxidation on the oxidation behavior was systematically investigated at 900?°C in a N2?40%O2 atmosphere. The phase composition, morphology, and interfacial structure of the oxide scales were characterized using XRD, SEM/EDS, and TEM. The results demonstrate that pure O2 pre-oxidation enables the formation of a highly pure and dense initial Al2O3 layer, effectively suppressing outward diffusion of Ti. The aluminum coating serves as an “Al reservoir”, continuously supplying Al during prolonged oxidation and significantly delaying the initiation and propagation of the Al-depleted zone in the substrate. Among the four conditions, the aluminized with pure O2 pre-oxidized sample exhibits optimal performance: no spallation occurs after 200?h of oxidation, the Ti content in the oxide scale remains below 2.5?at.%, and the Al-depleted Ti3Al transition layer ultimately reaches a thickness of only approximately 5?nm. This combined modification strategy provides a novel approach for the high-temperature structural protection of TiAl alloys under oxygen-enriched combustion conditions.

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Last Update: 2026-06-30